P24CE code meaning
Reductant Tank Cap Switch Circuit High
Powertrain system Generic code P24xx codes Check engine light
What P24CE means
With P24CE the controller sees the DEF cap switch signal above its permitted band. On a pull-up input this typically happens when the line is open, because the input then floats up to the reference, or when it touches a supply wire; a broken switch contact can look the same. Unlike P24CD, a simple unplugged connector after tank work is a frequent trigger here. No manufacturer documents P24CE publicly. The switch itself is known from Audi's bulletin 2051053 for the 2013 to 2015 Q7 TDI, which deals with the related codes P24CB and P24CC and places the switch on the filler neck of the active tank. CARB's comprehensive component rules call for detecting such out-of-range inputs. Checking the plug and measuring the line with the switch operated settles it.
P24CE at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.3 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P24CE
- Malfunction indicator lamp on
- Refill of DEF not registered
Common causes of P24CE
- Most likelyDisconnected plug or broken wire letting the input float high
- PossibleSignal wire touching a supply line
- PossibleBroken contact inside 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 P24CE 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). |
| CE | The exact fault in that area. |
What to do next
- Note P24CE 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 P24CE
What does P24CE mean?
P24CE means "Reductant Tank Cap Switch Circuit High". With P24CE the controller sees the DEF cap switch signal above its permitted band. It is a generic code, so it means the same on every make.
Is it safe to drive with P24CE?
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 P24CE fail an emissions test?
Yes, it can. P24CE 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 P24CE to fix?
Difficulty: medium. A typical repair takes 0.3 to 3 hours of work. This is a job for a workshop.
Will P24CE clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.