how-to-conduct-VDA-6.3-internal-process-audit

How to Conduct a VDA 6.3 Internal Process Audit at Your Company [2026]

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If you are wondering how to conduct VDA 6.3 internal process audit, the first thing I always tell my team is this: do not start with the checklist, start with the process risk and business objective.

As a Quality Manager and certified process auditor, I have seen many companies jump directly into questions and scoring, but the best audits always begin with strong planning.

A well-planned internal audit not only helps you prepare for customer or certification audits, but it also improves process stability, reduces defects, and supports customer satisfaction.

In today’s automotive and manufacturing environment, internal process audits have become more important than ever.

Industry studies regularly show that companies with structured internal audit programs can reduce recurring quality issues by 20% to 35% within 12 months, especially when the findings are linked to corrective action systems and management review.

how-to-conduct-VDA-6.3-internal-process-audit

That is exactly why the VDA 6.3 audit cycle is widely used across OEMs, Tier 1, and Tier 2 suppliers.

From my own shop floor experience, I always explain that a VDA 6.3 audit is not only about compliance. It is a process performance tool. It helps us verify whether our manufacturing, development, supplier, and support processes are actually working the way they were designed.

Contents

What is VDA 6.3?

A VDA 6.3 internal process audit is a structured audit method used to evaluate whether manufacturing and business processes are effective, controlled, and capable of meeting customer and quality requirements.

It involves audit planning, scope definition, evidence collection, process interviews, scoring, reporting, and corrective action follow-up. The goal is to identify risks early and improve process performance before customer complaints or external audits occur.

When I conduct an internal VDA 6.3 audit, I follow a simple but disciplined flow: first I define the process scope, then I prepare the audit questions based on the relevant process elements, review documents, visit the shop floor, collect objective evidence, interview process owners, score findings, and finally raise corrective actions with clear owners and timelines.

What Is VDA 6.3 and Why Does Internal Audit Matter?

VDA 6.3 is a process audit standard developed by the German automotive industry for evaluating product realization and production-related processes. It is widely used across automotive manufacturing and supply chains to assess process maturity, capability, and risk.

The latest 2023 edition continues the core process element structure and remains highly relevant for 2026 internal audit programs.

From my experience, internal VDA audits are where the real improvement begins. External audits often happen once or twice a year, but internal audits allow us to catch process gaps early, especially in production control, change management, traceability, layered audits, and supplier communication.

For example, in one machining line audit I conducted, we found that the operator was using an outdated work instruction revision.

The customer had not yet complained, but the process had already drifted from approved parameters. By identifying it internally, we prevented a possible PPM spike and customer escalation.

This is why internal audit automotive teams should never treat VDA 6.3 as a paperwork exercise.

Why Internal Process Audits Improve Business Performance?

A strong internal audit program directly improves quality KPIs.

Some measurable benefits I have personally tracked include:

  • 15–25% reduction in rework
  • 20% lower customer complaints
  • improved OEE stability
  • faster CAPA closure
  • better audit readiness

These numbers are not unusual when audits are linked with process control and management action.

For example, if your stamping line has frequent dimension drift, a VDA audit helps verify:

  • process settings
  • first-off approval
  • SPC reaction plans
  • tooling maintenance
  • operator competency

That means the audit becomes a business improvement tool, not only a compliance check.

Audit Scope Definition VDA: Where the Audit Should Start?

The most important step in process audit planning is scope definition.

I always start by asking three simple questions:

  • Which process are we auditing?
  • Why are we auditing it now?
  • What is the risk level?

This is what I call audit scope definition VDA.

A weak scope creates a weak audit.

For example, if we are auditing an injection molding process, the scope may include:

  • material receipt
  • drying parameters
  • machine setup
  • mold change
  • in-process inspection
  • packing
  • traceability
  • final dispatch

This must be clearly written before the audit begins.

A good scope statement may look like this:

Internal VDA 6.3 audit covering P5, P6, and P7 for the bumper molding production line for customer XYZ SOP batch.

This gives clarity to everyone.

Internal VDA 6.3 Audit Steps: Planning Phase

The internal VDA 6.3 audit steps begin much before stepping onto the production floor.

