U0114 Lost Communication With Four-Wheel Drive Clutch Control Module

U0114 sets when the reporting module stops receiving expected messages from the four-wheel drive clutch control module. The module may be dead, unpowered, or simply unable to reach the network — the code cannot tell those apart on its own.

Code details

Generic OBD-II · U0

System: Transmission
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not order the four-wheel drive clutch control module on the strength of this code. Lost communication is a symptom of power, ground, wiring or network trouble far more often than it is a failed controller, and a replacement will be just as silent on a broken circuit.

Symptoms of U0114

Harsh, delayed, or slipping shifts, or being stuck in one gear.
Check-engine light, sometimes with limp-home mode.
Flaring RPM or a shudder under load.

Common causes of U0114

Low or degraded transmission fluid.
A failing speed sensor, shift solenoid, or pressure-control circuit.
Wiring, connector, or internal hydraulic/mechanical faults.

Useful checks before replacing parts

Check power and ground at the four-wheel drive clutch control module first, including its fuses and any relay that feeds it, because an unpowered module is silent in exactly the same way as a failed one.
Establish whether one module is missing from the network or several are, since a whole missing segment points at bus wiring or a gateway rather than at the named controller.
Load-test the battery and check charging voltage before anything else, because low system voltage drops modules offline and sets communication codes across unrelated systems.

Related OBD-II codes

These nearby transmission entries can help compare wording and pin down the fault area.