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  #1  
Old 09-08-2014, 11:52 AM
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Transmission Over Temp light goes on then right back off

Just recently my Trans over Temp light comes on and then goes right back off. I changed my Coolant Temp Sensor, and it is still happening. My transmission is shifting just fine, and the light only comes on when I first start driving. Does anyone know what this issue is? 2002 Jeep Grand Cherokee Laredo 4.0L

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  #2  
Old 09-08-2014, 11:54 AM
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Re: Transmission Over Temp light goes on then right back off

There is a transmission temperature sensor inside the transmission. It is in fact one part together with the governor pressure sensor. The temperature signal is send to the PCM (Powertrain Control Module), from where it goes to the instrument cluster. Since the light comes on with a cold transmission, i would more think of a bad contact (corroded or moisture) or a wire problem (shaved or internal break). It could eventually be a problem in the instrument cluster or the PCM.
I would start cleaning the connectors on the transmission and PCM with contact spray. (disconnect the battery before removing these connectors)
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Old 09-08-2014, 12:19 PM
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Re: Transmission Over Temp light goes on then right back off

I do not know much about the wiring, is there a site that I could go to? This just started occurring, my trans is shifting fine.
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Old 09-08-2014, 04:09 PM
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Re: Transmission Over Temp light goes on then right back off

Im not aware of any site, eventhough there probably is something out there. Thinking further on a possible wire problem, the question would be, why does it only appear just after start and not thereafter anymore. Does it every time appear at every start, or was it only when cold?
Try the instrument cluster test, to see if you see anything strange with the overheat light: with ignition switch in off, press odometer reset knob and switch ignition in run. All lights should come on and go out again. You can release the odometer reset knob, while the test continues. Anything strange to see during the test?
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Old 09-08-2014, 04:24 PM
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Re: Transmission Over Temp light goes on then right back off

I have tried that and it goes off like normal. The light comes on about two to three blocks after I have started driving.
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Old 09-08-2014, 06:15 PM
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Re: Transmission Over Temp light goes on then right back off

Try cleaning the connectors on the transmission and PCM and see if that helps.
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