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U0134 Lost Communication With Power Steering Control Module - Rear

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0134 is stored when a controller loses contact with the rear power steering control module, the actuator unit of a rear-wheel or four-wheel steering system. Such systems turn the rear wheels by a few degrees, opposite to the front ones at low speed for a smaller turning circle and in the same direction at higher speed for calmer lane changes. No manufacturer explains U0134 in a publicly available document. CARB obliges manufacturers to detect missing communication from digital inputs as a separate fault, while electronic steering only falls under OBD monitoring where other diagnostics depend on it, so the code is mainly a chassis matter. U0131 belongs to the front steering, U0435 to invalid rear-steer data. Usually the rear wheels stay centred.

Likely causes

Fuse, supply, ground or CAN wiring of the rear steering module faulty
Corroded or wet connector at the rear axle actuator
Rear steering control module internally faulty

Symptoms

  • Steering system warning lamp or message
  • Larger turning circle, rear wheels no longer steer

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–2,500
Time0.5–5 h

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

Parts involved

rear power steering modulecan bus wiring

Related codes

U0435U0131U0126

References: law.cornell.edu, en.wikipedia.org.