P0606 GMC Engine Control Module Internal Performance Error

Possible causes

– Engine Control Module (ECM) Harness power supply circuit is open or shorted
– Engine Control Module (ECM) Programming
– Faulty Engine Control Module (ECM)

Tech description

Check the PCM fuse, if fuse is OK try erasing the code first and if the code comes back you may have to reprogram or replaced the PCM.

When is the obd code mean?

Indicates the PCM has experienced an internal memory fault.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Engine may not start

P0606 GMC OBD Code Description