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Unread 10-01-2006, 02:55 PM   #1
boldknight
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2001 WJ Trans Over Temp Light

Hi All:

I had all my oil fluids changed at 80,000. All meet specs! That was six months ago. In the last three months, the "Transmission Overtemp" Light comes on when climbing a grade. Putting it in "No O/D" doesn't help. I am also getting a Code P0 740 before this happens. I have an OBD reader and have reset this and it comes right back on. In researching this it could be a bad speed sensor? But, the Trans Overheating is a worry. The possibility is scary that it may be the torque converter and it is actually slipping, ergo the overtemp?

Anyone else have this problem and if so, what was the outcome? All suggestions welcome. No, I can't afford a complete new tranny at this time....who can?

Thanks,

BK

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Unread 10-01-2006, 02:58 PM   #2
Woody
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I bet you have a bad sensor.

It's probably a selenoid rather than a speed sensor, but that's my opinion. I'd have it checked soon, because tranny repairs get expensive after you overheat them.
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Unread 10-01-2006, 04:09 PM   #3
brandoncrone
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It isn't going to be a speed sensor. If it was the trans would be going into limp-in mode. If the trans controller is detecting overheating you most likely have slippage going on already. Recently the 45RFE (which is what you have since you have a V8 engine) has been having oil pump problems on older units which are starting to rack up mileage now. Ive done several this year and the pressure regulator in the trans oil pump is failing causing massive clutch damage including the torque converter. P0740 is a code generated by the PCM when there is a code stored in the transmission module to turn the check engine light on. It serves no purpose other than to turn on the light. I would get it someplace soon, before it gets more expensive than it may be already.
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Unread 10-01-2006, 04:40 PM   #4
boldknight
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Quote:
Originally Posted by brandoncrone
It isn't going to be a speed sensor. If it was the trans would be going into limp-in mode. If the trans controller is detecting overheating you most likely have slippage going on already. Recently the 45RFE (which is what you have since you have a V8 engine) has been having oil pump problems on older units which are starting to rack up mileage now. Ive done several this year and the pressure regulator in the trans oil pump is failing causing massive clutch damage including the torque converter. P0740 is a code generated by the PCM when there is a code stored in the transmission module to turn the check engine light on. It serves no purpose other than to turn on the light. I would get it someplace soon, before it gets more expensive than it may be already.
Oh My... I was afraid you would say that. I was sure hoping it was the TCM screwing up things, but you seem to be the expert with all your experience. I am guess I am looking at $1800 to fix the tranny to normal gain. A lot of $$$$$ I don't have. I bought this vehical a year ago and noticed about four months ago that all the dash lights did not come on when I "Keyed up!" Well, I pulled the instrument panel and you guessed it, the check engine light and "Trans Overtemp" light bulbs were missing. I hate it when I get "ripped-off" by others. (*sigh*)
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Unread 10-01-2006, 05:38 PM   #5
brandoncrone
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That really sucks. It should be good to know that new instrument clusters don't have replaceable bulbs, they use LEDs now.
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