p0128
Moderate
Kia · SUVs
Coolant Thermostat (Coolant Temp Regulation) Malfunction
Quick Answer
Error code P0128 on your Kia SUVs means: Coolant Thermostat (Coolant Temp Regulation) Malfunction. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
KX9EV9 GT-Line 2024EV9 Light 2024EV9 Wind 2024Seltos EX 2024Seltos LX 2024Seltos S 2024Seltos SX 2024Sorento EX 2024Sorento LX 2024Sorento S 2024Sorento SX 2024Sorento SX Prestige 2024Sorento X-Line 2024Sportage EX 2024Sportage LX 2024Sportage SX Prestige 2024Sportage X-Line 2024Sportage X-Pro 2024Telluride EX 2024Telluride LX 2024Telluride S 2024Telluride SX 2024Telluride SX Prestige 2024Telluride X-Line 2024Telluride X-Pro 2024AP3AP3-EKX2MQ4MQ4-HPSKMKM-HKX
Likely Causes
How to Fix It
1
Monitor coolant temperature on scanner
2
Check radiator coolant level
3
Test thermostat operation
4
Inspect water pump function
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Thermostat
Coolant
Water pump gasket
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