Code
C0536
Generic
C — Chassis
Motor Control B Circuit/Open
AI status
Completed
Completed
100%
Causes
- Open or damaged wiring in the Motor Control B harness
- Corroded, loose or pushed-out connector pins
- Blown fuse or failed relay supplying the motor circuit
- Faulty motor (open winding or internal failure)
- Poor or lost ground connection
- Faulty ABS/traction control or motor control module
Symptoms
- ABS/traction control warning lamp illuminated
- Reduced or altered ABS/traction control function
- Associated braking or stability features disabled
- No audible or visible operation from the affected motor when commanded
- Stored freeze-frame data and related fault codes
What to check
- Read and record all stored codes and freeze-frame data with a scan tool
- Attempt an active test (command motor) from the diagnostic tool if available
- Visually inspect harness and connectors for damage, corrosion, or water intrusion
- Check relevant fuses and relays for continuity and correct operation
- Backprobe connector at the motor and at the module to verify presence of power and ground
- Measure continuity and resistance of motor supply circuit from motor connector back to module
Signal parameters
- Supply voltage at motor connector: approx. battery voltage (~12 V) when power feed is present
- Motor coil resistance: low ohms expected (continuity present). Infinite/very high = open circuit
- Control signal: PWM or switched output from module (frequency may vary by system)
- No-voltage condition at motor output or infinite resistance indicates open circuit
- When commanded ON, measure current draw — moderate amps expected; zero amps suggests open circuit
Diagnostic algorithm
- Retrieve freeze-frame and related codes. Note conditions when fault occurred.
- Inspect visible wiring and connectors for damage, corrosion, or water entry; repair as needed.
- With ignition on (and vehicle supported safely), backprobe motor connector: verify battery voltage on supply pin and good ground on ground pin.
- Command Motor B ON via scan tool while monitoring backprobe: verify control signal (voltage or PWM) reaches the motor. If control signal present but motor does not run, suspect motor or open in motor winding.
- If no control signal at the motor connector, trace continuity from the module to the connector. Repair any open or high-resistance sections.
- Check fuses/relays that supply the motor circuit; replace if faulty. Verify module power/ground circuits.
- Bench-test motor by disconnecting it and applying a known safe supply (observe polarity and current limits). If the motor fails to run, replace motor.
- If wiring and motor test good, suspect module output driver fault. Confirm with module-level diagnostics or replace module per manufacturer procedure.
- After repairs, clear codes and perform road/functional test to confirm the fault does not return.
Likely causes
- Broken or disconnected wire between module and motor
- Corroded connector terminals at motor or module
- Motor windings are open (motor failure)
- Supply fuse or relay failed
- Module output driver failed
Fault status
Status
C0536 — Motor Control B Circuit/Open: Open circuit detected in Motor Control B. Inspect wiring, connectors, fuses/relays, motor, and control module.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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