C05F4Rear Drive Shaft Speed Sensor Circuit Range/Performance
- Generic OBD-II code · Chassis
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- The rear drive shaft speed is electrically valid but does not fit the rest of the driveline. The controller can compare it with wheel speeds, the axle ratio and the clutch state: with AWD engaged the shaft must follow the rear wheels, and a reading that stays near zero, lags or runs too fast is implausible. American Axle relies on a pinion shaft speed sensor to confirm that the disconnected rear driveline has reached primary speed before a dog clutch shifts, and BorgWarner times engagement by a speed difference of about 100 to 200 rpm. A wrong reading would break exactly that check. Likely causes are an enlarged air gap, a damaged target ring, a wrong part or a slipping clutch. No maker documents C05F4; electrical faults are C05F0 to C05F3.
- What you may notice
- AWD warning and all-wheel drive disabled
- Rear axle no longer connects in a disconnecting AWD system
- Live data shows shaft speed that does not match wheel speeds
- Likely causes
- LikelyAir gap too large, sensor not fully seated or wrong spacer
- PossibleTarget ring damaged, loose or covered with metal debris
- RareWrong sensor, target ring or axle ratio after repair
- RareSlipping AWD clutch makes shaft speed deviate
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.