U0114
Lost Communication With Transfer Case Control Module
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Code U0114 indicates that your vehicle's main computer has lost communication with the transfer case control module — the electronic brain that manages your four-wheel drive or all-wheel drive system. When this communication breaks down, the 4WD system typically cannot engage or disengage, leaving you without all-wheel traction when you need it.
This code is most commonly triggered by a loss of electrical power or ground to the module, which sits in a vulnerable position underneath the vehicle. Road salt, water spray, and debris can corrode connectors and wiring over time. On some vehicles, particularly those driven off-road or in harsh winter conditions, water intrusion into the module itself causes internal circuit failure.
While the vehicle is generally still drivable in two-wheel drive mode, you should have this diagnosed within the week, especially if you rely on 4WD for daily driving conditions. A mechanic will check fuses, power and ground circuits, and the CAN bus wiring before determining whether the module itself needs replacement. Module replacement typically costs $600–$900 for parts plus labor.
Severity
Symptoms
- •4WD or AWD indicator light stays on or flashes on the dashboard
- •Vehicle cannot engage or disengage four-wheel drive when requested
- •Check engine light illuminated
- •Cruise control may stop functioning
- •Noticeable loss of traction in slippery conditions due to 4WD not engaging
Likely Causes
A blown fuse, corroded ground strap, or damaged power feed wire to the transfer case module is the most common cause. The module cannot communicate on the CAN bus without stable voltage.
The transfer case module is mounted underneath the vehicle and exposed to road salt, water, and debris. Connector pins corrode or wires fray from vibration and environmental damage.
Internal circuit board failure due to moisture intrusion, heat cycling, or component fatigue can render the module unable to transmit or receive CAN bus messages.
An open circuit, short to ground, or short to power on the CAN high or CAN low lines connecting the transfer case module to the network will prevent communication.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Inspect and clean transfer case module connector pins and ground points
- Check and replace blown fuses for the transfer case circuit
- Repair or replace damaged CAN bus wiring to the transfer case module
- Replace the transfer case control module and reprogram