Chassis, generic

C0536 Motor Control B Circuit/Open

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Motor control B finds its load missing. The module expects a closed path through the windings of channel B and sees an open circuit instead – a pulled connector, a cut lead, corroded pins or an internal break in the motor. Brake controllers have run dedicated open-circuit routines for pump motors for decades, as in a Kelsey-Hayes patent (now ZF) that checks the motor circuit while the pump is not requested; current bridge driver chips like the DRV8873-Q1 from TI provide open-load detection both in standby and during operation. J2012 does not identify the motor behind B and no public manufacturer documentation of C0536 was found. Until repaired the motor stays dead and the function it serves is unavailable; compare C0531 for channel A.

Likely causes

Connector to motor B pulled off or pins corroded
Motor lead cut or broken in the harness
Internal break in motor B (winding, brush)

Symptoms

  • Warning lamp of the affected system on
  • Motor B shows no reaction

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–1,200
Time0.5–3 h

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

Parts involved

chassis motor bmotor wiring

Related codes

C0535C0537C0538C0531

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