This diagnostic trouble code indicates the engine control module has detected an open circuit in the power relay sense line. It means the computer is not receiving the expected voltage signal confirming the main power relay is active. This condition often cuts power to critical engine management systems.
The fuse supplying power to the relay control or output circuit has failed.
The main relay responsible for energizing the PCM has stopped functioning internally.
The harness between the relay box and the computer has broken or chafed.
Poor electrical contact exists at the relay socket or module plug.
A bad ground connection prevents the relay control circuit from completing.
The internal circuitry of the control module cannot process the signal (rare).
No, the engine may not start or could stall without warning.
Rarely. This issue is usually caused by fuses, relays, or wiring before the computer is at fault.
Heat, vibration, and corrosion often degrade connections over time.
Yes, insufficient voltage can prevent the relay from engaging properly.