This code indicates the powertrain control module has lost communication with the rear entertainment control module over the CAN bus network. This typically affects rear seat video screens, auxiliary inputs, or rear audio functions. The module may have failed, lost power, or has a wiring fault in the communication lines.
The communication circuits between the PCM and rear module may have physical damage from routing through door jambs, under seats, or cargo areas, resulting in opens, shorts, or chafing.
Moisture intrusion or loose terminal connections at the rear entertainment module or harness junctions interrupt data transmission on the network lines.
The module may suffer from internal circuit board faults, software corruption, or internal power supply issues preventing it from communicating on the bus.
Blown fuses, corroded ground points, or voltage drops prevent the module from powering up to establish communication, even if the network wiring is intact.
Rare short circuits in the high-speed or low-speed CAN lines affecting only this module's branch can pull the network voltage out of specification.
Extremely unlikely; the PCM rarely fails to communicate with only one specific module while operating normally otherwise. This should be the last component considered after all wiring and the entertainment module are verified good.
Yes. This code affects only the rear entertainment system and does not impact engine performance, braking, or safety systems. The vehicle remains safe to operate.
No. PCM failure causing loss of communication with only the rear entertainment module is extremely rare. Exhaustively check wiring, connectors, and the entertainment module itself before considering PCM replacement.
Intermittent U0196 usually indicates loose connectors, wire chafing that contacts metal only during vibration, or failing solder joints inside the entertainment module that lose connection when temperature changes.
Disconnecting the battery may clear the code temporarily, but it will return if the underlying wiring fault, power issue, or module failure persists.