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01/11/2021 1:35 pm
Topic starter
The engine light just came on my 2015 Jeep JK with 99,000 miles. My Actron scanner shows 2 of the same code P0128; Coolant Temp Below Thermostat Regulating Temp.
What is this and how can I fix it? I can’t find anything online. Thanks!
1 Answer
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01/11/2021 1:51 pm
P0128 means that the engine is running cooler than its normal operating temperature.
Check the coolant level. I would then check the thermostat- it may be stuck in a open position. I would also check the cooling fan-it may be on permanently. Also, check the engine coolant temperature sensor to see if that has gone bad.
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