P2510
ECM/PCM Power Relay Sense Circuit Range/Performance
The voltage reported on the main power relay sense line for the engine controller does not match expectation. The ECU may shut down too early or stay awake too long, draining the battery.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Main relay contacts pittedCommon
- Sense wiring corrodedPossible
- Sensor element aged beyond calibration windowLess likely
Parts involved
- Main Relay
- ECM
P2510 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.