Powertrain, generic (extended)

P24F2 EGR Temperature/Charge Air Cooler Temperature Correlation

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P24F2 compares two readings in the intake path of a diesel with cooled exhaust gas recirculation: the gas temperature after the EGR cooler and the air temperature behind the charge air cooler. When conditions say both should be close, for instance after the engine has cooled down, a wide gap shows that one of the two sensors cannot be trusted. Chrysler lists the code for the 3.0 L EcoDiesel (sales code EXF) in the 2014 Ram 1500 and Jeep Grand Cherokee; bulletins 18-028-14 and 18-018-14 cure false settings with new PCM software rather than parts. Chrysler publishes no thresholds. Circuit faults of the single sensors have their own codes such as P040C or P0097. The driver usually sees only the warning lamp; EGR use may be limited.

Likely causes

Outdated PCM calibration flagging the correlation without a real fault (Chrysler 3.0 L diesel)
EGR temperature sensor drifting or sooted up
Charge air cooler outlet temperature sensor reading wrong
Corroded connector adding resistance to one sensor signal

Symptoms

  • Check engine light, often without any noticeable driving fault
  • EGR operation reduced as a precaution on some calibrations
  • Implausible EGR or charge air temperatures in live data after a cold soak

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–450
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

egr temperature sensorcac outlet temperature sensor

Related codes

P040BP040CP0097P0098P24C2

References: static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.