C00A0 code meaning
4WD/AWD Rear Differential Unit Actuator B Position Sensor Correlation
What C00A0 means
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.
C00A0 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyHard
- Typical labor0.3 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C00A0
- AWD fault message with rear torque control switched off
- Possible loss of related assist functions shown in the cluster
Common causes of C00A0
- Most likelyShared sensor ground or supply of actuator B faulty
- PossibleActuator B connector not fully latched
- Less likelyRotor magnet or sensor carrier shifted inside actuator B
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Rear diff actuator b pos aRear diff actuator b pos bRear diff actuator b pos c
What each part of C00A0 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| A0 | The exact fault in that area. |
What to do next
- Note C00A0 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about C00A0
What does C00A0 mean?
C00A0 means "4WD/AWD Rear Differential Unit Actuator B Position Sensor Correlation". C00A0 is the plausibility check across all three position channels of actuator B. It is a generic code, so it means the same on every make.
Is it safe to drive with C00A0?
Drive gently and only to a workshop. With C00A0 the car can go into limp mode (reduced power) to protect itself.
Will C00A0 fail an emissions test?
C00A0 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is C00A0 to fix?
Difficulty: hard. A typical repair takes 0.3 to 3 hours of work. This is a job for a workshop.
Will C00A0 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.