P1798: Coolant Temperature Circuit Malfunction
HighPowertrainCooling System
What does P1798 mean?
P1798 is a diagnostic trouble code indicating "Coolant Temperature Circuit Malfunction". A component in the cooling system has been flagged as malfunctioning by the vehicle's ECU. This requires diagnosis to determine whether the part itself has failed or if there is a related wiring or control issue.
Common causes
- Stuck thermostat (open or closed)
- Low coolant level or coolant leak
- Failed coolant temperature sensor
- Faulty water pump
- Blocked radiator
What should you do?
This is a significant issue that should be diagnosed and repaired soon. Avoid long trips or heavy driving until the problem is resolved. Continued driving may cause additional damage.
Get a diagnosis for YOUR car
Code P1798 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.