# U0100 on the 2021 Toyota Avalon

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.

Nobody has written a description of this code yet.

## Bulletins for this model year that name U0100

- [11005084](https://open.wenmarpro.com/bulletins/11005084), 2024-07-23: After jump\-starting, the vehicle may experience a no\-start condition and multiple DTCs including U010087. Upon investigation, it is found that the engine ECU has been damaged and needs to be replaced. In several cases, it was found that the cause of the ECU damage was improper jump starting. Further investigation found that ECU damage may occur if the negative \(ground\) cable clamps are attached on or around the engine ECU or ECU mounting bracket.
- [11005026](https://open.wenmarpro.com/bulletins/11005026), 2024-07-23: After jump\-starting, the vehicle may experience a no\-start condition and multiple DTCs including U010087. Upon investigation, it is found that the engine ECU has been damaged and needs to be replaced. In several cases, it was found that the cause of the ECU damage was improper jump starting. Further investigation found that ECU damage may occur if the negative \(ground\) cable clamps are attached on or around the engine ECU or ECU mounting bracket.
- [10238144](https://open.wenmarpro.com/bulletins/10238144), 2023-06-26: TT: After jump\-starting, the vehicle may experience a no\-start condition and multiple DTCs including U010087. Upon investigation, it is found that the engine ECU has been damaged and needs to be replaced. In several cases, it was found that the cause of the ECU damage was improper jump starting. Further investigation found that ECU damage may occur if the jumper cables are hooked up on or around the engine ECU or ECU mounting bracket
- [10220219](https://open.wenmarpro.com/bulletins/10220219), 2022-09-15: TT: After jump\-starting, the vehicle may experience a no\-start condition and multiple DTCs including U010087. Upon investigation, it is found that the engine ECU has been damaged and needs to be replaced \(Fig 1\). In several cases, it was found that the cause of the ECU damage was improper jump starting. Further investigation found that ECU damage may occur if the jumper cables are hooked up on or around the engine ECU or ECU mounting bracket
- [10211794](https://open.wenmarpro.com/bulletins/10211794), 2022-05-16: TT: After jump\-starting, the vehicle may experience a no\-start condition and multiple DTCs including U010087. Upon investigation, it is found that the engine ECU has been damaged and needs to be replaced \(Fig 1\). In several cases, it was found that the cause of the ECU damage was improper jump starting. Further investigation found that ECU damage may occur if the jumper cables are hooked up on or around the engine ECU or ECU mounting bracket