Chrysler Code P0128 is an error code used to diagnose a potential issue with the vehicle’s thermostat. This code is generated when the powertrain control module (PCM) notices that the engine coolant temperature isn’t reaching the highest temperature required to enable other diagnostics, or the coolant temperature does not reach a warmed up temperature within 11.0°C (20°F) of the thermostat regulating temperature. There are various possible causes for this code to be generated, ranging from low coolant level to cooling system issues to thermostat operation. This article will provide an overview of the causes and solutions associated with the Chrysler Code P0128.
Causes and Solutions of Chrysler Code P0128
| Causes | Solutions |
|---|---|
| Low Coolant Level | Check and refill the coolant level |
| Cooling System Issues | Check the hoses and radiator for leaks |
| Thermostat Operation | Replace or adjust the thermostat |
| PCM Needs Resetting | Reset the PCM to factory settings |
Low Coolant Level
The first potential cause of the Chrysler Code P0128 is a low coolant level. This can be caused by a leak or simply by normal evaporation of the coolant over time. If the coolant level is low, it can cause the engine to overheat, which can lead to the code being triggered. To fix this issue, the coolant level should be checked and refilled as necessary.
Cooling System Issues
The second potential cause of the Chrysler Code P0128 is a cooling system issue. This could be caused by a leak in one of the hoses or the radiator, or it could be caused by clogs in the cooling system. To fix this issue, the hoses and radiator should be checked for any signs of leaks or clogs.
Thermostat Operation
The third potential cause of the Chrysler Code P0128 is a problem with the thermostat. If the thermostat is stuck open or closed, it can prevent the engine from reaching the proper temperature. To fix this issue, the thermostat should be adjusted or replaced.
PCM Needs Resetting
The fourth potential cause of the Chrysler Code P0128 is that the powertrain control module (PCM) needs to be reset. If the PCM has been tampered with or if it has been disconnected from the battery, it may need to be reset to factory settings in order to properly diagnose the issue. To fix this issue, the PCM should be reset to factory settings.
Conclusion
The Chrysler Code P0128 is an error code used to diagnose a potential issue with the vehicle’s thermostat. There are various possible causes for this code to be generated, ranging from low coolant level to cooling system issues to thermostat operation. By diagnosing and addressing the underlying issue, it is possible to fix the Chrysler Code P0128 and get your vehicle running smoothly again. To ensure the best results, it is important to properly diagnose the issue and then take the appropriate action to fix the Chrysler Code P0128.
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