# P0128 on the 2007 Chrysler PT Cruiser

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 P0128

- [10215810](https://open.wenmarpro.com/bulletins/10215810), 2022-07-18: This bulletin involves reprogramming the Powertrain Control Module with new software. The Technician may discover that P0128 \- Thermostat Rationality DTC is present. This DTC is a two trip code and is matured if a significant difference exists between the PCM predicted and actual engine coolant temperature during engine warm\-ups. The PCM calibration may improperly mature a P0128 DTC because the airflow across the coolant temperature sensor during colder ambient temperatures, 50° F \(10° C\) or below, causes the predicted coolant temperature to deviate from the actual coolant temperature.
- [10188643](https://open.wenmarpro.com/bulletins/10188643), 2021-03-15: This bulletin involves reprogramming the Powertrain Control Module with new software. The Technician may discover that P0128 \- Thermostat Rationality DTC is present. This DTC is a two trip code and is matured if a significant difference exists between the PCM predicted and actual engine coolant temperature during engine warm\-ups. The PCM calibration may improperly mature a P0128 DTC because the airflow across the coolant temperature sensor during colder ambient temperatures, 50° F \(10° C\) or below, causes the predicted coolant temperature to deviate from the actual coolant temperature.