Diagnostic article Generic OBD-II
P24C2: Super Duty exhaust-temperature faults and the PCM software case
Ford’s diesel bulletin separates PCM programming from the additional recovery needed when the truck remains in forced idle.
Read before applying this article
Documented application
Ford TSB 21-2055, March 3, 2021: 2020–2021 F-Super Duty with 6.7L diesel, built on or before February 10, 2021, and qualifying PCM faults.
The code alone does not identify a failed part or establish that a vehicle is safe to drive. Confirm the vehicle, reporting module and applicable service procedure.
P24C2 is among the diagnostic entries in Ford TSB 21-2055 for certain 6.7L Super Duty trucks. The complaint is an illuminated malfunction lamp, and the vehicle may also be restricted to forced idle. Ford identifies several PCM software strategies as possible causes of the listed fault conditions within the stated production range.
Software applicability does not follow from the code alone
The bulletin requires the 2020–2021 model range, 6.7L diesel and build date on or before February 10, 2021. Preserve the full PCM scan and note whether the truck is actually in forced idle. A later-built truck or an unrelated exhaust-temperature complaint is not established as the same case merely because it has P24C2.
For a qualifying vehicle, Ford directs PCM reprogramming. The source does not prescribe replacing all exhaust-temperature sensors or treating every companion code as an independent hardware failure. It also does not provide a universal sensor-correlation threshold for diagnosing vehicles outside the bulletin.
Forced idle adds a separate recovery requirement
After programming, the procedure asks whether forced idle remains. If it does not, the described repair is complete. If it does, Ford requires an additional controlled recovery procedure with specified temperature and operating conditions. Programming and recovery are therefore separate milestones.
That recovery must be performed by trained service personnel; the source warns that full power returns immediately when the restriction clears. This article does not provide acceleration instructions for attempting it on the road. Ask the workshop to document software completion, recovery status and reassessment of the original faults rather than assuming that a cleared lamp proves normal operation.
Source and applicability
Ford TSB 21-2055, March 3, 2021: 2020–2021 F-Super Duty with 6.7L diesel, built on or before February 10, 2021, and qualifying PCM faults.
TSB 21-2055 — NHTSA manufacturer communication 10189774, physical PDF pages 1, 2.
Article source documents
Source checks describe how the text was prepared; they do not certify a diagnosis or confirm compatibility with every vehicle using this code.
Original code reference
Dictionary definition
Exhaust Gas Temperature Measurement System - Multiple Sensor Correlation Bank 1
This definition retains its original catalog scope. The article above is limited to its explicitly documented application.
Reference scope
Generic OBD-II definition.
A manufacturer label does not establish the model, year, engine or module to which a diagnosis applies. Read the safety and diagnostic limits.
Definition source
- DTC Database: pinned community code definitions
Source checked · MIT