C05DC code meaning
4WD/AWD Clutch A Temperature Too High
What C05DC means
The calculated or measured temperature of clutch A has passed the protection limit, usually after long slipping in sand, snow or while towing. Audi stores C05DC00 in the AWD control unit of quattro ultra models: in TSB 2075681/1 the technician drives circles at full lock below 10 km/h for up to 15 minutes until the yellow four-wheel drive overheating lamp comes on, then erases the entry. Suppliers protect the clutch in steps. A BorgWarner patent cuts engine torque from 130 °C and stops at 110 °C; JTEKT estimates the oil temperature from transmitted torque and speed and lowers the target torque above a threshold; GKN's actuator controller also tracks clutch temperature. After cooling, AWD normally returns.
C05DC at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyEasy, DIY possible
- Typical labor0 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C05DC
- Yellow AWD overheating warning
- Less drive to the secondary axle until the clutch has cooled
- Engine power briefly reduced during wheel spin
Common causes of C05DC
- Most likelyLong periods of wheel slip in deep snow, sand or mud
- PossibleTowing or steep climbs with heavy load
- PossibleDifferent tire sizes or wear front to rear force constant slip
- Less likelyAged or wrong clutch fluid
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Awd clutch aAwd control module
What each part of C05DC means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| DC | The exact fault in that area. |
What to do next
- Note C05DC 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 C05DC
What does C05DC mean?
C05DC means "4WD/AWD Clutch A Temperature Too High". The calculated or measured temperature of clutch A has passed the protection limit, usually after long slipping in sand, snow or while towing. It is a generic code, so it means the same on every make.
Is it safe to drive with C05DC?
Drive gently and only to a workshop. With C05DC the car can go into limp mode (reduced power) to protect itself.
Will C05DC fail an emissions test?
C05DC 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 C05DC to fix?
Difficulty: easy. A typical repair takes 0 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will C05DC clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.