P24CEReductant Tank Cap Switch Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- 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.
- What you may notice
- Malfunction indicator lamp on
- Refill of DEF not registered
- Likely causes
- LikelyDisconnected plug or broken wire letting the input float high
- PossibleSignal wire touching a supply line
- PossibleBroken contact inside 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: €50 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.