Diagnostic Aids
WARNING: This page is about a different car, the 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
The most likely cause of this DTC is an improperly operating engine coolant system and thermostat. Diagnose thermostat to verify proper cooling system and thermostat operation.
A fault not present indicates the condition that caused the DTC to set is intermittent and not currently present. Refer to INTERMITTENT CONDITIONS under SELF-DIAGNOSTIC SYSTEM. If any additional DTCs were stored, proceed to the applicable DTC. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .