C00A04WD/AWD Rear Differential Unit Actuator B Position Sensor Correlation
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C00A0 is the plausibility check across all three position channels of actuator B. Each line may be intact, but the pattern they form is impossible, out of sequence or contradicts the commanded movement, so the controller can no longer trust where the second actuator stands. Woodward lists 000 and 111 as illegal states for 120-degree spacing and 101 or 010 for 60-degree spacing. A Hyundai Kefico patent uses all-zero and all-one readings to tell an open line from a short. Common roots are a shared ground or supply problem, a connector that is not latched, or a magnet that has shifted. Ford reports the sister code C009C for actuator A on the Bronco Sport, but no manufacturer publishes a C00A0 case. GKN notes that its actuator controllers include self-diagnostics.
- What you may notice
- AWD fault message with rear torque control switched off
- Possible loss of related assist functions shown in the cluster
- Likely causes
- LikelyShared sensor ground or supply of actuator B faulty
- PossibleActuator B connector not fully latched
- RareRotor magnet or sensor carrier shifted inside actuator B
- Repair
- Hard · Usually a job for a workshop.Typical cost: €60 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.