Enhanced Power Mode Request Malfunction
The system detected a problem with the power mode request from the control module.
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 is not getting the right signals to know whether it should be in a high or low power mode, which can affect performance and efficiency.
What the computer is actually seeing
The ECM expects to receive a power mode request signal within a certain range (typically a digital signal from the body control module); when this signal doesn't align with the expected parameters, a fault triggers.
What a healthy reading looks like
Power mode request signal should be a valid high or low signal (high typically around 12V to 14V, low near 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.
- 1Check the vehicle's battery voltage (should be between 12.4V to 12.6V when the engine is off). If low, charge or replace the battery.
- 2Inspect wiring and connectors related to the body control module for corrosion, damage, or looseness.
- 3Verify the power mode request signal with a scan tool; should read as high or low appropriately. If reading is outside expected values, proceed to check the body control module.
Common causes
- Faulty body control module
- Bad wiring or connections in power mode circuit
- Low battery voltage or poor battery health
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; you can drive but expect reduced performance. Fix it soon to avoid worsening issues.
Will this code come back?
If the underlying issue isn't fixed, yes, it will likely reset upon the next drive cycle.
Why is this code paired with others like B1258?
These codes often relate to the same circuit or module, indicating multiple failures in similar systems.
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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