Technical Definition:

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

Trouble Code: P0687
Address: 0x0687
System: Powertrain
Subsystem: Computer and Auxiliary Output Circuits
Technical Description:

Possible Causes:

Possible Symptoms:

Engine Control Module Voltage Error High

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:

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