U0148
Lost Communication with Body Control Module "C"
The Body Control Module "C" has stopped transmitting on the vehicle data bus, so other control units no longer receive its messages. A third body controller is unreachable; its assigned body functions are affected. Typical causes are loss of power or ground at the module, an open or shorted CAN/LIN bus wire, a connector fault, or an internal module failure.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Common causes
Ordered by how often each turns out to be the cause.
- BCM-C unpoweredCommon
- CAN wiring to BCM-C brokenPossible
- Gateway module routing CAN messages incorrectlyLess likely
Parts involved
- Body Control Module
- CAN Bus Wiring
U0148 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.