# U211C on the 2024 Lincoln Nautilus

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

This code is specific to a manufacturer and is not described here.

## Bulletins for this model year that name U211C

- [11018238](https://open.wenmarpro.com/bulletins/11018238), 2025-05-13: 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 occurring 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 in the GWM tool box, not in the toolbox of the module with the DTC's, to distribute a new set of secret authentication security keys to all TRON\-capable modules. Using the specific vehicle identification number \(VIN\), refer to Workshop Manual \(WSM\), Section 418\-00 and 418\-01 for updated DTCs, applicable TRON module listings and pinpoint tests.
- [11017064](https://open.wenmarpro.com/bulletins/11017064), 2025-04-16: 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.
- [10247153](https://open.wenmarpro.com/bulletins/10247153), 2023-12-11: Some 2024 Nautilus vehicles may set diagnostic trouble code \(DTC\) U211C:04 in the gateway module A \(GWM\) when a diagnostic self\-test is performed. This may be due to a module communication error within a specified timeframe. DTC U211C:04 has no effect on functionality and will automatically become a historical DTC which can be cleared. Replacement or reprogramming of the GWM will not resolve this condition. Engineering is currently working on a software update which is expected in Q1 2024. Continue to monitor OASIS for additional information.