25-2074
TECHNICAL SERVICE BULLETIN
06 March
Misfire With DTC(s) P0301, P0302, P0303, And/Or P0304 Stored In The PCM
2025
This bulletin supersedes 24-2384. Reason for update: vehicle models affected
Model:
Ford
2025 Bronco

Engine: 2.3L EcoBoost

2023-2025 Escape

Engine: 1.5L EcoBoost
Engine: 2.0L EcoBoost

2025 Explorer

Engine: 2.3L EcoBoost

2024-2025 Mustang

Engine: 2.3L EcoBoost

2025 Ranger

Engine: 2.3L EcoBoost

Lincoln
2023-2025 Corsair

Engine: 2.0L EcoBoost

2024-2025 Nautilus

Engine: 2.0L EcoBoost
Engine: 2.0L EcoBoost Hybrid

Markets: North American markets only
Issue: Some of the vehicles listed in the Model statement above may exhibit an engine misfire condition with DTCs
P0301, P0302, P0303 and/or P0304 set in the PCM.
Action: For vehicles that meet all of the criteria in the Issue and Model statements, follow the Service Procedure to
diagnose the vehicle.
Warranty Status: Information Only.
Repair/Claim Coding
Causal Part:

IN

Condition Code: -1

Service Procedure
NOTE: This article is for information only. Determine the causal part number and use available labor times in
the SLTS Manual or claim M-time in accordance with the Warranty and Policy Manual, do not use this article
number as the M-Time labor operation. Causal part number IN in this article refers to the information only
status and is not able to be claimed.
1. Remove and inspect the condition of all spark plugs. Refer to the WSM, Section 303-07. Are any spark plugs
damaged?
(1). Yes - proceed to Step 2.
(2). No - this article does not apply, replacement of the spark plugs is not necessary, proceed with normal
diagnostics found in the WSM.
2. Inspect the 12v battery positive and negative terminals for a loose condition, refer to WSM, Section 414-01 and
repair as necessary.
3. Inspect all PCM ground circuitry for loose connections and/or high resistance and repair as necessary.
4. Use a borescope to inspect the condition of the affected pistons and cylinder walls. Refer to Figures 1-3 for
examples of normal cylinder wall wear and Figures 4-5 for examples of damaged cylinder walls. Additional
examples of engine wear can be found in the Engine Failure Analysis GSB > Cylinder Wall and Piston Skirt
Inspection. Do the pistons and/or cylinder walls appear to be damaged?

Figure 1 - Showing normal cylinder wall wear

Figure 2 - Showing normal cylinder wall wear

Figure 3 - Showing normal cylinder wall wear

Figure 4 - Showing a damaged cylinder wall

Figure 5 - Showing a damaged cylinder wall

(1). Yes - remove the cylinder head to perform a more detailed inspection of the suspect damage. Refer to the
Engine Failure Analysis GSB > Cylinder Wall and Piston Skirt Inspection and repair as necessary. For cylinder
head removal, refer to the WSM, Section 303-01.
(2). No - perform a compression test and cylinder leakage test following WSM, Section 303-00 and repair as
necessary.
5. Replace all damaged spark plugs. Do not discard the damaged spark plugs so Ford can retrieve them following
the warranty parts return process.
6. Submit a GCR and include photos of damaged components, images from the borescope analysis and anything
else of interest that was found during the repair. These images will help improve engine quality for future model
vehicles.
(1). Do not use the Report A Problem link to submit the GCR.

© 2025 Ford Motor Company
All rights reserved.
NOTE: The information in Technical Service Bulletins is intended for use by trained, professional technicians with the knowledge, tools, and
equipment to do the job properly and safely. It informs these technicians of conditions that may occur on some vehicles, or provides information
that could assist in proper vehicle service. The procedures should not be performed by "do-it-yourselfers". Do not assume that a condition
described affects your car or truck. Contact a Ford or Lincoln dealership to determine whether the Bulletin applies to your vehicle. Warranty Policy
and Extended Service Plan documentation determine Warranty and/or Extended Service Plan coverage unless stated otherwise in the TSB article.
The information in this Technical Service Bulletin (TSB) was current at the time of printing. Ford Motor Company reserves the right to supersede
this information with updates. The most recent information is available through Ford Motor Company's on-line technical resources.