In automotive supply, a customer complaint or a rejected delivery usually starts a formal corrective action process. IATF 16949 expects suppliers to have a documented problem-solving process, and many automotive customers ask for the answer as an 8D in their own format. This page is about the first response: what to send in the first hours and days, how to contain stock, how to define a clean point, and what an IATF-minded customer checks. For the standard itself, see IATF 16949 8D requirements. Your customer’s requirements always come first.
The clock starts when the complaint arrives
Automotive customers usually set staged deadlines for an 8D. The exact times differ by customer and are written in their customer-specific requirements, supplier manual, or portal. A common pattern looks like this:
Within hours (often the same or next working day)
Acknowledge the complaint, name the team leader, and confirm containment has started. Many customers expect a first D1–D3 answer this fast; check the deadline in your customer’s requirements or portal.
Within days
Containment results with quantities, the clean point definition, and a first view of the root cause analysis plan. Some customers ask for an interim D4 status at this stage.
Within weeks
Verified occurrence and escape root causes, permanent corrective actions with dates, and a plan for verifying effectiveness. Closure follows once D6 evidence is accepted by the customer.
If you can’t meet a stage, say so before the deadline, with what you have and when the rest follows. A late answer with no message is read worse than an honest interim status.
Contain every place the suspect parts can be
The first question from the customer is usually “are we protected?” Answer it with a list of every location, the quantity checked, the method, and the number of rejects found. Check:
- Customer plant and line-side stock, plus any parts in transit
- Your finished goods, warehouses, and any external or consignment stock
- Work in process and parts waiting for rework or sorting
- Service and spare-part stock, if the same part number is supplied there
- Sub-supplier material, if the cause may sit upstream
State who sorts at the customer site (your team or a sorting service) and the check method. “Containment in place” without numbers is the most common weak D3. More examples are on the 8D containment actions examples page.
Define the clean point
The clean point is the first lot, serial number, or date from which parts are known to be good, and how the customer can recognise them. Give the identifier, the reason it is clean (sorted, built after the fix, or both), and the label or marking used. Without a clean point the customer can’t release stock or stop sorting, and the complaint stays open longer.
Want this on paper for the next complaint? The free printable 8D / D4 checklist (PDF) covers D1–D8 with separate checks for containment, root cause, and verification. The free 8D checklist page explains each check.
Portals, templates, and formats
Many automotive customers manage complaints in a supplier portal with fixed fields, attachment rules, and status steps. Others send their own 8D template. Either way, the content has to fit their structure: fill every required field, attach the evidence they ask for, and keep the 8D number and part number consistent across portal, report, and labels. Prepare the text in your own tools, then copy it into their format.
Examples: weak vs stronger first responses
The examples below are illustrative and fictional, not from real cases.
Wrong torque on a bracket fastener (illustrative)
Weak: “Containment done. Operator retrained.”
Stronger: Sorted 2,400 parts at the customer and in our warehouse with a torque audit; 3 rejects. Clean point: first shipment built after the nutrunner was recalibrated, labelled with a green dot and listed by lot number. Root cause analysis plan attached.
Missing clip on a wiring harness (illustrative)
Weak: “Issue was isolated. Inspection added.”
Stronger: All harnesses from the affected shift range checked with 100% visual and pull test at our site and by a sorting service at the customer. Clean point from serial range given. Added check stated as temporary containment until a sensor-based detection is verified.
Burr on a machined housing (illustrative)
Weak: “Probably a tool wear issue. Will investigate.”
Stronger: Containment covers stock from the last verified good tool change. Suspect lots quarantined in the customer portal. Interim D4: tool life records and burr height measurements requested; owner and date named for the full D4.
Answering an automotive complaint? Get a free Accept / Conditional / Reject advisory on your 8D text, with missing containment or root cause evidence named, before you upload it.
8D Gate is a free pre-send readiness advisory. It doesn't replace the customer's decision. We don't store your 8D body in our database; you can delete anytime. Anthropic processes the text for the review.
What an IATF-minded customer looks for
- A cross-functional team with a named leader, not one quality engineer alone.
- Containment with numbers and a clean point, not a promise.
- Two root causes: why the defect was made and why it was not detected. See the 8D escape point.
- Causes backed by data, not “operator error”. See why operator error is not a root cause.
- Permanent actions that prefer error-proofing over more inspection, with owners and dates.
- Updates to the PFMEA, control plan, and work instructions, and the lesson applied to similar parts and lines.
- Verification of effectiveness before closure. See D6 verification of effectiveness.
If the customer formally asks for corrective action, the supplier SCAR 8D checklist walks through the full answer. If your 8D comes back, see 8D rejected: what to do next.
FAQ
- Is a customer complaint the same as a SCAR?
- Not always. A SCAR is a formal request for corrective action. A complaint or reject can arrive first as a quality notification or a phone call and become a formal request later. Treat both as the start of the 8D clock.
- Which 8D format should I use?
- The one your customer asks for. Many automotive customers require their own template or portal fields as part of their customer-specific requirements. Fill their format; use your internal tools to prepare the content.
- What does 8D Gate do with an automotive 8D?
- It reviews the 8D report text as a pre-send readiness check. You get an Accept / Conditional / Reject advisory with missing evidence and questions before you upload the answer. It isn’t a customer decision. The review tool is v0.1: it reviews English 8D reports, and the interface and report are in English. Templates are also available in German, Czech and Polish.
Free pre-send readiness check
Before the 8D goes into the customer portal, run the text through the free supplier 8D readiness check.
Paste text or upload PDF, DOCX, or Excel. You get an Accept / Conditional / Reject advisory, a score, section ratings, missing evidence, and questions to close gaps, with a PDF download. It is a pre-send readiness check for your team, not a customer decision.
8D Gate is a free pre-send readiness advisory. It doesn't replace the customer's decision. We don't store your 8D body in our database; you can delete anytime. Anthropic processes the text for the review.
Get the free 8D / D4 checklist
Keep the one-page version ready for the next customer complaint. It covers D1–D8 and goes deeper on containment, D4 root cause, and verification.
Get the free 8D / D4 checklist