What it means
The driveline control module compares the position signals from rear differential actuator B and sets this code when they do not agree as expected.
How it works
The driveline control module compares the position signals for rear differential actuator B to confirm that the sensors agree about actuator movement. C00A0 sets when those signals do not correlate as expected, rather than identifying a fault in only one named sensor.
Common causes
Most likely first.
- Faulty actuator position sensor
- Damaged or corroded sensor connector
- Open or shorted sensor wiring
- Rear differential actuator fault
Symptoms
- AWD or 4WD warning
- AWD may be unavailable or limited
- Rear differential may not engage or disengage correctly
How to diagnose it
- Use freeze-frame and live data to compare all available actuator B position sensor readings and identify when they begin to disagree.
- Inspect the connectors and wiring for actuator B sensors A, B, and C for corrosion, looseness, or damage.
- Observe the sensor readings while actuator B is commanded through normal operation, looking for a signal that lags, jumps, or stops tracking.
- Test the power, ground, and signal circuits for the sensor with the inconsistent reading, following the vehicle’s wiring information.
- If circuits are sound, check actuator B for binding or incomplete travel and evaluate sensor correlation using the manufacturer’s procedure.
- Clear the code and confirm the actuator B sensor readings agree during the operating conditions that set C00A0.
Common fixes
- Clean and secure the connector for the actuator B sensor with the inconsistent reading.
- Repair wiring faults affecting one of actuator B’s position sensor signals.
- Replace the faulty actuator B position sensor if its circuit checks out and its reading remains out of step.
- Repair or replace actuator B if binding or incomplete travel causes the sensor disagreement.
- Perform the manufacturer’s calibration procedure if the signals still fail to correlate after repair.
Can I keep driving?
AWD may be limited, and the rear differential may not engage or release properly. Avoid relying on AWD for slippery conditions until the actuator B sensor disagreement is resolved.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.