P24C2: 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. 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.

Bank 1 is the side of the engine with cylinder 1. Inline engines only have this bank.

Symptoms

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

Most 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

What to check, in order

Start with the simplest. You can tick off each step.

1. Read the soot load and differential pressure with a scanner
2. Compare both signals at the same time in live data and check any recent installation work.
3. Check the differential pressure sensor's hoses
4. Check the temperatures before and after the filter
5. Fix any fuel injection or EGR codes before regenerating
6. Perform a regeneration while driving or at a repair shop when the diagnosis allows it

Good to know

• Repair difficulty: medium
• It affects emissions.

What each character of P24C2 means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• 4: Emissions
• C2: Specific fault in that system

Frequently asked questions

Can I keep driving with code P24C2?

If the light is on steadily, take a highway drive or go to a repair shop soon. If the car is in limp mode or the light is flashing, do not push the engine.

What causes code P24C2?

The most common causes are: 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).

Related codes

• P24C3Exhaust Gas Temperature Measurement System - Multiple Sensor Correlation Bank 2
• P2080Exhaust Gas Temperature Sensor Circuit Range/Performance (Bank 1 Sensor 1)
• P2084Exhaust Gas Temperature Sensor Circuit Range/Performance (Bank 1 Sensor 2)
• P242BExhaust Gas Temperature Sensor Circuit Range/Performance (Bank 1 Sensor 3)
• P246FExhaust Gas Temperature Sensor Circuit Range/Performance (Bank 1 Sensor 4)

Sources

• fordservicecontent.com: obd summary diesel 2023
• static.nhtsa.gov: MC 10139634 9999
• law.cornell.edu: 13 CCR 1968.2

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.