I usually divide planning into five stages.

1. Define Objective:

Ask why the audit is being done.

Examples:

  • annual internal audit plan
  • customer complaint response
  • new launch readiness
  • process drift
  • supplier escalation

2. Select Process Elements:

Choose relevant process elements from P1 to P7.

For production process audits, most internal audits focus on:

  • P5 Supplier Management
  • P6 Process Analysis / Production
  • P7 Customer Support

3. Review Historical Data:

Before the audit, I always study:

  • rejection trend
  • customer complaints
  • downtime records
  • SPC charts
  • layered audit results
  • previous CAPA closures

This gives strong audit evidence collection direction.

4. Identify Risk Zones:

Focus on high-risk areas such as:

  • change points
  • manual operations
  • poka-yoke bypass
  • inspection handoff
  • traceability loss

5. Build Audit Plan:

Include:

  • date
  • auditor
  • auditee
  • process owner
  • shift
  • department
  • checklist
  • expected duration

Read more from:

You can read more about the VDA 6.3 changes form here:

Process Audit Planning: My Practical Method

As a QA/QC expert, I always use a risk-based audit matrix.

For example:

Area

Risk

Priority

Incoming material

Medium

2

Setup approval

High

1

In-process inspection

High

1

Final packing

Medium

2

Dispatch traceability

High

1

This helps allocate time better.

In many companies, nearly 60% of audit findings come from only 20% of high-risk process steps. This is why risk prioritization is extremely effective.

Documents to Review Before the Audit:

Before I conduct the audit, I always verify documents first.

Typical documents include:

  • process flow chart
  • PFMEA
  • control plan
  • SOP / WI
  • inspection standards
  • calibration status
  • reaction plan
  • machine parameter sheet
  • training records
  • change notes / ECN

A common example is mismatch between PFMEA controls and actual shop floor controls.

For instance, PFMEA may require 100% sensor check, but the actual line may only be doing hourly sampling.

That is a major finding.

Opening Meeting and Team Alignment:

Never skip the opening meeting.

I usually keep it to 10–15 minutes.

The purpose is to align:

  • audit objective
  • scope
  • timing
  • key people
  • safety requirements
  • line availability

This avoids resistance during the audit.

I normally tell the team:

“This is not a fault-finding exercise. This is a process improvement audit.”

This simple sentence changes the tone of the audit completely.

It helps operators and supervisors cooperate openly.

Real Example from My Audit Experience:

Let me give you a practical example.

During an internal audit in an assembly line, the control plan required torque verification every 2 hours.

When I checked the records, the supervisor had signed every interval.

However, during the shop floor walkthrough, the torque wrench memory log showed missing data for 6 hours.

This is why audit evidence collection must always include physical verification, not only document review.

That single finding helped avoid a major customer line-stop risk.

How to Conduct VDA 6.3 Internal Process Audit?

Once the planning stage is complete, I move into the most important part of the audit process: the actual execution on the shop floor. This is where how to conduct VDA 6.3 internal process audit becomes practical, measurable, and highly valuable for the company.

In my experience as a Quality Manager and certified auditor, this stage is where we separate assumptions from facts because documents may say one thing while the real process may show something different.

A strong execution phase focuses on people, process flow, records, controls, and actual evidence.

The biggest mistake I have seen in many internal audit automotive programs is overdependence on paperwork. VDA 6.3 is a process-based audit standard, which means the real focus must remain on how the process performs in actual production conditions.

This includes line startup, material flow, machine settings, operator practices, inspection controls, and escalation methods. A good internal process audit must always validate whether the process is capable of consistently meeting customer requirements.

Step 1: Start with a Process Walkthrough

The first activity I always perform is a full process walkthrough from input to output. I never begin by sitting in a conference room with forms and reports.

Instead, I go directly to the actual process and physically follow the product journey from raw material receipt until final packing or dispatch. This helps me understand the true process flow and identify where process risks may exist.

