ECM/PCM Power Relay De-Energized Performance
The ECM/PCM is not receiving power as required during key-on.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The computer that controls the engine isn't getting the power it needs to operate correctly, causing potential issues with starting or running the engine.
What the computer is actually seeing
The engine control module (ECM) detects that the power relay for its operation is not functioning properly, resulting in insufficient voltage being supplied when it should.
What a healthy reading looks like
The ECM should receive around 12-14 volts when the key is in the ON position.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Check battery voltage; should be between 12-14 volts.
- 2Inspect the ECM power relay; check for any visible damage or burns.
- 3Test the power supply to the ECM; ensure there's 12 volts when the key is on.
- 4Inspect wiring from the power relay to ECM for any shorts or damage.
- 5Replace any faulty or damaged components based on findings.
Common causes
- Faulty ECM/PCM
- Bad power relay
- Wiring issues (shorts or opens)
- Bad battery connections or weak battery
- Fusible links blown
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, it's not safe to drive as the engine may not start or run properly.
Will this code come back after clearing?
It can return if the underlying issue isn't resolved.
What if my car starts fine but the code is still present?
You may experience intermittent issues; check for any related electrical problems.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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