P0606 Code: Engine Control Module (ECM/PCM)

Quick answer

P0606 is a generic OBD-II trouble code that means: Engine Control Module (ECM/PCM) – Processor Fault. Avoid driving. This fault can cause stalling, overheating or expensive damage (such as to the catalytic converter or engine).

What does P0606 mean?

P0606 is a generic OBD-II trouble code that means: Engine Control Module (ECM/PCM) – Processor Fault. The engine control module (ECM) stores this code when it detects a fault related to: Engine Control Module (ECM/PCM).

Can I still drive?

Severity: High

Avoid driving. This fault can cause stalling, overheating or expensive damage (such as to the catalytic converter or engine).

Symptoms

Check engine light is on
Engine stalls
Hard starting
Car goes into limp mode

Common causes

ECM software issue or internal fault
Faulty alternator, voltage regulator or battery
Damaged wiring or a loose/corroded connector

How to fix it

Read all stored codes and freeze-frame data with an OBD-II scanner
Test the battery and alternator (about 13.5–14.7 V with the engine running)
Check for ECM software updates and technical service bulletins
If unsure, have a qualified mechanic diagnose it

Frequently asked questions

What does code P0606 mean?

What causes code P0606?

The most common causes are: ECM software issue or internal fault; Faulty alternator, voltage regulator or battery; Damaged wiring or a loose/corroded connector.

How do I fix code P0606?

Start with these steps: Read all stored codes and freeze-frame data with an OBD-II scanner; Test the battery and alternator (about 13.5–14.7 V with the engine running); Check for ECM software updates and technical service bulletins; If unsure, have a qualified mechanic diagnose it.

Is it safe to drive with code P0606?

Severity: High. Avoid driving. This fault can cause stalling, overheating or expensive damage (such as to the catalytic converter or engine).

P0606: Engine Control Module (ECM/PCM) – Processor Fault