# P166B on the 2021 Ford GT

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 P166B

- [10209220](https://open.wenmarpro.com/bulletins/10209220), 2022-03-22: Some 2017\-2022 Ford GT vehicles may exhibit diagnostic trouble code \(DTC\) P166B present in the gear shift module \(GSM\) after an on\-demand self test is performed. This is likely due to the driver door not being fully closed and locked during the on\-demand self\-test. A false P166B DTC can set if the driver door is not fully closed or if it is unlocked during the self\-test. If P166B is still present with the driver door fully closed and locked during the on\-demand self\-test, continue with normal diagnostics in Workshop Manual \(WSM\), Section 307\-05.
- [10198644](https://open.wenmarpro.com/bulletins/10198644), 2021-07-02: Some 2017\-2021 Ford GT vehicles may exhibit diagnostic trouble code \(DTC\) P166B present in the gear shift module \(GSM\) after an on\-demand self test is performed. This is likely due to the driver door not being fully closed and locked during the on\-demand self\-test. A false P166B DTC can set if the driver door is not fully closed or if it is unlocked during the self\-test. If P166B is still present with the driver door fully closed and locked during the on\-demand self\-test, continue with normal diagnostics in Workshop Manual \(WSM\), Section 307\-05.