Chassis, generic

C0605 Steering Wheel Angle Sensor Circuit/Open

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

The steering wheel angle sensor tells the stability system how far and how quickly the driver turns. C0605 means its circuit is open or no usable signal arrives at all: a broken supply, ground or signal wire, an unplugged connector or a dead sensor. In a Bosch patent for a PWM-output sensor, the control unit treats the signal as missing when no high level appears within one PWM period; a Kelsey-Hayes patent declares an open or short once the phase lines stay out of range for about 5 ms and blocks yaw control. Bosch's GMR sensor today sends angle and rate over CAN. No maker publishes C0605 with this meaning; GM's PI0954 used C0605 on the 2010 Buick LaCrosse for a suspension accelerometer, an unrelated older assignment.

Likely causes

Connector at the steering column loose or not latched after airbag or column work
Broken supply, ground or signal wire in the column harness
Steering angle sensor electronics failed

Symptoms

  • ESC/stability control warning lamp on, system off
  • Traction control and lane or parking assistants may be unavailable
  • Steering angle reads zero or not available in scan data

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€40–500
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

steering angle sensorabs control module

Related codes

C0606C0607C0608C0526U0126

References: patents.google.com, patents.google.com, bosch-mobility.com, static.nhtsa.gov.