Fault Code P0686
Code meaning, symptoms, possible causes, part number, and estimated cost.
P0686
ECM/PCM Power Relay Control Circuit Low
This code indicates an abnormally low voltage in the control circuit of the Engine Control Module (ECM) / Powertrain Control Module (PCM) power relay. This can prevent the vehicle's computer from receiving power or shutting down properly.
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
- Hard starting
Possible Causes
- 1Faulty PCM/ECM power relay
- 2Damaged wiring or short in the control circuit
- 3Problem with the PCM/ECM
- 4Blown fuse
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