U0126 Code: Lost Communication With Steering Angle Sensor Module

on

The U0126 diagnostic trouble code (DTC) indicates a loss of communication with the Steering Angle Sensor Module (SAS). This code means that one or more vehicle control modules cannot communicate with the steering angle sensor through the CAN network.

Code Description

U0126 is a network communication fault code related to the Steering Angle Sensor Module. The sensor provides steering position information used by ABS, traction control, and electronic stability control systems.

Meaning of the Code

U0126 means the vehicle modules have lost communication with the steering angle sensor module. This communication normally occurs through the Controller Area Network (CAN) bus.

  • ABS System
  • Electronic Stability Control (ESC)
  • Traction Control System (TCS)
  • Driver Assistance Systems

Common Symptoms

  • ABS warning light ON
  • Traction control warning light
  • Stability control warning message
  • Loss of steering angle data
  • Vehicle stability systems disabled
  • ADAS features may stop working

Possible Causes

  • Faulty steering angle sensor module
  • Damaged CAN High or CAN Low wiring
  • Loose or corroded connectors
  • Low battery voltage
  • Blown fuse supplying the module
  • Faulty ABS or body control module

How Serious Is It?

Severity: Moderate to High
The vehicle may continue driving, but important safety systems such as ABS, traction control, and stability control may not operate correctly.

Diagnostic Steps

  1. Scan all vehicle modules and save all stored DTC codes.
  2. Check battery voltage and charging system.
  3. Inspect steering angle sensor connectors.
  4. Check CAN bus wiring for damage or corrosion.
  5. Verify module power and ground circuits.
  6. Check live steering angle sensor data with a scan tool.
  7. Perform steering angle sensor calibration if required.

Common Repairs

  • Repair damaged CAN wiring
  • Replace damaged connectors
  • Replace steering angle sensor module
  • Repair power or ground circuits
  • Replace and program faulty modules
  • Perform sensor calibration

Repair Cost

Repair Estimated Cost
CAN wiring repair $50 - $200
Connector repair $50 - $150
Steering angle sensor replacement $200 - $800
Module replacement/programming $500 - $1500

FAQ

Can I drive with a U0126 code?

You may be able to drive, but stability and traction safety systems may not function correctly.

What causes U0126?

The most common causes are CAN communication faults, wiring problems, low voltage, or a failed steering angle sensor.

Does replacing the sensor always fix U0126?

No. The communication network, power supply, and wiring should be tested before replacing parts.

How do I clear U0126?

Repair the cause first, then clear the code using an OBD-II scanner and verify communication returns.

Related Codes

  • U0121 - Lost Communication With ABS Control Module
  • U0100 - Lost Communication With ECM/PCM
  • U0122 - Lost Communication With Vehicle Dynamics Control Module

Conclusion

The U0126 code indicates a communication failure with the steering angle sensor module. A proper diagnosis should focus on CAN network integrity, wiring, power supply, and module operation before replacing components.

Comments

Post a Comment