P24CC code meaning
Reductant Tank Cap Switch Circuit Range/Performance
Powertrain system Generic code P24xx codes Check engine light
What P24CC means
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.
P24CC at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P24CC
- Malfunction indicator lamp on after a DEF refill
- Fill level or refill message not updated
Common causes of P24CC
- Most likelySwitch stuck in one position so it no longer follows the cap
- PossibleDEF residue hindering the switch plunger
- Less likelyDamaged or non-original filler cap that does not actuate the switch
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Reductant tank cap switch
What each part of P24CC means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| CC | The exact fault in that area. |
What to do next
- Note P24CC 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 P24CC
What does P24CC mean?
P24CC means "Reductant Tank Cap Switch Circuit Range/Performance". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P24CC?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P24CC fail an emissions test?
Yes, it can. P24CC is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P24CC to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P24CC clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.