COOLING SYSTEM CONCERNS - OVERHEATING (SKYACTIV-G, US) DESCRIPTION AND POSSIBLE CAUSE

Troubleshooting item	Cooling system concerns-overheating
Description	The engine coolant temperature is abnormally high.
Possible cause	Engine heat generation amount is excessive Engine speed is high and remains high for continuous long periods PCM DTC is stored Improper operation of A/C system Insufficient air blow volume Cooling fan inoperative Active air shutter is fully-closed and does not operate (With active air shutter) Fan rotation speed decreases (such as generator malfunction) due to battery voltage decrease ECT sensor No. 1 malfunction (value lower than actual engine coolant temperature detected) ECT sensor No. 2 malfunction (value lower than actual engine coolant temperature detected) Cooling system cap malfunction Cooling fan motor assembly malfunction Cooling fan motor connector malfunction Active air shutter malfunction (With active air shutter) Improper indication of high engine coolant temperature warning indication ECT sensor No. 1 signal malfunction ECT sensor No. 2 signal malfunction Center display malfunction Body control module (BCM) malfunction Multi-information display malfunction Blown fuse Engine coolant system malfunction Improper engine coolant level Water pump malfunction Engine coolant performance deterioration Coolant leakage (engine internal, external) Improper water/anti-freeze mixture Improper operation of coolant control valve Radiator malfunction (clogging) Inappropriate engine coolant concentration (engine coolant in radiator freezes and engine coolant does not flow) Foreign matter penetration in engine coolant Leakage around heater unit in passenger compartment Drive belt damage
System wiring diagram	Not applicable
Connector diagram	Not applicable

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Cooling System Concerns-Overheating (Us): Notes

Use the Manual With the Right Hardware

When to See a Mechanic

Rather have a pro handle this?