CarFix Answers

P0606: PCM / ECM Processor Fault

Severity: high

What it means: The engine computer detected an internal processor fault in itself.

Safe to drive? Use caution. The engine may stall or go into limp mode.

Common symptoms

Likely causes, ranked

  1. Software that needs reprogramming$108Shop

    CarMD 2024 national average about $108

  2. Low voltage or poor grounds affecting the moduleDIY
  3. Failed engine computerShop
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What it means: The engine computer detected an internal processor fault in itself.

Severity: High. Safe to drive? Use caution. The engine may stall or go into limp mode.

DIY or shop?

Check the battery and grounds, then go to a shop or dealer for reprogramming or replacement.

Before you replace parts

  1. Read all stored codes and freeze-frame data. Fix misfire, fuel or sensor codes before chasing emissions codes.
  2. Check the simple things first: connectors, vacuum hoses, fluid levels and the gas cap.
  3. Clear the code only after a repair, then confirm it stays off after a few drives.
  4. Check your VIN for recalls and service bulletins.

Safety / mechanic note

Verify with a mechanic. This code can involve stalling, engine damage or loss of power. If the check-engine light is flashing, or the car stalls or runs badly, stop driving and have it inspected.

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Sources