P24C2 code meaning
Exhaust Gas Temperature Measurement System - Multiple Sensor Correlation Bank 1
Powertrain system Generic code P24xx codes Check engine light
What P24C2 means
Diesel exhaust lines often carry three or four temperature probes in a row, ahead of the oxidation catalyst, the particulate filter and the SCR catalyst. P24C2 says that on bank 1 the readings of these probes no longer agree with each other, without pinning the error on one of them. Ford's 2023 diesel summary uses it in its EGT plausibility check: after a soak of at least six hours with the engine stopped, all probes should read alike at key-on (limit 50 °C), and during the following 200 to 400 s each probe is compared with a model (±80 °C), with a fault having to persist for 20 s. Ram lists the code in bulletin 18-028-14 for the 2014 Ram 1500 with the 3.0 L diesel, cured by new PCM software. Single-probe faults are P2080, P2084, P242B and P246F. Filter regeneration may be held back.
P24C2 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P24C2
- Malfunction indicator lamp on
- Particulate filter regeneration suppressed or aborted
- Often no noticeable change in driving behaviour
Common causes of P24C2
- Most likelyOne exhaust temperature probe has drifted with age and reads too high or too low
- PossibleCorroded or heat-damaged connector adding resistance to one probe signal
- PossibleEngine control software with too tight correlation limits (update available on some models)
- Less likelyProbes swapped between mounting positions after a repair
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Egt sensor b1s1Egt sensor b1s2Egt sensor b1s3Egt sensor b1s4
What each part of P24C2 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). |
| C2 | The exact fault in that area. |
What to do next
- Note P24C2 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 P24C2
What does P24C2 mean?
P24C2 means "Exhaust Gas Temperature Measurement System - Multiple Sensor Correlation Bank 1". Diesel exhaust lines often carry three or four temperature probes in a row, ahead of the oxidation catalyst, the particulate filter and the SCR catalyst. It is a generic code, so it means the same on every make.
Is it safe to drive with P24C2?
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 P24C2 fail an emissions test?
Yes, it can. P24C2 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 P24C2 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P24C2 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.