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Severity: Moderate Code type: Generic (all makes)

U0126 Code: Lost Communication With Steering Angle Sensor Module

Modules no longer receive the steering wheel angle, so stability control and lane assist switch off.

Safety first · Consult a professional

  • Braking system affected: ABS may be disabled. Drive carefully and have it checked promptly.

At a glance

Severity: 3/5 – Moderate3/5

Severity: Moderate

Meaning
Lost Communication With Steering Angle Sensor Module
System
Module Communication · Network
Safe to drive?
With caution
Typical repair cost
$0–$900
DIY difficulty
Moderate

U0126 is stored by the ABS/stability module, the power steering module or a driver-assist camera when the steering angle sensor (SAS) stops sending its messages on the network. The sensor sits at the top of the steering column, usually clipped to or built into the clock spring behind the steering wheel, and reports how far and how fast the wheel is turned. Without it the car cannot compare where you are steering with where it is actually going, so electronic stability control, traction control and often lane keeping and adaptive headlights are disabled. It frequently appears after steering column, airbag or dashboard work when a connector was left loose, or after a battery went flat.

Can I keep driving? Steering and brakes still work normally, but stability control is off, so the car is less forgiving in a skid. Drive calmly on wet or icy roads and have the sensor connection checked soon.

How to read U0126

How to read U0126U10213264
  1. U Network
  2. 0 Generic (SAE)
  3. 1 Module Communication
  4. 26 Specific fault

Symptoms

  • Stability control (ESC), traction control and sometimes ABS warning lights on
  • Lane keeping assist, adaptive cruise or blind-spot features show as unavailable
  • Steering wheel angle reads blank or frozen in the scan tool data
  • Adaptive (swiveling) headlights stop turning with the steering
  • Code appeared right after column, airbag, clock spring or alignment work
  • Horn or steering wheel buttons also dead when the clock spring area is involved

Possible causes

Ranked by how often each cause is behind this code (editorial estimate).

  1. Connector at the steering angle sensor or clock spring left unplugged, half-seated or damaged during column, airbag or dash work 30%
  2. Failed steering angle sensor or clock spring assembly (worn ribbon or internal electronics) 24%
  3. Blown fuse or poor ground feeding the sensor, often shared with other column electronics 16%
  4. Low battery voltage or a recent jump start that knocked the sensor offline 14%
  5. Chafed CAN wiring in the steering column or behind the knee bolster 10%
  6. Stability/ABS module software fault after a module replacement 6%

Diagnosis step by step

Diagnostic flow: U01261Scan all modules and check steeringangle data2Ask what work was done recently3Check the fuses and battery4Inspect the sensor connector at thecolumn5Replace the sensor or clock springif power and bus are good6Calibrate the steering angle zeropoint

  1. Scan all modules and check steering angle data

    Read codes from ABS/ESC, power steering and any camera module, then open live data for steering angle. If the value is missing or frozen while you turn the wheel, the sensor is not talking; if it moves smoothly, the loss is intermittent and wiring is the stronger suspect.

    Tools: OBD-II scanner

  2. Ask what work was done recently

    Airbag, clock spring, column switch, steering rack or alignment work are classic triggers. A connector under the column shroud that was not clicked home is found in a large share of cases and costs nothing to fix.

    Tools: Flashlight

  3. Check the fuses and battery

    Find the fuse that feeds the steering column electronics in the wiring diagram and test it with a meter. Confirm the battery holds about 12.6 V and does not sag below roughly 10 V while cranking.

    Tools: Multimeter

  4. Inspect the sensor connector at the column

    Disconnect the battery and wait the time stated for the airbag system before removing the column shrouds. Check the SAS connector for pushed-out pins and a broken lock tab, and measure power, ground and both CAN lines (around 2.5 V each with the key on) at the plug.

    Tools: Screwdriver, Flashlight, Multimeter

  5. Replace the sensor or clock spring if power and bus are good

    When supply, ground and CAN signals are present but the sensor still does not answer, replace it (on many cars the SAS is part of the clock spring). Center the steering and the new part exactly as instructed so the ribbon is not torn on the first full turn.

    Tools: Screwdriver, Torque wrench

  6. Calibrate the steering angle zero point

    After any repair, alignment or sensor replacement the zero position must be taught with a scan tool, usually with the wheels straight and the engine running. An uncalibrated sensor will set its own calibration code and keep ESC disabled even though communication is restored.

    Tools: OBD-II scanner

Where the parts are

Charging system and control modules – U01261234567
Charging system and control modules
  1. 1Battery
  2. 2Alternator
  3. 3Engine computer (ECM)
  4. 4CAN bus
  5. 5Transmission
  6. 6Wheel speed sensor
  7. 7High-voltage battery

Repair options & costs

RepairDIY?Estimated cost
Reseat or repair column connector Yes $0–$150
Steering angle sensor calibration only No $80–$180
Replace steering angle sensor (incl. calibration) No $250–$650
Replace clock spring with integrated sensor (incl. calibration) No $350–$900

Rough US estimates for parts and labor; shop rates vary by region. Not a quote.

Notes by brand

Field data

Chevrolet 2 Silverado 1500

Source: NHTSA Complaints API (US government open data), analyzed by DTC mention.

Emissions / smog test impact

Depends

U0126 does not normally light the check engine light, so it rarely affects a smog check. States with a safety inspection may reject the vehicle while the stability control warning stays on.

Frequently asked questions

Why did U0126 show up right after a wheel alignment?

Aligners often recenter the steering wheel and reset the sensor, and some unplug the column or battery to do so. A disturbed connector or a sensor that lost its zero point can drop off the network or report invalid data, so have the shop recheck and recalibrate it.

Is the steering itself affected?

The mechanical steering still works. Some power steering systems reduce assist or disable active return when the angle signal is missing, but you should not lose steering control.

Can I just clear the code?

You can, but if the sensor is not answering the code returns as soon as the modules wake up again. Clearing it only helps when it was a one-off event such as a flat battery.

Does a new steering angle sensor need to be calibrated?

Yes, practically always. The modules need to learn which reading means straight ahead, and that needs a scan tool with the steering angle reset function.

Sources