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 MANUALSMERCURY2011MARINER PREMIER, 2.5 7, AWDREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSDTC INDEXFOUR WHEEL DRIVE (4WD) SYSTEMS DTCS(EXCEPT HYBRID)4X4 CONTROL MODULE

2011 Mercury Mariner Premier, 2.5 7, AWD

4X4 Control Module

2011 Mercury Mariner Premier, 2.5 7, AWDSECTION 4X4 Control Module

4X4 CONTROL MODULE DIAGNOSTIC TROUBLE CODE (DTC) LIST

DTC	Description	Possible Causes	Action
B1317	Battery Voltage High	Generator	GO to PINPOINT TEST B .
B1318	Battery Voltage Low	Blown fuse (B+) Intermittent open on power circuit 4X4 control module connector	GO to PINPOINT TEST B .
B1342	PCM is Faulted	Microprocessor or internal memory fault	CLEAR the DTCs. REPEAT the self-test. If DTC B1342 is retrieved again, INSTALL a new 4X4 control module. REFER to 4X4 CONTROL MODULE in this service information.
P1635	Tire/Axle Out of Acceptable Range	Incorrect size tire installed on vehicle Wheel speed sensor failure Flat or under-inflated tire	GO to PINPOINT TEST F .
P1824	4-Wheel Drive Clutch Relay Circuit Failure	Short to ground on Active Torque Coupling (ATC) solenoid (part of rear axle) high circuit 4X4 control module failure	GO to PINPOINT TEST D .
P1825	4-Wheel Drive Clutch Relay Open Circuit	4X4 control module harness connector Open in ATC solenoid (part of rear axle) low circuit Open in ATC solenoid high circuit Short to ground on ATC solenoid low circuit Short to ground on ATC solenoid high circuit Open coil inside ATC solenoid Short to voltage in ATC solenoid low circuit 4X4 control module failure	GO to PINPOINT TEST D .
U0100	Lost Communication with PCM	Controller Area Network (CAN) bus fault No data received by 4X4 control module from PCM	REFER to MODULE COMMUNICATIONS NETWORK article to diagnose the lost communication with the PCM.
U0121	Lost Communication with Anti-lock Brake System (ABS) Control Module	CAN bus fault No data received by 4X4 control module from ABS module	REFER to MODULE COMMUNICATIONS NETWORK article to diagnose the lost communication with the ABS control module.
U0155	Lost Communication with Instrument Cluster (IC)	High Speed Controller Area Network (HS-CAN) fault No data received from the IC by the 4X4 control module	REFER to MODULE COMMUNICATIONS NETWORK article to diagnose the lost communication with the IC .
U0401	Invalid Data Received From PCM	Invalid data received from PCM Data out of range	REFER to INTRODUCTION article to diagnose the accelerator position, engine coolant or keep alive memory fault.
U0415	Invalid Data Received From Antilock Brake System (ABS) Control Module	Invalid data received from ABS module Data out of range	GO to PINPOINT TEST C .
U2050	No Application Present	Application software is not present Application software update failed 4X4 control module failed	CONFIGURE the 4X4 control module. REFER to MODULE CONFIGURATION article to CARRY OUT Programmable Module Installation (PMI). CLEAR the DTCs. RETRIEVE the DTCs and VERIFY successful module configuration. If DTC U2050 is retrieved again, INSTALL a new 4X4 control module. REFER to 4X4 CONTROL MODULE in this service information. REPEAT the self-test.
U2051	One or More Calibration Files Missing/Corrupt	Calibration software not present Calibration software update failed 4X4 control module failed	CONFIGURE the 4X4 control module. REFER to MODULE CONFIGURATION article to CARRY OUT Programmable Module Installation (PMI). CLEAR the DTCs. RETRIEVE the DTCs and VERIFY successful module configuration. If DTC U2051 is retrieved again, INSTALL a new 4X4 control module. REFER to 4X4 CONTROL MODULE in this service information. REPEAT the self-test.

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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.