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Volvo engine code DTC P0128
Engine Cooling System: Time To Reach Threshold Temperature This OBD monitor evaluates the coolant thermostat. If the coolant temperature sensor value doesn’t reach the threshold or if the temperature decreases below the threshold during operation the thermostat is judged as faulty and a DTC is set. P0128 Engine Cooling System: Stuck Open or Leaking Thermostat Monitor DTC P0128 Component / System Engine Cooling System - Thermostat failure Monitor Strategy Description Stuck open or leaking thermostat Fault Limit Coolant temperature threshold < 72°C Enable Conditions • Engine Speed 1000 - 1600 RPM • Engine Torque 550 - 1200 Nm • Vehicle Speed > 40 km/h • Ambient Air Temperature -15 - 55 °C • Barometric Pressure 75 - 105 kPa • Coolant Temperature at Start < 72 °C Disable Conditions No Active DTC's: • P0112, P0110, P0117, P0115, P0116, P0339, P0335, P0336, P2226, P2227, P2229 Time Required For DTC To Be Set Ambient air temperature dependent (ambient air temperature multiplied with a warm up delay time to get total warm up time) MIL Illumination 2 Drive Cycles