U0236 indicates the powertrain control module (PCM) has lost serial-data communication with the column-lock module. This usually means the module is not responding on the vehicle network, often due to power, ground, or internal module failure.
Internal electronics failure is the most common cause. Water intrusion, vibration, or age-related component wear can damage the module.
Open or shorted circuits between the column-lock module and the network bus, or corroded/loose connectors at the module or splice points.
Blown fuse, faulty relay, or broken power/ground wire preventing the module from powering up and communicating.
Open, short, or high resistance in the CAN or LIN bus wiring shared by multiple modules, disrupting communication.
A replacement module that is not properly programmed or calibrated for the vehicle may fail to communicate.
Only consider if all other causes are ruled out. PCM failure is extremely unlikely to cause only a single-module communication loss.
Driving is not recommended. The steering column may remain locked, creating a sudden loss of control. If the vehicle starts, the column lock may engage unexpectedly while driving.
No. The PCM is rarely the cause. U0236 almost always indicates a problem with the column-lock module itself, its wiring, or power supply. Replacing the PCM should only be considered after all other causes are ruled out.
Dealers often replace the module because it is the most common failure point. However, the issue could also be wiring, connectors, or power/ground problems. Proper diagnosis should confirm the root cause before replacement.
Clearing the code without repairs may temporarily restore function, but the underlying issue will likely return. The code will reset once the communication fault reoccurs.