For example, in a machining line, I usually walk through:

  • raw material identification
  • machine loading
  • first-off approval
  • in-process gauging
  • deburring
  • final inspection
  • packing and labeling

During this walkthrough, I check whether the actual sequence matches the approved process flow chart and control plan. In many audits, nearly 30% of findings originate from undocumented process deviations, especially after engineering changes or layout modifications.

This makes the walkthrough one of the most valuable parts of the internal VDA 6.3 audit steps.

A practical example from one of my previous audits involved a welding cell where the documented flow showed a visual inspection step before packing, but the operator was bypassing it during night shift to meet hourly output.

This was a major process control gap and could have led to customer defects.

Step 2: Use Effective Audit Interview Techniques

One of the most critical skills in any VDA audit is using the right audit interview techniques. The way you ask questions directly affects the quality of responses and the usefulness of audit evidence.

I always avoid asking closed questions like “Do you follow the work instruction?” because the answer will almost always be “yes.” Instead, I ask open and process-based questions.

Examples of strong questions include:

  • Can you show me how you verify the first piece?
  • What do you do if the measurement goes out of tolerance?
  • How do you know this is the latest work instruction?
  • What is your reaction plan if the machine alarm appears?
  • Who approves parameter changes?

These questions help assess both process understanding and actual compliance.

A very useful technique I follow is the show me, explain to me, and prove it method. First, I ask the operator to show the activity. Next, I ask them to explain why it is done. Finally, I verify objective evidence such as records, logs, or system entries.

For example, if an operator says torque checks are done every hour, I immediately verify:

  • tool memory data
  • inspection log sheet
  • supervisor verification record
  • calibration validity

This strengthens audit evidence collection and improves report quality.

Step 3: Collect Objective Audit Evidence

A VDA 6.3 audit must always be evidence-based. Personal opinions or assumptions should never become findings. Every observation must be supported by objective audit evidence, and this is where many beginner auditors struggle.

I typically collect evidence from five sources:

  • documents
  • physical observations
  • interviews
  • records
  • digital system data

For example, if I am auditing traceability controls, I verify:

  • lot number labels
  • ERP transaction records
  • barcode scan history
  • packing list
  • dispatch record

In one real example, the process sheet showed batch traceability at box level, but the actual pallet labels had incomplete lot details. This created a containment risk because the company would not have been able to isolate suspect material quickly in case of a customer complaint.

Studies across manufacturing audits show that companies with strong evidence-based audits improve CAPA effectiveness by up to 40%, mainly because the root causes are identified more accurately.

Step 4: Audit the Process Elements P1 to P7

A strong VDA 6.3 audit should assess the relevant process elements depending on the audit scope. For internal production audits, the most frequently used elements are P5, P6, and P7, but I always verify the full linkage from project to customer support where required.

Here is how I typically assess them:

P1 – Potential Analysis:

This is more relevant for supplier evaluation and project capability assessment. I use it when auditing new suppliers, new plants, or new launches.

P2 – Project Management:

I check launch timelines, APQP status, milestone reviews, and risk escalation.

P3 – Product and Process Development Planning:

This includes design review, process planning, PFMEA, and resource readiness.

P4 – Product and Process Development Realization:

I verify prototype trials, run-at-rate, validation, and approval readiness.

P5 – Supplier Management:

This includes supplier quality monitoring, incoming inspection, and supplier corrective actions.

P6 – Process Analysis / Production:

This is the most critical section for shop floor audits.

I review:

  • machine settings
  • poka-yoke
  • SPC
  • control plan adherence
  • work instruction compliance
  • reaction plans
  • line clearance

P7 – Customer Support / Satisfaction:

This covers complaint handling, warranty feedback, and response closure.

Deep Dive: Auditing P6 on the Shop Floor

In most companies, P6 generates the highest number of findings because it directly covers manufacturing controls. I usually spend nearly 50% of audit time in this section.

Some key checkpoints I always verify include:

  • Is the correct material being used?
  • Are machine parameters locked?
  • Are process controls effective?
  • Is in-process inspection working?
  • Are operators trained?
  • Is abnormality escalation clear?

For example, in a CNC line audit, I found that spindle offset correction was being adjusted manually without supervisor approval. This created variation in dimension control and resulted in recurring rework.

