Chassis, generic

C0532 Motor Control A Circuit High

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Motor control A reads high: a motor output sits near supply voltage although the driver commands it low or off. That points to a short to battery voltage in the motor leads or a high-side switch that no longer opens. J2012 leaves the motor unnamed and no manufacturer publication assigning C0532 was found. Bosch's US5329238 compares each terminal with limits scaled to the measured supply and treats an exceeded upper limit as a short to plus, after which drive is cut in one or both directions; TI's DRV8873-Q1 guards against shorts to battery with overcurrent protection that disables the affected half-bridge. If the motor stays energised it may run on or overheat; otherwise the function simply drops out with its warning lamp.

Likely causes

Motor lead chafed against a live wire
High-side switch in the control unit stuck on
Moisture bridging pins in the connector

Symptoms

  • Warning lamp of the affected system on
  • Motor A runs on or gets hot

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 amotor wiring

Related codes

C0531C0533C0537

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