U0429 means a control module on the vehicle network received data from the Steering Column Control Module (SCCM) that was corrupted, out-of-range, or otherwise implausible. It is a communication/validity fault, not a report that the SCCM itself necessarily failed, though a failing SCCM is the most common source. The code often appears alongside other U-codes or symptoms involving steering-column-mounted controls.
The SCCM can develop internal faults that corrupt the data packets it transmits, even if the vehicle still starts and drives. This is statistically the most likely cause for U0429.
Corroded, bent, loose, or moisture-contaminated pins and harness damage at the column can introduce noise or signal loss that makes received data invalid.
Low system voltage, weak battery, or poor grounds can cause modules to operate below specification and produce corrupted messages during cranking or high electrical load.
Shorts, opens, or high resistance in the high-speed CAN circuits can distort messages between modules and trigger invalid-data codes for the SCCM.
Incorrect or outdated SCCM calibration, or a module that lost its learned values after a battery replacement or repair, can broadcast data another module rejects.
It is possible, though uncommon, that the module logging U0429 is misinterpreting good data due to its own internal fault; this should only be considered after the SCCM, wiring, and network are ruled out.
Often yes, but steering-column switch functions, stability control, or other safety systems may behave unpredictably. It should be diagnosed promptly.
Usually no. U0429 describes invalid data coming from the Steering Column Control Module, so the fault is most commonly the SCCM, its wiring, or the network. PCM replacement is rarely the correct repair for this code.
A weak or disconnected battery can corrupt learned data or cause temporary communication errors. However, if the code persists after proper charging and a steering-angle reset, a hardware issue is more likely.
If the SCCM contains the steering-angle sensor, a reset or calibration may be required after repairs or battery disconnection; follow the service procedure for the specific vehicle.