Question about 2001 Pontiac Grand Prix

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Engine coolant temperature is lower than thermostat

My Service Engine Soon light came on, I went to AutoZone and had their reader hooked up to my car and it said my engine coolant temperature is lower than the thermostat. What does that mean? It also said that my Bank 1 Sensor 2 oxygen sensor was bad. I replaced it. Are these 2 problems related? My car seems to be running fine now that i've changed the sensor, but the service engine soon light is still on.

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  • jwellz Jan 16, 2009

    have the same problem also don t know where the thermastat is

  • Anonymous Mar 12, 2014

    coolant leaked on engine, sputter, service engine soon light

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This happens when the Engine Coolant Temperature (ECT) does not reach 75°C (167°F) despite sufficient engine warm-up time.

This happens usually when the thermostat/temperature sensor is faulty, and is bad for emissions and fuel consumption.

The repair cost may vary, even if themperature sensor is not an expensive part, after replacing the sensor there is need to reset the ECU (car computer module).

Posted on Dec 13, 2008

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  • 12 Answers

You need a temp sensor

Posted on Nov 27, 2008

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Could be the thermostat. I know nothing about cars but I noticed my 2000 Grand Prix temp gauge was not going to the normal level. My wife drives this car so I didn't notice it for a month or so. Eventually the Engine light came on. Took it to Autozone and the code came back as P0180... (1) low coolant (2) bad thermostat (3) enginge fuel temp sensor. They used a code reader that was about the size of an Ipod nano.

Coolant was okay, so took it to my mechanic. His netbook sized computer showed it was the Thermostat. He reset the codes and the temp guage went back to normal. Was short on $40 for the fix at the time, so I parked the car and promised to bring it back in 3 days. Went out and checked the car a day later at 25 degrees outside without starting the car... gauge still sitting at the normal level. No question it's the thermostat. That car will not be driven again until T.stat is fixed in 2 days.

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Get the shop manual and test the coolant temperature sensor,relay and ECU. These are simple checks usually a visual inspectionor a little probing with a Digital Voltmeter will solve the problem.

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