What is a Supplier Corrective Action Report (SCAR)?

A SCAR is a formal document sent by a customer to a supplier when a nonconformity is detected. It requires the supplier to investigate root causes, implement corrective actions, and provide evidence of effectiveness — typically using the 8D methodology.

How do you write an effective SCAR?

An effective SCAR clearly describes the nonconformity with objective evidence (photos, measurements, dates), specifies the containment actions required (sort, quarantine, 100% inspection), sets a response deadline, and includes verification criteria. The supplier should respond using 8D format (D1-D8).

What is the difference between SCAR and 8D?

SCAR is the request document sent TO the supplier. 8D is the response document sent BY the supplier. In practice, most OEMs require suppliers to respond to a SCAR using the 8D format, making them complementary components of the supplier quality process.

What should be included in a SCAR response?

A complete SCAR response should include: D1 team members, D2 problem description with 5W2H, D3 containment actions with evidence, D4 root cause analysis (5-Why and fishbone), D5-D6 corrective actions with implementation dates, D7 systemic prevention, and D8 verification evidence.

How long does a supplier have to respond to a SCAR?

Typically, suppliers must acknowledge receipt within 24 hours (D1-D3), provide root cause analysis within 5-10 working days (D4), and complete permanent corrective actions within 30 days (D5-D6). Severe quality issues may require faster response times.

Can you give a corrective action example?

Real corrective action example — PCB solder crack issue: (1) Containment: 100% visual inspection of all 1,200 units in warehouse, quarantined Lot#A382. (2) Root Cause (5-Why): thermocouple drift caused reflow temperature excursion. (3) Permanent Corrective Action: replaced thermocouple, changed calibration interval from 12 months to 6 months, added SPC monitoring. (4) Verification: 0 defects in 500-unit pilot run, Cpk improved from 0.8 to 1.67. (5) Prevention: updated PFMEA, horizontal deployment to 3 other reflow ovens.

Supplier Corrective Action Report (SCAR) — Complete ...

How to write supplier corrective action reports using 8D methodology. D0～D8の各ステップ、根本原因分析、暫定処置と恒久処置、IATF 16949のベストプラクティスを解説。実際の不良事例、5-Whyと特性要因図、無料テンプレート、AIによる...

A SCAR is a formal document sent to a supplier when a nonconformity is detected. Most OEMs require suppliers to respond using 8D format. SCAR is the request, 8D is the response.

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