Volvo All Engines (2010 Emissions) Fault Code: SPN 1659 FMI 12 PID: PSID 109 Engine Coolant System thermostat

Conditions for diagnostic trouble code (DTC):
1) The component is stuck in opened position

Observable symptoms
1) Engine does not reach normal operating temperature

Probable cause
1) The thermostat may have seized in open position if the engine has been warmed up too slowly

Detailed information
1) By comparing calculated and measured coolant temperature on a hot engine, one can determine if engine warm-up occurred sufficiently fast

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