What this code means

The DME detected that the engine idle speed is outside the acceptable range and cannot be corrected by the idle speed control system. The engine speed deviates from the target idle RPM by more than the allowable margin.

Symptoms

• Rough or unstable idle
• Idle speed too high or too low
• Engine stalling
• Check Engine Light

Common causes

• Vacuum leak
• Dirty throttle body
• Faulty idle air control valve
• Incorrect base idle setting
• Air intake leak after MAF sensor

Diagnostic steps

1. Check for vacuum leaks with smoke machine
2. Clean throttle body
3. Test idle air control valve
4. Perform idle adaptation with scan tool
5. Check intake system for leaks

Repair notes

Repair vacuum leaks and clean throttle body; perform idle speed adaptation.

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