'05 Sunfire Erratic Temp Gauge

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Thread: '05 Sunfire Erratic Temp Gauge

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    '05 Sunfire Erratic Temp Gauge

    I have an '05 Sunfire in which the temp gauge has gone erratic. When the prob 1st started, with the car cold, the needle would read something ridiculous like 200 degrees, then just climb from there once the car was running. The temps seem normal. Now the gauge is pinned all the way to the right, all the time. Anyone know how to fix this?

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    Re: '05 Sunfire Erratic Temp Gauge

    200 degrees is normal. I'd go look under the hood and find your radiator hoses. Their will be 2 of them. When the car is up to normal operating temp both hoses should be really hot to the touch. If one is hot and the other isn't then you've likely got a bad thermostat or water pump. If they both feel the same and you've got good, lasting heat out of the dash vents then it's the gauge.
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    Re: '05 Sunfire Erratic Temp Gauge

    Quote Originally Posted by Johnny P View Post
    200 degrees is normal. I'd go look under the hood and find your radiator hoses. Their will be 2 of them. When the car is up to normal operating temp both hoses should be really hot to the touch. If one is hot and the other isn't then you've likely got a bad thermostat or water pump. If they both feel the same and you've got good, lasting heat out of the dash vents then it's the gauge.
    200 degrees is not normal when it's 20 degrees outside & the car's been sitting for 18 hrs. There's a prob w/the gauge...the car's temp seems fine. The gauge needle is pinned ALL THE WAY the the right (beyond temp readings).

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    Re: '05 Sunfire Erratic Temp Gauge

    Probably the wire to the sensor has broken, resistance -> infinite and thus infinite temperature...

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    Re: '05 Sunfire Erratic Temp Gauge

    Quote Originally Posted by WaWaZat View Post
    200 degrees is not normal when it's 20 degrees outside & the car's been sitting for 18 hrs. There's a prob w/the gauge...the car's temp seems fine. The gauge needle is pinned ALL THE WAY the the right (beyond temp readings).

    So you're saying that it reads that immediately? If so, you've got a bad gauge, wire or sender. Not likely the wire though.
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    Re: '05 Sunfire Erratic Temp Gauge

    on an 05 sunfire the gauge is controlled by the pcm over the class 2 data line,the pcm recieves signals from the ect sensor and sends them to the ipc.if the ect sensor was reading 200 degrees when its that cold engine wouldnt even try to start and also cel would be on.most likely the problem is in ipc itself.

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    Re: '05 Sunfire Erratic Temp Gauge

    Quote Originally Posted by scooter10572 View Post
    on an 05 sunfire the gauge is controlled by the pcm over the class 2 data line,the pcm recieves signals from the ect sensor and sends them to the ipc.if the ect sensor was reading 200 degrees when its that cold engine wouldnt even try to start and also cel would be on.most likely the problem is in ipc itself.
    What/where is the ipc?

    I was told by a gauge repair shop, that I found w/Google, that this happens in these cars all the time. They said the motors go bad & that it won't be long before the rest of the gauges go silly. They say for $235, they will put upgraded motors in all the gauges if I send the cluster. Any input???

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    Re: '05 Sunfire Erratic Temp Gauge

    $235 is silly money you should be able to buy a new set of gauges at the junkyard or on ebay for like $20. And then you have two!

    IPC is that assembly with the gauges, panel behind them, etc.

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    Re: '05 Sunfire Erratic Temp Gauge

    Quote Originally Posted by Smaart Aas Saabr View Post
    $235 is silly money you should be able to buy a new set of gauges at the junkyard or on ebay for like $20. And then you have two!

    IPC is that assembly with the gauges, panel behind them, etc.
    Oh so Instrument Panel Cluster???

    If this is an incessant prob, buying a used one would still leave the likeliness of it happening again. Anyone know how rampant this issue really is?

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    Re: '05 Sunfire Erratic Temp Gauge

    Quote Originally Posted by WaWaZat View Post
    I have an '05 Sunfire in which the temp gauge has gone erratic. When the prob 1st started, with the car cold, the needle would read something ridiculous like 200 degrees, then just climb from there once the car was running. The temps seem normal. Now the gauge is pinned all the way to the right, all the time. Anyone know how to fix this?
    This same thing just happened to me the other day. I thought my car was overheating so after I shut it off and turned it back on later, the gauge was all messed up and pinned to the right as well...it also messed my tach up too. It says I am running at like 4-5k all the time. Did you ever figure out what the problem was or how to fix WaWaZat?

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    Re: '05 Sunfire Erratic Temp Gauge

    Quote Originally Posted by Jfire05 View Post
    This same thing just happened to me the other day. I thought my car was overheating so after I shut it off and turned it back on later, the gauge was all messed up and pinned to the right as well...it also messed my tach up too. It says I am running at like 4-5k all the time. Did you ever figure out what the problem was or how to fix WaWaZat?
    No, just left it... haha. The prob comes & goes with different gauges. The temp gauge went back to normal for a while then the tach started acting up. Now it's the speedometer... sometimes says we're doing about 125 when we're cruisin' at 40. Not a great way to keep a serious eye on things but fun to think of the car as having a whacky personality.

    Seems this is a common prob and the only way to fix it is to have the cluster repaired... expensive, or buy a new one... also expensive. Perhaps you may have luck with a junkyard/ebay find.

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