C00A5 code meaning
Driveline Control Module Transfer Case Unit Control Circuit Driver
What C00A5 means
C00A5 concerns the output stage in the driveline module that powers the transfer case actuator, typically a DC gearmotor that shifts range and mode or presses a multi-plate clutch. Bosch describes such a transfer case clutch driven by a DC motor with worm gear through an H-bridge, with motor speed, worm wheel position and motor current measured; Magna's shift patent regulates the gearmotor speed by PWM and switches to closed-loop position control near the end of travel. The code is set when the module sees a fault at its own driver, such as overcurrent, a short to ground or battery, an open load or thermal shutdown, the categories listed for H-bridge ICs like TI's DRV8873-Q1. The actuator itself is covered by C00A6. No manufacturer publishes a C00A5 case. The transfer case then usually holds its last state or drops to 2WD.
C00A5 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C00A5
- 4WD/AWD cannot be engaged or range shift refused
- 4WD service warning in the cluster
Common causes of C00A5
- Most likelyShorted transfer case motor wiring or connector
- PossibleBinding or worn transfer case motor causing overcurrent
- Less likelyDefective H-bridge in the driveline module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Driveline moduleTransfer case
What each part of C00A5 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| A5 | The exact fault in that area. |
What to do next
- Note C00A5 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 C00A5
What does C00A5 mean?
C00A5 means "Driveline Control Module Transfer Case Unit Control Circuit Driver". C00A5 concerns the output stage in the driveline module that powers the transfer case actuator, typically a DC gearmotor that shifts range and mode or presses a multi-plate clutch. It is a generic code, so it means the same on every make.
Is it safe to drive with C00A5?
Drive gently and only to a workshop. With C00A5 the car can go into limp mode (reduced power) to protect itself.
Will C00A5 fail an emissions test?
C00A5 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 C00A5 to fix?
Difficulty: hard. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will C00A5 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.