Technical Definition:

Engine Control Module (ECM) / Powertrain Control Module (PCM) Power Relay Sensore Circuit / Open

Trouble Code: P0688
Address: 0x0688
System: Powertrain
Subsystem: Computer and Auxiliary Output Circuits
Technical Description:

Possible Causes:

Possible Symptoms:

Electronic Control Module Power Relay Sense Circuit/Open

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Weak battery – Low voltage while cranking
– Faulty Engine Control Module (ECM) relay
– Blown ECM fuse
– Faulty ECM
– ECM harness is open or shorted
– ECM circuit poor electrical connection

Specific Makes:

Leave a Reply

Your email address will not be published.