C05F0Rear Drive Shaft Speed Sensor Circuit Low
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- The signal of the rear drive shaft speed sensor stays below its valid range, typically due to an open circuit, a short to ground or a missing sensor supply. The AWD module needs this speed to match a disconnected rear driveline to the wheels before a clutch closes; American Axle's patent feeds a pinion shaft speed sensor into exactly that synchronisation check. Audi lists the driveshaft speed sensor G970 among the parts tested in quattro ultra fault finding for C05ED00. Many such sensors are two-wire Hall ICs that toggle between two supply currents; Allegro's A19420 uses about 7 and 14 mA, so a current below the lower band, or none at all, cannot be a valid pulse. No manufacturer publishes C05F0 itself; C05F1 is the high counterpart.
- What you may notice
- AWD warning, all-wheel drive not connected
- Vehicle drives in front-wheel drive only
- Likely causes
- LikelyOpen sensor wire or loose connector
- PossibleSignal or supply line shorted to ground
- PossibleFailed Hall sensor IC
- Repair
- Medium · Often possible to do yourself.Typical cost: €50 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.