U0126 means a control module on the vehicle network can no longer communicate with the Steering Angle Sensor (SAS) module. The SAS tells systems like electronic stability and traction control where the steering wheel is pointed and how fast it is turning. Without this data, those safety systems cannot function properly and will usually turn on warning lights.
The sensor or its integrated clock spring can fail internally from wear, heat, or flexing, interrupting communication with chassis control modules.
The data and power lines running to the steering column can break, chafe, or short due to constant steering motion and vibration.
Corroded, bent, or loose terminals in the sensor or clock spring connector can cause intermittent or permanent loss of communication.
A weak battery, bad ground, or aftermarket device can disrupt CAN or LIN bus signals, triggering a one-time or recurring communication fault.
Yes, but electronic stability control, traction control, and related assists may be disabled. Drive cautiously, especially in poor road conditions.
Yes. The sensor must be calibrated to the true straight-ahead position, which requires an accurate wheel alignment to prevent warning lights and drift issues.
No. A failed PCM is an extremely unlikely cause of this specific communication code. The fault is almost always the sensor, clock spring, or wiring, and replacing the PCM usually will not fix it.
Yes. Low system voltage during starting or charging system faults can cause temporary communication errors. If no other symptoms exist, clear the code and monitor for recurrence before replacing parts.