Technical Definition:
Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
Trouble Code: P0128
Address: 0x0128
System: Powertrain
Subsystem: Fuel and Air Metering
Address: 0x0128
System: Powertrain
Subsystem: Fuel and Air Metering
Technical Description:
Possible Causes:
Possible Symptoms:
Coolant Thermostat Malfunction
Possible Solutions:
OBD-II Trouble Code Type:
Diagnostic Step:
Tech Notes:
– Leaking or stuck open thermostat
– Low engine coolant level
– Insufficient warm up time
– Faulty engine coolant temperature sensor
– Engine coolant temperature sensor harness is open or shorted
– Engine coolant temperature sensor circuit poor electrical connection