P24F3 code meaning
Reductant Tank Temperature/Fuel Temperature Correlation
Powertrain system Generic code P24xx codes Check engine light
What P24F3 means
P24F3 sets the temperature reported from the DEF (reductant) tank against the fuel temperature. After a long soak both liquids rest close to ambient, so a clear mismatch exposes a sensor that reads wrong although each signal may be electrically valid. No manufacturer explains P24F3 in a public service document. Ford's 2023 diesel summary shows the same principle with other partners: P205B flags more than 40 °C between tank and DEF quality sensor temperature at start-up, and P0181 holds fuel temperature against the charge-air reading after six hours off. CARB requires such rationality checks for input sensors that feed emission controls. Where the DEF sensor is built into the tank module, the fix can mean a costly tank unit; driving is normally unaffected.
P24F3 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 P24F3
- Warning lamp, often after a cold start
- DEF tank and fuel temperature far apart in live data after an overnight stop
Common causes of P24F3
- Most likelyDEF tank temperature sensor (often integrated in the tank or sender module) reading wrong
- PossibleFuel temperature sensor drifting
- Less likelyLocal heat source such as an exhaust leak warming one sensor
- Less likelyContact resistance in a sensor connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Reductant tank temperature sensorFuel temperature sensor
What each part of P24F3 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). |
| F3 | The exact fault in that area. |
What to do next
- Note P24F3 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 P24F3
What does P24F3 mean?
P24F3 means "Reductant Tank Temperature/Fuel Temperature Correlation". P24F3 sets the temperature reported from the DEF (reductant) tank against the fuel temperature. It is a generic code, so it means the same on every make.
Is it safe to drive with P24F3?
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 P24F3 fail an emissions test?
Yes, it can. P24F3 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 P24F3 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P24F3 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.