Service Message 2023–2024 Bronco Sport "Engine Coolant Over-Temperature" Message and an Illuminated MIL — 55283

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Special Service Message · SSM 55283

This is a Special Service Message, not a recall. SSMs are informational notes Ford sends dealers about a known condition or a change in procedure. They are not repair orders, and they don't by themselves change what is covered.

Published: Oct 27, 2026
Applies to: Bronco Sport (2023–2024 model years)

Restrictions stated in the source:

• Engine: 1.5L
• Equipment: equipped with a 1

Summary (official text)​

Some 2023-2024 Bronco Sport vehicles equipped with a 1.5L EcoBoost engine may exhibit an "Engine Coolant Over-Temperature" message and an illuminated MIL with DTCs P1285 and/or P1299 stored in the PCM during hard acceleration or under high load conditions. If the concern can be replicated under these conditions, refer to Workshop Manual (WSM), Section 303-03A > Diagnosis and Testing > Engine Temperature > Pinpoint Test DL "Cylinder Head Temperature (CHT) Sensor" and repair as directed. Do not attempt to modify the orientation of the CHT sensor. If diagnostics lead to CHT replacement, inspect connector C1164 for terminal issues and replace the pigtail if necessary. If the concern persists, thoroughly perform the Engine Cooling System Flushing procedure in WSM, Section 303-03A > General Procedures. Do not use the VC1 flush additive.<br/><br/> When performing the fill and bleed procedure, it is important that the vacuum filling and bleeding aspect of the procedure is performed thoroughly. Not fully bleeding the cooling system can lead to air trapped in the cylinder head.<br/><br/> If the concern persists

Sources​

• SSM 55283 (PDF, NHTSA document 11038696) — Oct 27, 2026

Details from NHTSA as of Oct 27, 2026. If NHTSA or Ford revises this notice, this post is updated and significant changes are noted in a reply. The linked documents are the authority, and a dealer can confirm whether it applies to your VIN.

Have you experienced this issue with your vehicle? Let us know your model year and engine, plus any diagnosis or repair details.