Code U0231 indicates that the vehicle's onboard diagnostic system has detected a loss of communication with the Rain Sensing Module. This means the module is not sending or receiving data over the vehicle's communication network, typically disabling automatic wiper functions.
Internal electronic failure within the module prevents it from communicating with the rest of the vehicle network.
Frayed, broken, or corroded wires between the module and the communication bus disrupt signal transmission.
A blown fuse or faulty ground connection prevents the module from powering on.
Loose or oxidized pins at the module connector create an open circuit or high resistance.
Other faults on the communication network may be blocking the data stream from the rain sensor.
A failure in the Body Control Module (BCM) or PCM that manages the network interface, though this is rare.
No. U0231 is specifically related to the rain sensing module. It is highly unlikely that the PCM is the cause; the issue is almost always the module itself, its power supply, or the wiring.
Yes. If the rain sensor is not properly seated against the new glass or if the sensor was damaged during the installation process, communication errors may occur.
Usually not. In most vehicles, manual wiper controls are designed to operate independently of the rain sensing module as a fail-safe.