OBD-II code · Powertrain (generic, extended)
P24CE Reductant Tank Cap Switch Circuit High
Same as P24CB with the signal shorted to supply. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P24CE?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal shorted to supply
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
Symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1 h
- Emissions test
- Likely to fail
- Parts involved
- Reductant Tank Cap Switch
Related codes
- P24CBReductant Tank Cap Switch Circuit
- P24CCReductant Tank Cap Switch Circuit Range or Performance
- P24CDReductant Tank Cap Switch Circuit Low
- P24CFReductant Tank Cap Switch Circuit Intermittent or Erratic
- P24D0Particulate Matter Sensor Supply Voltage Circuit Low
- P24D1Particulate Matter Sensor Regeneration Incomplete
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.