Engine Control Module / PCM Power Input Signal Range / Performance Problem
There's a power problem with the Engine Control Module (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 ECM isn't getting the right voltage it needs to work properly. It typically needs about 12 volts to operate, and if it drops below that, the car can start having issues.
What the computer is actually seeing
The ECM monitors its own power input and compares it to expected voltage levels. If it reads below 10 volts or above 14 volts when the vehicle is running, it sets a fault code.
What a healthy reading looks like
The ECM should see a voltage between 11.5 volts and 14.5 volts 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.
- 1Check battery voltage — Should be above 12.4 volts. If below, recharge or replace battery.
- 2Inspect battery terminals and connections — Look for corrosion or loose connections. Repair if needed.
- 3Examine the ground connections for the ECM — Make sure they are clean and secure. If faulty, clean or replace the ground.
- 4Check the wiring harness to the ECM for damages or shorts — Look for pinched wires or broken insulation.
- 5Test the ECM power input signal with a multimeter — Should read between 11.5 to 14.5 volts. If not, investigate wiring further.
Common causes
- Bad battery connection
- Faulty ground or wiring harness
- Weak battery
- Faulty ECM
- Corroded connectors
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to avoid driving until it's fixed. It can lead to more serious issues.
Will this code come back after clearing it?
If the underlying issue isn't fixed, yes, it will likely come back.
Why does this code appear with others?
Other codes could indicate related electrical issues, often linked to the ECM's power supply.
Working a real vehicle right now?
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