Code U3005 indicates a malfunction in the Retained Accessory Power (RAP) system. This system allows specific electrical accessories, such as the radio and power windows, to remain operational after the ignition is turned off until a door is opened.
A failed or stuck door ajar switch prevents the system from detecting when a door is opened to kill accessory power.
Frayed, shorted, or corroded wiring in the RAP circuit can disrupt the signal between the switch and the control module.
A stuck or burnt-out relay may either permanently provide power or fail to provide power to the accessories.
Poor grounding in the electrical system can cause erratic behavior or a complete failure of the RAP circuit.
The BCM typically manages the RAP logic; internal circuitry failure can cause the system to malfunction.
While rare, a failure in the engine computer's communication with the BCM could trigger this code.
No. The RAP system is primarily managed by the BCM and door switches. Replacing the PCM is rarely the correct fix and is usually unnecessary.
No, this is a convenience system fault and does not typically affect the engine's ability to start or run.
Low system voltage can sometimes trigger communication codes, but U3005 is more likely a circuit or switch failure.