Chassis, generic

C0450 Rear Wheel Steering Position Sensor Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

C0450 does not occur in the accessible J2012 lists. Its only public manufacturer use is GM: bulletin PIC5321A for the 2010–2011 Cadillac DTS links C0450 with Service Power Steering and Service Brake System messages, a lit check-engine lamp and cycling door locks, caused by an engine harness chafed through on the transmission. The DTS has no rear-wheel steering, so GM evidently uses the number for a front steering function; the bulletin does not name it. For the rear-steer meaning of the title: systems such as ZF's AKC set rear toe electrically, a patent for an electric rear-steer actuator reads ball-screw travel with Hall elements, and a ONE80 patent drives the wheels back to straight ahead and locks out rear steer once the position signal is lost or wrong.

Likely causes

Wiring harness chafed or pinched (GM DTS case at the transmission)
Faulty position sensor in the rear steering actuator
Corroded or loose connector on the actuator

Symptoms

  • Steering or brake system warning message in the cluster
  • Rear steering locked straight ahead, larger turning circle
  • Check-engine lamp on some GM models

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–1,200
Time0.5–3 h

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

Parts involved

rear steering position sensorrear steering actuatorwiring harness

Related codes

C0455C0460

References: static.nhtsa.gov, zf.com, patents.google.com, patents.google.com.