Fault Code P0688
Code meaning, symptoms, possible causes, part number, and estimated cost.
P0688
ECM/PCM Power Relay Sense Circuit/Open
This code indicates an open circuit (lack of electrical connection) in the sense circuit of the Engine Control Module (ECM) / Powertrain Control Module (PCM) power relay. This means the PCM/ECM is not receiving information about the relay's status.
Part Details
Part Name
PCM/ECM Power Relay
Reference P/N (OEM)
N/A
General part number for this fault code — not necessarily for your specific vehicle
Estimated Cost
₪200 - ₪1000
Engine Location
Engine bay / Fuse box
Symptoms
- Engine does not start
- Engine stalls unexpectedly
- Check Engine Light on
- Multiple electrical system failures
Possible Causes
- 1Disconnected or broken wiring in the sense circuit
- 2Loose or corroded connector
- 3Faulty PCM/ECM power relay
- 4Problem with the PCM/ECM
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