That single finding later helped reduce rejection by 18% over three months after corrective actions were implemented.

Audit Scoring and Grading:

VDA 6.3 uses a scoring methodology based on compliance and effectiveness. Each question is scored depending on how well the requirement is fulfilled.

Typical scoring levels include:

  • fully compliant
  • mostly compliant
  • partially compliant
  • not compliant

The final percentage score determines the audit rating.

As a practical internal audit benchmark, I usually follow:

  • 90% and above = strong process control
  • 80–89% = acceptable but improvement required
  • below 80% = significant process risk

Statistics from automotive internal audits often show that processes scoring below 85% are more likely to experience repeat customer issues within six months if no immediate corrective action is taken.

This makes scoring a very useful process risk indicator.

Common Mistakes I Frequently Observe:

From my own audits, these are the most common mistakes companies make during internal process audits:

  • focusing only on documents
  • ignoring shop floor reality
  • asking weak interview questions
  • no evidence-based findings
  • poor scoring justification
  • delayed CAPA closure
  • weak follow-up reviews

One example I often see is a beautifully maintained checklist with no actual production observations. This reduces the audit to paperwork and removes the real benefit of VDA 6.3.

A good audit should always challenge the actual process.

Example: Live Audit Finding

Let me share a real practical example.

During an assembly line audit, the control plan required 100% barcode scan validation before final packing. The record sheet showed full compliance.

However, when I physically observed the line for 40 minutes, I found that operators were manually overriding the scan alarm during peak load hours. This was not documented in any deviation note.

That single finding helped prevent a major traceability failure.

This is exactly why process audit follow-up becomes essential, which I will cover in the next part.

VDA 6.3 Audit Report Writing: Turning Findings into Action

Once the shop floor audit is completed, the next most important stage is VDA 6.3 audit report writing.

In my experience as a Quality Manager and certified auditor, this is where the true value of the audit is captured because a good audit that is poorly documented often leads to weak follow-up and repeated issues.

The report should clearly explain what was checked, what was found, the risk level, and what actions are required. A strong report makes it easy for production, quality, engineering, and leadership teams to act quickly.

I always structure my audit report into the following sections:

  • audit objective
  • scope and process area
  • audited process elements (P1 to P7 as applicable)
  • key findings
  • score and classification
  • risk summary
  • corrective action plan
  • owner and due dates
  • effectiveness review date

For example, if I audited a machining process under P6 Process Analysis and Production Control, the report should clearly state the exact process step where the issue was found.

Instead of writing something vague like “inspection issue observed,” I write something specific such as: “Hourly bore diameter verification record missing for shift B between 14:00 and 18:00, resulting in process control risk.”

That level of clarity improves closure speed and accountability.

Example of a Strong Audit Finding:

Here is how I usually document findings in a professional and SEO-friendly format.

Finding: Torque verification record incomplete for assembly station 3
Requirement: Control plan CP-014 requires hourly verification
Evidence: Missing records for 5 consecutive hours during second shift
Risk: Possible torque variation leading to field failure
Clause: P6.4 / P6.5
Severity: Major
Action Required: Immediate containment and root cause analysis

This approach makes the report useful for both internal teams and customer audit readiness.

According to recent audit best practices, organizations that use evidence-based and risk-prioritized reporting improve CAPA closure efficiency by 25–40% compared with generic observation-based reporting.

Corrective Actions Process Audit: How I Drive CAPA?

Once findings are documented, the next step is the corrective actions process audit workflow. This is where many companies lose momentum because findings remain open for too long.

I always follow a structured CAPA flow:

  • immediate correction
  • root cause analysis
  • corrective action
  • preventive action
  • effectiveness verification
  • closure

For example, if an operator missed inspection checks, the immediate correction may be to inspect all affected material and segregate suspect stock. However, that alone is not enough. The corrective action must address why the check was missed.

Typical root causes I often see include:

  • unclear work instruction
  • no shift handover process
  • insufficient training
  • poor supervision
  • overload during peak production

The real value comes from fixing the system, not only the symptom.

Root Cause Example from a Real Internal Audit:

Let me share a practical example from one of my audits.

