What causes a P0606 code?

Common causes: Failed PCM; Water intrusion in PCM connector; Bad ground.

What are the symptoms of a P0606 code?

Typical symptoms: CEL; Limp mode; Random shutdowns.

No — this code can cause damage if you keep driving. Get it diagnosed before continuing. Estimated repair: $500-$2,500.

OBD-II Code · Powertrain

PCM Processor

critical severityDo not drive$500-$2,500

Internal PCM processor fault.

Common symptoms

Likely causes

Where to start

Try the cheapest cause first. Start by checking: failed pcm.
Cost & scope. $500-$2,500
If the code returns after the fix: escalate to a shop or scanner with live-data and freeze-frame. A code that re-sets means the underlying fault is still there. Don't keep driving with this one active — risk of damage.

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