2020-2021 Ford Mustang Shelby GT500 - Hood Inner Panel Cracks

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NHTSA ID Number: 10194436

Manufacturer Communication Number: TSB 21-2155

Summary

Some 2020-2021 Mustang Shelby GT500 vehicles may exhibit a cracking on the hood inner panel. The crack is a cosmetic condition, not a structural concern. This may be due to a variation in production of the hood. To correct the condition, follow the Service Procedure to repair the hood crack.

Model:

Ford

2020-2021 Mustang Shelby GT500

Issue: Some 2020-2021 Mustang Shelby GT500 vehicles may exhibit a cracking on the hood inner panel. The crack is a cosmetic condition, not a structural concern. This may be due to a variation in production of the hood. To correct the condition, follow the Service Procedure to repair the hood crack.

Action: Follow the Service Procedure steps to correct the condition on vehicles that meet all of the following criteria:

2020-2021 Mustang Shelby GT500
Cracked inner hood panel

NOTE:

Parts

Service Part Number	Quantity	Description
Obtain Locally	As Needed	Body Filler
Obtain Locally	As Needed	3M™ Ultra Fine Finishing Pad Or Equivalent
Obtain Locally	As Needed	400-600 Grit Sandpaper

Service Procedure

Figure 1

Figure 2

Figure 3

1. Lightly sand the affected area using 400-600 grit sandpaper.

2. Prepare the cracked surface by spraying an alcohol/water mixture on a microfiber cloth and using it to clean the surface.

3. Create typical body filler by mixing resin and hardener following manufacturer specifications. Mix enough to last 2 minutes.

4. Using a plastic blade, apply thin layers to fill the void. Use a front, back, and side to side motion. Make sure the material is bordered on all sides.

5. Allow the body filler to dry for a minimum of 15 minutes or as specified by manufacturer.

6. Use 3M™ Ultra Fine Finishing Pad or equivalent to sand. This will level the body filler down with the SMC substrate. The 3M™ Ultra Fine Finishing Pad or equivalent will finesse over the sanding marks from Step 1.

7. Spot paint the under hood affected area that was repaired. Mix and apply base coat and clear coat following the Ford approved paint system technical information.

2 Affected Products

Vehicle