Power Supply Input Voltage - High/Low
The power supply voltage to the control module is outside the acceptable range.
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 control module is getting too much or too little voltage, which can mess up how it works.
What the computer is actually seeing
The control module expects a voltage range of 10.5V to 32.0V for proper operation but detects values outside this range.
What a healthy reading looks like
10.5V to 32.0V
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. Check battery voltage. Ensure it's between 12.4V and 12.8V with the engine off.
- 22. Inspect wiring and connectors related to the control module for damage, corrosion, or loose connections.
- 33. Measure voltage at the power supply input terminal of the ECM with the ignition on. Should be 10.5V to 32.0V.
- 44. If voltage is outside this range, check the fuse and relay related to the ECM power supply.
- 55. If all checks are good, monitor for intermittent problems. If they reoccur, the ECM may be faulty.
Common causes
- Faulty wiring or connectors to the ECM
- Weak battery or poor connection
- Faulty voltage regulator
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to fix this soon; it can lead to erratic engine behavior.
Will this code come back after resetting?
If the underlying issue isn't fixed, yes, it will likely return.
Why does this code appear with other codes?
Voltage issues can affect multiple systems, causing related fault codes.
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