P0128 Fault Code

P0128 Engine Cooling System: Stuck Open or Leaking Thermostat Monitor

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 P0128 DTC To Be Set

Ambient air temperature dependent (ambient air temperature multiplied with a warm up delay time toget total warm up time)

MIL Illumination

2 Drive Cycles

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Don't forget ! When a fault code pops up, Volvo's Uptime Center is automatically notified via an cellular link, and it alerts the truck's owner by prearranged methods, usually email or phone calls.