U0114

Code

Generic U — Network/User

Lost Communication With Four-Wheel Drive Clutch Control Module

Brand: Generic

Type: U — Network/User

Views: UK: 39 EN: 170 RU: 69

AI status

Completed

ready

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Page language: EN

Causes

4WD clutch control module failure
Open, shorted or intermittent wiring on module power, ground, or CAN bus
Blown fuse or relay supplying module power
Poor or corroded connector(s) at the module or junctions
CAN bus termination fault or short to battery/ground
Battery or low system voltage / weak charging system

Symptoms

4WD system inoperative or stuck in 2WD/limited mode
4WD, check 4WD, traction or MIL warning lamps illuminated
No 4WD clutch module data or PID values available on a scan tool
Inability to change drive modes from driver controls
Intermittent 4WD operation or loss of remote/configurable 4WD functions
Other network modules reporting communication errors

What to check

Retrieve all stored and pending codes from all control modules with a capable scan tool
Confirm whether the 4WD clutch control module is present/listed in the scan tool module list
Clear codes and attempt to re-create the fault to verify persistence
Check vehicle battery voltage and charging system (low voltage can cause communication faults)
Inspect & verify fuses/relays supplying power to the 4WD clutch control module
Visually inspect module connectors and wiring for corrosion, damage, pin push-out, or water contamination

Signal parameters

CAN bus type: two-wire differential (CAN_H and CAN_L)
Expected idle (recessive) voltage: ~2.5 V on each CAN line (vehicle-specific)
Dominant state: typically results in a differential voltage (use scope for exact values)
Typical CAN data rates in 4WD networks: commonly 125 kbps to 500 kbps (vehicle-specific)
Expected CAN traffic: periodic messages from 4WD clutch module when awake (frequency varies by vehicle; often multiple Hz to tens of Hz)
Termination: combined resistance ~60 ohms across CAN_H and CAN_L (two 120-ohm terminators in parallel)

Diagnostic algorithm

Connect a professional scan tool and record all current and pending codes from all modules; note which modules appear on the network
Verify module presence: confirm the scan tool can enumerate or communicate with the 4WD clutch control module; attempt to request live data/PIDs
Check vehicle battery voltage (key on engine off and during cranking) and ensure it is within normal limits; recharge or replace if low
Inspect fuses and relays that supply the 4WD clutch module; replace any blown fuses and test again
Perform a visual inspection of the 4WD module connector and harness for corrosion, bent pins, or water ingress; repair or clean as needed
Measure key power and ground at the module connector with the harness connected; key ON should show battery voltage on power circuits and low resistance to ground on ground circuits
With ignition ON, observe CAN_H and CAN_L at the module connector with a lab scope or high-speed multimeter: verify expected idle voltages and active data pulses; compare to a known good node if available
If no CAN activity at the module but present at other nodes, trace wiring between the module and the nearest gateway/ECU for opens, shorts to power/ground, or damaged shielding; repair wiring as needed
Measure termination resistance across CAN_H and CAN_L at the connector (ignition off) to confirm ~60 ohms; if open or very low, inspect for missing terminator or short
Perform a wiggle test of harness and connectors while watching for changes in communication with the scan tool to identify intermittent faults
If wiring, power and bus integrity are confirmed but module does not respond, check service information for required software updates or reprogramming; replace module only after confirming replacement and programming procedures
After repairs, clear DTCs, cycle ignition, and verify that the module appears on the network and the U0114 code does not return; road test as required

Likely causes

Loss of module power or ground (fuse, wiring, connector)
Damaged or shorted CAN high/low wiring between module and network
Corroded connector pins or water intrusion at module harness
Failed 4WD clutch control module
Network termination or grounding fault causing bus silence
Aftermarket device or recent service disturbed network wiring or module programming

Fault status

⚠️ Status

No communication received from the Four-Wheel Drive Clutch Control Module on the vehicle data bus. Module does not respond to network requests or fails to transmit expected messages.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours