Four Wheel Drive (4WD) Systems DTCS

4X4 CONTROL MODULE DIAGNOSTIC TROUBLE CODE (DTC) LIST

DTC	Description	Possible Causes	Source	Perform Test
B1317	Battery Voltage High	Generator	4X4 Control Module	Go to Pinpoint Test B .
B1318	Battery Voltage Low	Blown fuse (B+) Intermittent open on power circuit 4X4 control module electrical connector(s)	4X4 Control Module	CHECK smart junction box (SJB) fuses 11 (10A) and 35 (10A). If the fuses are OK, go to Pinpoint Test B .
P1635	Tire/Axle Out of Acceptable Range	Incorrect size tire installed on vehicle Flat or under-inflated tire	4X4 Control Module	Go to Pinpoint Test H .
P1824	4WD Clutch Relay Circuit Failure	Short to ground on active torque coupling high circuit 4X4 control module failure	4X4 Control Module	CHECK SJB fuse 11 (10A). If the fuse is good, go to Pinpoint Test F .
P1825	4WD Clutch Relay Open Circuit	4X4 control module harness connector Open in active torque coupling low circuit Open in active torque coupling high circuit Short to ground on active torque coupling low circuit Short to ground on active torque coupling high circuit Open coil inside active torque coupling Short to voltage in active torque coupling low circuit 4X4 control module failure	4X4 Control Module	CHECK SJB fuse 11 (10A) and 35 (10A). If the fuses are OK, go to Pinpoint Test F .
U0100	Lost Communication with Powertrain Control Module (PCM)	Controller area network (CAN) bus fault No data received by 4X4 control module from PCM	4X4 Control Module	Go to Pinpoint Test E .
U0121	Lost Communication with Anti-lock Brake System (ABS)	CAN bus fault No data received by 4X4 control module from ABS	4X4 Control Module	Go to Pinpoint Test E .
U0401	Invalid Data Received From PCM	Invalid data received from PCM Data out of range	4X4 Control Module	Go to Pinpoint Test C .
U0415	Invalid Data Received From ABS	Invalid data received from ABS module Data out of range	4X4 Control Module	Go to Pinpoint Test D .