C00A8 code meaning
4WD/AWD Transfer Case Unit Actuator Position Sensor B
Chassis system Generic code C00xx codes Check engine light
What C00A8 means
C00A8 is the second position signal of the transfer case actuator. Whether B is a redundant copy of A or tracks a different part, the motor or the cam, is not published by any maker; BorgWarner, for example, puts a contact probe on the shift drum cam instead of the motor because a torsion spring sits in between, and reads five plateaus from 2WD high to 4WD low. Stellantis lists C00A8-13, circuit open, in TSB 08-237-23 and in 08-122-24, which replaced 08-239-23 for 2023 Wagoneer and Grand Wagoneer built 16 to 24 June 2023: the MIL must be on, and a loose shift motor connector is the cause, verified by pushing, pulling and pushing the plug again. Ford SSM 52152 names C00A8:11 and :13 on 2020–2023 Explorer/Aviator. Magna's Hall sensor patent shows a sensor that can be exchanged from outside.
C00A8 at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.3 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C00A8
- MIL illuminated (Stellantis), wrench indicator (Ford)
- 4WD Service light, four-wheel drive not available
Common causes of C00A8
- Most likelyShift motor connector not latched (Stellantis 2023)
- PossibleHarness damage at the heat shield near the transfer case (Ford)
- Less likelyPosition sensor B defective
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Transfer case actuator pos b
What each part of C00A8 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| A8 | The exact fault in that area. |
What to do next
- Note C00A8 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 C00A8
What does C00A8 mean?
C00A8 means "4WD/AWD Transfer Case Unit Actuator Position Sensor B". C00A8 is the second position signal of the transfer case actuator. It is a generic code, so it means the same on every make.
Is it safe to drive with C00A8?
Drive gently and only to a workshop. With C00A8 the car can go into limp mode (reduced power) to protect itself.
Will C00A8 fail an emissions test?
C00A8 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 C00A8 to fix?
Difficulty: medium. A typical repair takes 0.3 to 3 hours of work. This is a job for a workshop.
Will C00A8 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.