Powertrain, generic (extended)

P24C2 Exhaust Gas Temperature Measurement System - Multiple Sensor Correlation Bank 1

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

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.

Likely causes

One exhaust temperature probe has drifted with age and reads too high or too low

Corroded or heat-damaged connector adding resistance to one probe signal

Engine control software with too tight correlation limits (update available on some models)

Probes swapped between mounting positions after a repair

Symptoms

Malfunction indicator lamp on
Particulate filter regeneration suppressed or aborted
Often no noticeable change in driving behaviour

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€80–700

Time0.5–3 h

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

Parts involved

egt sensor b1s1egt sensor b1s2egt sensor b1s3egt sensor b1s4

Related codes

P24C3 P2080 P2084 P242B P246F

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