Engine Control Module (ECM) Power Input Signal
Indicates a problem with the power supply to the ECM.
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 Engine Control Module (ECM) isn't getting the power it needs to operate correctly, which can make the engine act up or even fail to start.
What the computer is actually seeing
The ECM monitors its own power input voltage and expects to see between 10 to 16 volts during operation. If it sees less than that, it triggers the fault code.
What a healthy reading looks like
10-16 volts input at the ECM power terminals during engine operation.
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.
- 11. Verify battery voltage; should be 12.6 volts or higher at rest, and 13.5 to 14.5 volts while running.
- 22. Inspect the battery terminals and cables for corrosion, looseness, or damage. Fix as necessary.
- 33. Check the fuses related to the ECM power supply; replace any that are blown.
- 44. Inspect the wiring harness from the battery to the ECM for opens or shorts.
- 55. Measure voltage at the ECM power input terminals with the key on and the engine off; it should be 10-16 volts. If it's low, trace back to the power source.
Common causes
- Poor battery connection
- Faulty power supply to ECM
- Blown fuse in ECM circuit
- Damaged wiring harness to ECM
- Faulty ECM
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I drive with this code active?
No, this code can lead to engine stalling or failure to start, so it's not safe to drive.
Will this code come back after repairs?
If the source of power loss is fixed, the code should not return. If it does, further diagnostic may be needed.
What other systems might be affected by this issue?
If the ECM isn't receiving proper power, it can affect all functions the ECM controls, including fuel injection and ignition.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →