Chassis, generic

C0535 Motor Control B Range/Performance

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Second motor channel B fails its plausibility check: wiring and supply test fine, yet the motor's reaction to commands is wrong, for example too little speed, a delayed start or no stop. Where a controller drives two motors or two channels, A and B separate them; J2012 does not say which motor B is, and no manufacturer publicly assigns C0535, so the meaning must come from the vehicle's own service data. How such a check can work is shown by an AlliedSignal patent now held by Bosch: after shut-off a spinning DC motor acts as a generator, and a voltage collapse faster than roughly 134 V/s means it never really turned. Causes lie mostly in the motor or the driven mechanism; the channel A counterpart is C0530.

Likely causes

Driven mechanism of motor B binding or blocked
Motor B worn and too slow
Faulty speed or position feedback in the control unit

Symptoms

  • Warning lamp of the affected system on
  • Function of motor B slow, incomplete or unavailable

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,500
Time0.5–4 h

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

Parts involved

chassis motor b

Related codes

C0536C0530

References: patents.google.com, patents.google.com.