C0076

Code

Generic C — Chassis

PWM for Traction Control

Brand: Generic

Type: C — Chassis

Views: UK: 27 EN: 35 RU: 36

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Page language: EN

Causes

Open or short in PWM wiring (to battery or ground)
Corroded or loose connector at actuator or module
Faulty traction-control actuator (solenoid, valve, motor)
Blown fuse or faulty relay supplying the module/actuator
Poor ground or supply voltage to ABS/traction module
Internal output driver failure in ABS/traction control module

Symptoms

Traction control/ESP warning lamp illuminated
Traction control function disabled or inactive
ABS/ESP warning lamp may also be on
Reduced vehicle stability or traction intervention not available
Possible stored additional ABS/traction codes or related faults
No normal actuator noise (pump/solenoid) when system attempts intervention

What to check

Read and record all related DTCs and freeze-frame data with scan tool
Visually inspect wiring harness and connectors at traction actuator and ABS/TC module for damage, corrosion, water intrusion, or loose pins
Check fuses and relays for ABS/traction system supply
Measure battery voltage and module supply under load
Backprobe module PWM output and actuator power/ground to check presence of supply and switching
Measure actuator coil/motor resistance and continuity

Signal parameters

Typical PWM voltage amplitude: 0 V (low) to battery voltage (high), nominally 9–14 V when high
Typical PWM frequency: commonly 50–500 Hz (varies by manufacturer)
Duty cycle range: 0–100% depending on commanded torque/braking
Expected idle/standby duty: near 0–10% (system dependent)
Expected active duty: varies dynamically; check OEM specification or known-good waveform

Diagnostic algorithm

Read stored codes and note freeze-frame/live data. Clear codes and attempt to re-create fault to confirm persistence.
Visually inspect connectors, pins and wiring for damage or corrosion at the traction actuator and ABS/TC module. Repair any obvious faults.
Verify battery voltage and check relevant fuses/relays. Repair/replace as needed.
With key on (engine off) backprobe the actuator power and ground to confirm constant supply and good ground.
Backprobe the module PWM output while commanding traction control activity (or performing a road test where safe). Use an oscilloscope to verify frequency and duty cycle are within expected ranges.
Measure actuator resistance; if open or shorted, replace actuator. If resistance is within spec, directly actuate the device (per service manual) to confirm mechanical operation.
If wiring and actuator are good but no or incorrect PWM is present, suspect module output stage failure. Check for shorts to power/ground and any related communication errors (CAN).
If module is suspected, verify with manufacturer procedures (module bench test or swap with known-good unit if available) before replacement.
After repair, clear codes and perform a road test to verify fault does not return. Re-scan to confirm no related codes remain.

Likely causes

High resistance in PWM circuit or ground
Connector corrosion or pin damage at ABS/traction module or actuator
Actuator coil/motor failed (open or short)
Module output transistor has failed
Battery voltage low or intermittent supply to module

Fault status

⚠️ Status

PWM drive for traction control is out of specification, absent, or shorted. Traction control function disabled until circuit/actuator/module fault is corrected.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours