Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSVOLKSWAGEN2010ROUTAN SREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 883 (FOUR WHEEL DRIVE (4WD) SYSTEMS)DIAGNOSTIC TESTSFOUR WHEEL DRIVE (4WD) SYSTEMS4X4 CONTROL MODULE DTC CHART

2010 Volkswagen Routan S

4X4 Control Module DTC Chart

2010 Volkswagen Routan SSECTION 4X4 Control Module DTC Chart

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

DTC	Description	Possible Causes	Source	Action
B1317	Battery Voltage High	Concern with voltage regulator on generator	4X4 Control Module	Go to Pinpoint Test B .
B1318	Battery Voltage Low	Blown fuse (B+) Intermittent open on power circuit Relay failure inside module	4X4 Control Module	Go to Pinpoint Test B .
B1342	ECU is Defective	Microprocessor or internal memory fault	4X4 Control Module	CLEAR the DTCs. REPEAT the self-test. If DTC B1342 is retrieved again, INSTALL a new 4X4 control module. REFER to 4X4 Control Module .
P1635	Tire/Axle Out of Acceptable Range	Wrong size tire installed on vehicle Wheel speed sensor failure Flat or under inflated tire	4X4 Control Module	Go to Pinpoint Test I .
P1824	4WD Clutch Relay Circuit Failure	Short to ground on active torque coupling high circuit Electronic control unit (ECU) failure	4X4 Control Module	CHECK SJB fuse 18 (10A). If the fuse is good, go to Pinpoint Test F .
P1825	4WD Clutch Relay Open Circuit	Short to ground on active torque coupling high circuit Short to ground on active torque coupling low circuit Open coil inside active torque coupling Open in active torque coupling low circuit Short to voltage in active torque coupling low circuit ECU failure	4X4 Control Module	CHECK SJB fuse 18 (10A). If the fuse is good, go to Pinpoint Test F .
U0100	Lost Communication with 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 .
U1900	CAN Communication Bus Fault	CAN bus fault	4X4 Control Module	Go to Pinpoint Test E .

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.