Code U0156 indicates that the vehicle's primary control module has lost communication with the Information Center, typically the instrument cluster or central display module. This occurs when the expected data packets on the CAN bus network are not received within a specific timeframe.
A blown fuse or failed relay cutting power to the Information Center module.
Corroded, chafed, or broken CAN bus wiring between the module and the gateway.
Poor electrical contact at the Information Center's wiring harness connector due to vibration or corrosion.
Hardware failure within the Information Center/Instrument Cluster electronics.
A short in another module on the same network causing communication noise or a bus-off state.
Internal failure of the PCM or BCM preventing it from processing network data.
No. While the PCM reports the loss of communication, the failure is almost always located in the Information Center itself, its wiring, or its power supply.
Yes, low system voltage during the vehicle start-up sequence can cause modules to fail to initialize, leading to temporary communication timeouts.
The vehicle is usually mechanically safe, but it is dangerous if the speedometer or critical warning lights are non-functional.