Code Definition

U110B — Lost Communication With Powertrain Control Module (PCM)

System: Network Communication  |  Type: Manufacturer-Specific  |  Make: Jeep

About U110B

U110B is a manufacturer-specific network communication diagnostic trouble code recorded for Jeep vehicles. It belongs to the U-prefix family of codes, which covers inter-module network communication (CAN, LIN, FlexRay, or similar) faults.

Scanning & clearing: Network (U) codes report communication faults between modules. When diagnosing U-codes, checking the vehicle's CAN bus integrity, supply/ground at each module, and reading all modules for related faults is usually the first step.

U110B is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Powertrain Control Module (PCM) broadcasts engine, torque, and operating status on the CAN data network so that modules such as the Body Control Module, ABS and stability module, instrument cluster, and transmission controller can coordinate with the engine. DTC U110B is a manufacturer specific network code set when a receiving module stops receiving valid CAN messages from the PCM for a calibrated period while the ignition is on. Because so many systems depend on the PCM, a true loss of its messages is significant and usually traces to PCM power, ground, or its connection to the bus rathe...

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