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DTC codes / C06xx · Brakes, steering and suspension / C0606

C0606Steering Wheel Angle Sensor Circuit Low

C0606 indicates that the steering wheel angle sensor, which reports the driver's steering input to the stability control system, is sending a voltage signal below the normal range. The control module detects this low voltage and stores the code, often disabling stability control and sometimes the power steering assist.

SystemChassis
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaBrakes, steering and suspension

Symptoms you may notice

  • Traction control or stability control warning light illuminated on the dashboard
  • Power steering warning light on, with reduced or heavy steering assist
  • Steering feel becomes heavier or inconsistent, especially at low speeds
  • Stability control system may not activate during evasive maneuvers
  • Often no symptoms besides the warning light, with normal steering behavior

Common causes, most likely first

  1. Faulty steering wheel angle sensor due to internal wear or contamination
  2. Damaged or corroded wiring harness between the sensor and control module
  3. Poor electrical connection at the sensor connector or control module
  4. Failed clock spring (spiral cable) interrupting the sensor signal
  5. Low system voltage or a weak battery affecting sensor reference voltage
  6. Water intrusion or debris in the sensor housing causing a short to ground

How to diagnose and fix it

  1. Verify battery voltage and charging system output; a weak battery can cause false low-voltage codes
  2. Inspect the steering wheel angle sensor connector and wiring for corrosion, chafing, or loose pins
  3. Check the clock spring for continuity and damage, as it carries the sensor signal
  4. Measure the sensor reference voltage and ground at the connector with a multimeter
  5. Perform a steering angle sensor calibration or relearn procedure with a scan tool after any repair
  6. Replace the steering wheel angle sensor if voltage checks confirm it is faulty
  7. Clear the code and test-drive to confirm the repair and ensure no other codes return

Before you replace the steering angle sensor

  • A low voltage code often stems from a bad ground or corroded connector rather than the sensor itself, so always check wiring first.
  • The clock spring is a common failure point that can interrupt the sensor signal, and it may also affect horn and airbag circuits.
  • After replacing the sensor or clock spring, a calibration with a scan tool is mandatory; otherwise the code may reset immediately.
  • Low system voltage from a failing battery or alternator can trigger this code even when the sensor is healthy.
  • Some vehicles require the steering angle sensor to be initialized after any alignment or steering column work, or the code will set.

Can I keep driving with C0606?

You can usually drive the vehicle, but stability control and possibly power steering assist may be disabled, increasing the risk of loss of control in emergency maneuvers. Avoid aggressive driving and have the fault diagnosed promptly, especially if steering assist is reduced.

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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