Thread: 04 GTP newbie with a few questions

Originally Posted by 231FUN

Yup, just dealt with this on the 06 the other day. Bad t-stat stays open and prevents the coolant from getting up to operating temp, usually find this problem when winter hits on a highway drive when car is geting alot of cold air.

Thats exactly when it came on! i was on the highway going about 65 or so and it was really cold outside

Originally Posted by Explicit_Spade

When the coolant is too low to effectively protect the internal temperature of the engine, the engine coolant temperature (ECT) sensor will provide a false reading to the powertrain control module (PCM). Once the PCM detects the anomaly in the coolant system, the ECT fails to communicate the necessary voltage signal from the PCM, which turns on the "check engine" light.

If the ECT is bad, you will need to replace it for the check engine light to clear. You can have the code manually cleared, and see if it comes back.

The thermostat is a very common problem in these cars but as this guy said prolly should make sure it's not low coolant and if so if there's a leak if not it would be wise to change thermostat very easy and flush old coolant out


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