Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pinpoint Test B: Powertrain Control Module (Pcm) Power Relay
Refer to ELECTRONIC ENGINE CONTROLS - 2.3L for schematic and connector information.
Normal Operation and Fault ConditionsÂ
Refer to the DTC Fault Trigger Conditions.
DTC Fault Trigger ConditionsÂ
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| PCM P0685:00 | ECM/PCM Power Relay Control Circuit/Open: No Sub Type Information | Sets when the ISP-R circuit indicates the ignition is in the OFF, ACC, or LOCK mode, and the amount of time the PCM remains powered through the PCM power relay exceeds a predetermined amount of time. Ability to communicate with the PCM when the ignition is in the OFF, ACC, or LOCK mode indicates a hard fault. |
| PCM P068A:00 | ECM/PCM Power Relay De-Energized - Too Early: No Sub Type Information | Sets when the non volatile random access memory write did not complete successfully after the ignition key was turned OFF, prior to PCM shutdown. This DTC also sets when the PCM power relay is de-energized too early. |
| PCM P06B8:00 | Internal Control Module Non-Volatile Random Access Memory (NVRAM) Error: No Sub Type Information | Sets when the PCM detects a concern with the ability of the PCM to correctly store permanent Diagnostic Trouble Codes (DTCs). Check for other Diagnostic Trouble Codes (DTCs) and diagnose those first. Check for aftermarket performance products. Check for an electrical or charging system concern. If an updated calibration is available, update the calibration to the latest level. If an updated calibration is not available, clear the Diagnostic Trouble Codes (DTCs) and repeat the self-test. If this DTC is retrieved after a PCM reprogramming, turn the ignition OFF and allow the PCM to complete a normal power down sequence. |
Possible SourcesÂ
- PCM power circuitry concern
- PCM power relay (12A646)
- PCM (12A650)
PINPOINT TESTS B: POWERTRAIN CONTROL MODULE (PCM) POWER RELAY (Gas)
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.