During an internal audit of an assembly process, I found repeated label mismatches between the ERP-generated batch number and the final shipping label. At first, the team believed this was an operator issue.

However, during 5 Why analysis, the actual root cause was identified as a software synchronization delay between the MES terminal and label printer server.

The corrective action plan included:

  • server sync refresh every 5 minutes
  • auto mismatch alert
  • supervisor verification every shift
  • IT validation test
  • effectiveness review after 30 days

After implementation, the mismatch rate reduced by 92% within one month.

This is exactly why audit evidence collection and root cause depth matter.

Process Audit Follow-Up: Never Close Too Early

One of the most overlooked areas in internal audit automotive systems is process audit follow-up. I never close an audit finding immediately after the action is implemented.

Closure should only happen after effectiveness verification.

For example, if the corrective action was operator retraining, I verify:

  • training record completed
  • operator competence check passed
  • defect trend reduced
  • no repeat issue in next 2 weeks
  • supervisor confirms compliance

This follow-up phase is extremely important because VDA 6.3 emphasizes sustainable process control, not temporary fixes.

A best practice I strongly recommend is a 30-60-90 day follow-up cycle.

Example:

  • 30 days = implementation check
  • 60 days = KPI trend review
  • 90 days = sustained effectiveness review

This fits perfectly into the VDA 6.3 audit cycle.

VDA 6.3 Audit Cycle for Continuous Improvement:

An internal process audit should never be treated as a one-time activity. I always build it into a recurring audit cycle linked with risk and performance trends.

A strong cycle usually includes:

  • annual master audit plan
  • quarterly high-risk audits
  • complaint-triggered audits
  • launch audits
  • follow-up audits
  • management review inputs

For high-risk production lines, I recommend monthly focused audits on:

  • traceability
  • poka-yoke
  • process parameter control
  • final inspection
  • escalation controls

Industry data shows that companies using quarterly risk-based internal process audits often reduce customer complaints by 15–30% annually.

To conduct a VDA 6.3 internal process audit effectively, start with scope definition and process planning, then perform shop floor verification, collect objective evidence, score findings, issue a structured audit report, and ensure corrective actions are followed through with effectiveness checks.

The process should be part of a recurring audit cycle to drive continuous improvement and reduce customer quality risks.

The most effective way to conduct a VDA 6.3 internal process audit is to follow a clear cycle of planning, execution, reporting, corrective action, and follow-up. As a Quality Manager, I always focus on real process controls, operator understanding, traceability, and risk-based evidence rather than paperwork alone.

Final Conclusion:

From my practical experience, the companies that benefit most from VDA 6.3 are not necessarily the ones with the highest scores, but the ones that use the audit as a continuous improvement tool.

A strong internal process audit helps reduce defects, improve process capability, strengthen customer confidence, and prepare the business for external audits and OEM requirements.

If done correctly, this process becomes much more than compliance.

It becomes a business performance system.

Frequently Asked Questions (FAQs)

1. What is a VDA 6.3 internal process audit?

A VDA 6.3 internal process audit is a structured audit method used to evaluate whether a company’s manufacturing, development, and support processes are working effectively and meeting customer requirements.

It is widely used in the automotive industry to assess process controls, risk management, traceability, operator compliance, and process capability. The audit follows a question-based scoring system across process elements such as supplier management, production control, and customer support.

In simple terms, it helps companies identify weaknesses before they turn into customer complaints, defects, or certification issues.

2. How often should a company conduct a VDA 6.3 internal audit?

The frequency of a VDA 6.3 internal process audit depends on the risk level of the process and customer requirements. In my professional recommendation, high-risk production lines should be audited at least quarterly, while stable and low-risk support processes may be audited once or twice a year.

Many automotive companies also perform special audits after major process changes, customer complaints, or new product launches. A risk-based audit schedule helps improve process stability and ensures continuous compliance.

A common best-practice frequency is:

  • monthly for critical production processes
  • quarterly for medium-risk lines
  • half-yearly for support functions
  • immediately after major changes

3. What documents are required before conducting a VDA 6.3 audit?

Before starting the audit, it is important to review all process-related documents so that the audit can be evidence-based and effective. Typically, I always review the process flow chart, PFMEA, control plan, work instructions, inspection standards, calibration records, and training matrix.

