Restoring Ford Mustang PCM communication

Some 2020-2021 Ford Mustang GT500 vehicles built on or before June 30, 2021, may exhibit a no-crank/no-start with a no PCM communication condition if the oil level is about one or more quarts low and the oil life is at or less than 20%.

Mike Mavrigian

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Mitchell 1

July 22, 2025

This may be due to various parameters within the PCM. To correct the condition, reset and reprogram the PCM.

Restore communication to the PCM by removing the instrument panel cluster (IPC) fuse while reprogramming the PCM. This is done by removing the IPC fuse F13 in the body control module and installing a temporary two-prong fuse (with the same current rating as original) in the BCM F12 location.

After reprogramming, remove the temporary fuse and reinstall the three-prong fuse in F13. Change the engine oil and filter. Perform a reset of the engine oil change reminder.

About the Author

Mike Mavrigian

Motor Age Editor

Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.