P24CA code meaning
Particulate Matter Sensor Temperature Circuit Intermittent
Powertrain system Generic code P24xx codes Check engine light
What P24CA means
P24CA is reserved for a PM sensor temperature reading that fails only now and then instead of staying out of range. No manufacturer documents this code publicly. For comparison, Ford's 2023 diesel summary treats any temperature signal outside 0.3 to 3 V for 2 s as P24C6, and GM's 25OBDG04A table uses a counter of 24 failures within 96 samples for P24C9, so short glitches can stay below those limits. CARB requires circuit faults of PM sensors to be detected. Intermittent faults of this kind usually come from a cracked solder joint, a connector that loosens with heat or a lead that chafes on the exhaust. The warning lamp may come and go, and while the reading is doubtful the soot filter check is put on hold. P24C6, P24C8 and P24C9 are the steady faults.
P24CA at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P24CA
- Malfunction indicator lamp coming and going
- Particulate filter monitor does not complete
Common causes of P24CA
- Most likelyConnector loosening when hot
- PossibleLead chafing on the exhaust
- Less likelyCracked joint inside the sensor lead
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Particulate matter sensor
What each part of P24CA 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). |
| CA | The exact fault in that area. |
What to do next
- Note P24CA 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 P24CA
What does P24CA mean?
P24CA means "Particulate Matter Sensor Temperature Circuit Intermittent". P24CA is reserved for a PM sensor temperature reading that fails only now and then instead of staying out of range. It is a generic code, so it means the same on every make.
Is it safe to drive with P24CA?
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 P24CA fail an emissions test?
Yes, it can. P24CA 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 P24CA to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P24CA 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.