# Service bulletin SSM 53638

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.

- Type: Service bulletin
- NHTSA id: 11017064
- Published by NHTSA: 2025\-04\-16
- Manufacturer's number: SSM 53638
- Manufacturer's date: 2025\-04\-14
- NHTSA component: UNKNOWN OR OTHER

## NHTSA's summary

After replacement of any TRON module, the gateway module \(GWM\) and the TRON capable modules can set diagnostic trouble codes \(DTCs\) U211A, U211B, U211C, U3034, U3035, U3036, U35D9, U35DA and/or U35DB if the secret authentication security keys are not aligned between the modules, a loss of communication is occuring between modules and/or a module is not responding. This may be a result of missing the new module secret authentication security key obtained when running the Ford Diagnosis and Repair System \(FDRS\) "Trusted Real\-Time Operation Network \(TRON\) Module Authentication" procedure after replacement. When replacing a TRON capable module, run the FDRS "Trusted Real\-Time Operation Network \(TRON\) Module Authentication" procedure to distribute a new set of secret authentication security keys to all TRON\-capable modules. Using the specific VIN, refer to Workshop Manual \(WSM\), Section 418\-00 and 418\-01 for updated DTCs, applicable TRON module listings and pinpoint tests.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11017064-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11017064-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Trouble codes named

U211A, U211B, U211C, U3034, U3035, U3036, U35D9, U35DA, U35DB

## Vehicles listed

- 2025 FORD BRONCO SPORT
- 2024 to 2025 FORD ESCAPE
- 2025 FORD EXPEDITION
- 2024 to 2025 FORD EXPLORER
- 2024 to 2025 FORD F\-150
- 2023 to 2025 FORD F\-250 SD
- 2023 to 2025 FORD F\-350 SD
- 2023 to 2025 FORD F\-450 SD
- 2023 to 2024 FORD F\-550 SD
- 2025 FORD MAVERICK
- 2024 to 2025 FORD MUSTANG
- 2025 FORD MUSTANG MACH E
- 2024 to 2025 LINCOLN AVIATOR
- 2024 to 2025 LINCOLN NAUTILUS
- 2025 LINCOLN NAVIGATOR

JSON: [/v1/bulletins/11017064](/v1/bulletins/11017064)

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