These documents help the auditor compare documented controls against actual shop floor practices. Missing or outdated documents often become major audit findings during internal audits.

Key documents usually include:

  • process flow diagram
  • PFMEA
  • control plan
  • SOP / work instructions
  • inspection check sheets
  • calibration certificates
  • operator training records
  • customer-specific requirements

4. What are the main steps in how to conduct VDA 6.3 internal process audit?

The main steps include planning, scope definition, process walkthrough, evidence collection, scoring, reporting, and follow-up. I always begin with process audit planning and risk assessment before moving to shop floor verification.

During the audit, the focus should remain on actual process performance, operator understanding, and compliance with the control plan.

Once findings are identified, they should be linked with corrective actions and effectiveness checks.

The standard flow is:

  • define scope
  • prepare checklist
  • conduct shop floor audit
  • interview operators and supervisors
  • collect evidence
  • score findings
  • prepare report
  • close CAPA with follow-up

5. Which VDA 6.3 process elements are most important for internal audits?

For most internal manufacturing audits, the most important process elements are P5, P6, and P7. P5 covers supplier management, P6 focuses on process analysis and production control, and P7 deals with customer support and complaint handling.

In my experience, P6 generates the highest number of findings because it directly relates to production controls such as machine settings, inspections, traceability, and operator compliance.

However, the final scope should always depend on the business process being audited.

6. How is VDA 6.3 audit scoring done?

VDA 6.3 audit scoring is based on the degree of compliance and effectiveness of each process requirement. Each audit question is evaluated and assigned a score depending on how well the requirement is fulfilled.

The total score is then converted into a percentage that reflects the maturity and stability of the process. Higher scores indicate better process control and lower operational risk.

A simple internal benchmark can be:

  • 90% and above = strong process
  • 80–89% = acceptable with improvements needed
  • below 80% = high risk requiring immediate action

7. What are the most common findings in a VDA 6.3 internal audit?

The most common findings usually relate to process discipline and control failures. Based on my audit experience, frequent issues include missing inspection records, outdated work instructions, weak traceability, inadequate training, and non-adherence to control plans.

Another common gap is when the documented process does not match actual shop floor practice.

These findings can significantly affect process capability and customer satisfaction if not addressed quickly.

Common findings include:

  • missing hourly inspection checks
  • wrong revision documents
  • incomplete traceability
  • operator skill gaps
  • no escalation reaction plan
  • uncontrolled parameter changes

8. How should corrective actions be handled after the audit?

Corrective actions should follow a structured CAPA approach with clear ownership, target dates, and effectiveness verification.

I always recommend first applying immediate containment to control risk, followed by root cause analysis using tools like 5 Why or Fishbone Analysis. The action should fix the system issue, not only the symptom.

Finally, the auditor must verify whether the action actually prevented recurrence before closing the finding.

A strong CAPA flow includes:

  • immediate correction
  • containment action
  • root cause analysis
  • corrective action
  • preventive action
  • effectiveness check
  • final closure

9. Why is VDA 6.3 important for automotive companies?

VDA 6.3 is extremely important because it helps automotive companies maintain strong process control, reduce defects, and meet OEM and customer-specific quality requirements.

Many customers in the automotive supply chain expect suppliers to follow structured process audit methods.

A well-executed internal VDA 6.3 audit can reduce customer complaints, improve process capability, and strengthen audit readiness for IATF 16949 and customer audits. It is one of the most practical tools for proactive risk management in manufacturing.

10. Can VDA 6.3 internal audits improve production performance?

Yes, absolutely. In fact, one of the biggest benefits of conducting internal VDA 6.3 audits is improved operational performance. When done properly, these audits help identify waste, variation, recurring defects, and control weaknesses before they affect the customer.

In my experience, companies that run regular risk-based internal audits often see improvements in rework reduction, process capability, OEE stability, and complaint closure time.

This makes the audit not just a compliance tool, but a strong business improvement system.

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