P24CCReductant Tank Cap Switch Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P24CC is a plausibility fault: the cap switch at the DEF filler neck delivers an electrically valid signal, but its behaviour does not match what else the controller knows, for instance a switch that still reports an open cap long after refilling, or one that never changes state while the tank level clearly rose. Audi names the code in bulletin 2051053 (and its revision) for the 2013 to 2015 Q7 TDI, where the AdBlue cap switch on the active tank sticks in hot, humid climates; the bulletin lists it as P24CC00 next to P24CB00 and replaces the switch with an improved part after removing the tank. Because wiring checks pass, the stuck switch itself is the prime suspect. P24CB covers general circuit faults, P24CD and P24CE the electrical extremes.
- What you may notice
- Malfunction indicator lamp on after a DEF refill
- Fill level or refill message not updated
- Likely causes
- LikelySwitch stuck in one position so it no longer follows the cap
- PossibleDEF residue hindering the switch plunger
- RareDamaged or non-original filler cap that does not actuate the switch
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.