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DTC codes / U01xx · Lost communication with a control module / U0126

U0126Lost Communication With Steering Angle Sensor Module

U0126 means the vehicle's main computers have lost the data signal from the steering angle sensor module over the controller area network (CAN) bus. The module that monitors the network, usually the electronic stability control or body control module, has stopped receiving the periodic messages that tell it where the steering wheel is pointed.

SystemNetwork
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaLost communication with a control module

Symptoms you may notice

  • The antilock brake system (ABS) and electronic stability control (ESC) warning lights illuminate steadily.
  • The traction control and hill assist features are disabled, and the dashboard may display a message to service the stability system.
  • The power steering assist may default to a heavier effort or a fixed mode if the vehicle uses an electric steering column module.
  • The speedometer and other dashboard gauges continue to work normally because the fault is isolated to the steering angle network.
  • Often no symptoms besides the warning light, because the vehicle remains fully drivable without stability control intervention.

Common causes, most likely first

  1. A failed or intermittent steering angle sensor module, which is the most common cause on high-mileage vehicles.
  2. Corroded, loose, or damaged electrical connectors at the steering angle sensor or the module it communicates through.
  3. A break or short in the CAN bus wiring between the steering angle sensor module and the rest of the network.
  4. Low battery voltage or a weak charging system that causes the steering angle module to drop offline intermittently.
  5. A faulty clock spring inside the steering column that interrupts power or ground to the steering angle sensor.
  6. A software or calibration issue in the steering angle module after battery replacement or suspension work.
  7. A failed network gateway or body control module that stops relaying messages from the steering angle sensor.

How to diagnose and fix it

  1. Connect a scan tool and read all stored codes in every module, then record the exact network status of the steering angle sensor module.
  2. Inspect the battery voltage and charging system output, because low voltage is a frequent cause of intermittent communication loss.
  3. Locate the steering angle sensor module and check its connectors for corrosion, pushed pins, or loose terminals, then clean and reseat them.
  4. Perform a wiggle test on the wiring harness between the steering angle sensor and the CAN bus while watching live data for dropouts.
  5. Check the CAN bus resistance and voltage levels at the diagnostic connector to confirm the network is healthy outside the steering angle module.
  6. If wiring and power are good, substitute a known-good steering angle sensor module or perform a calibration relearn with the scan tool.
  7. After any repair, clear the codes and perform a steering angle sensor calibration and a road test to confirm the stability system returns to normal.

Why the steering angle module drops offline

  • A weak battery or a failing alternator often sets U0126 before any hard steering angle fault appears, so always load-test the charging system first.
  • The clock spring is a wear item that carries power and ground to the steering angle sensor, and a partially broken clock spring can cause intermittent U0126 without a steering wheel airbag fault.
  • After a wheel alignment or steering column repair, the steering angle sensor may need a calibration relearn, and skipping that step can set U0126 even though the hardware is fine.
  • U0126 does not always mean the steering angle sensor itself has failed; a single corroded connector pin anywhere on the CAN bus segment can take the module offline.
  • Some vehicles store U0126 as a history code after a brief voltage dip during engine cranking, and the code may not return once cleared if the battery is healthy.

Can I keep driving with U0126?

The vehicle remains drivable because the steering angle sensor only supports stability and traction control, but you should avoid aggressive cornering, towing, or slippery conditions until the fault is repaired. If the power steering assist feels heavy or inconsistent, have the vehicle inspected before continuing to drive.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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