OBD-II code · Powertrain (generic, extended)
P24C9 Particulate Matter Sensor Temperature Circuit High
Same as P24C6 with the signal voltage above the plausible range. 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 P24C9?
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
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–3 h
- Emissions test
- Likely to fail
- Parts involved
- Particulate Matter Sensor
Related codes
- P24C6Particulate Matter Sensor Temperature Circuit
- P24C7Particulate Matter Sensor Temperature Circuit Range or Performance
- P24C8Particulate Matter Sensor Temperature Circuit Low
- P24CAParticulate Matter Sensor Temperature Circuit Intermittent
- P24CBReductant Tank Cap Switch Circuit
- P24CCReductant Tank Cap Switch Circuit Range or Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.