P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
P0128 - COOLANT THERMOSTAT (COOLANT TEMPERATURE BELOW THERMOSTAT REGULATING TEMPERATURE)
| Description: | Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine. | |||
| Possible Causes: |
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| Diagnostic Aids: | Refer toTHERMOSTAT MONITOR for system information. | |||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory | |
| Vehicles with only a CHT sensor | - | - | refer to PINPOINT TEST DL . | |
| All others | - | - | refer to PINPOINT TEST DX . | |