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U0435 Invalid Data Received From Power Steering Control Module - Rear

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

U0435 refers to the rear power steering module, the controller of active rear-wheel steering. A receiver sets it when the module's status or angle frames arrive but are unusable. GM bulletin 17-NA-130 explains one case on the 2016-17 Cadillac CT6: during a remote start the rear steer module had not yet initialised while the brake module already expected its data, so the EBCM stored U0435 and showed a Service Soon message; new EBCM software is the fix. Porsche's workshop campaign WE14 for the 2014 911 Turbo reflashes both rear-axle steering units after a software error; with the fault active the actuators lock in the straight position and the car behaves like one with fixed rear links until the next ignition cycle. U0134 is lost contact; U0420 covers power steering module A.

Likely causes

Rear steering module not yet ready when receivers expect data, e.g. at remote start
Software error in rear steering or brake module
Low voltage or poor connector at the rear steering unit

Symptoms

  • Service Soon or rear steering fault message
  • Larger turning circle, rear wheels held straight

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€50–1,200
Time0.3–2.5 h

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

Parts involved

rear power steering module

Related codes

U0134U0420U0428

References: static.nhtsa.gov, static.nhtsa.gov, en.wikipedia.org.