Service bulletin TSB 21-2011

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
Type	Service bulletin
NHTSA id	10189765
Published by NHTSA	2021-04-03
Manufacturer's number	TSB 21-2011
Manufacturer's date	2021-03-26
NHTSA component	EQUIPMENT; ENGINE AND ENGINE COOLING

NHTSA's summary

Some 2020 Mustang GT500 vehicles built on or before 28-Aug-2020 may exhibit various concerns with the active exhaust system. These may include "Drive Mode Not Available" or "Exhaust Mode Not Available" messages, and/or diagnostic trouble codes (DTCs) P26C5, P26C6, P26FE, P2BF9, P2BFB, P26C7, P2BF5, P2BF8, P2BFD, and/or P2BFA. This may be due to pinched wiring or a misaligned bracket where the exhaust actuator mounts. To correct the condition, follow the Service Procedure to make sure that the exhaust is seated correctly.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Engine, Equipment and accessories

Trouble codes named

P26C5, P26C6, P26C7, P26FE, P2BF5, P2BF8, P2BF9, P2BFA, P2BFB, P2BFD

Vehicles listed
FORD GT	2020

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
SAN-Vol1 I1	2023-08-16. Service bulletin. The Service Awareness Newsletter is an informal communication that contains information that may not be presently available in a TSB, SSM, GSB, or other electronic communication. This article includes information on warranty, technical service tips and other service information.
SSM 50693	2022-04-20. Service bulletin. Some 2017-2021 Ford GT vehicles built on or before 22-Sep-2021 may need to have a new battery installed for service. A new design service battery has been released and requires a different battery tray and a different local interconnect network (LIN) connector. This is due to the new battery being smaller and will not properly secure in the original battery tray. The LIN connector socket in the new battery is keyed differently and the original LIN connector will not plug in. The LIN connector will need to be de-pinned, so the new connector shell can be installed. When installing new battery part number: MG7Z-10655-A(USA/MEX), MG7Z-10655-B(CAN), MG7Z-10655-C(GCC) MG7Z-10655-D(EU), the following battery tray and LIN connector must be used: battery tray MG7Z-10732-A, LIN connector shell MG7Z-9A624-A. Refer to Workshop Manual, Section 414-01 for battery tray replacement.
SSM 50616	2022-03-22. Service bulletin. Some 2017-2022 Ford GT vehicles may exhibit a runs rough or hard start with or without an illuminated MIL with DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306 and/or P0316. Prior to performing any diagnostics, determine if the vehicle operating conditions may have resulted in multiple cold engine start-ups without allowing the engine to reach normal operating temperature and being driven. If that operating condition is determined, inspect the spark plugs per Workshop Manual (WSM), Section 303-00 and repair as directed. If no concern with spark plugs are found, proceed with normal diagnostics per the Powertrain Controls/Emission Diagnosis (PC/ED) Manual. Upon returning the vehicle, refer the customer to the owners guide regarding proper driving cycles.
21B26	2021-05-04. Service bulletin. Certain 2020 Model Year Mustang GT500/GT350 Equipped with a 5.2L Engine Secondary Timing Chain Tensioner In some of the affected vehicles, the engines secondary timing chain tensioner may not have been properly activated during assembly, which could result in a timing loss. Timing loss could lead to internal engine damage, a rough running engine, and engine misfires.
TSB 20-2352	2020-11-05. Service bulletin. Some 2017-2020 Ford GT vehicles built on or before 10-Sep-2020 may exhibit a rattle/buzzing noise from the left rear of the vehicle during hot idle. This may be due to the transmission control module (TCM) calibration. To correct the condition, follow the Service Procedure steps to reprogram the TCM.