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Thread: Lost 1st gear and Overdrive????
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03-22-2010, 06:30 PM #1
Lost 1st gear and Overdrive????
Okay, I was driving home this Sunday after my weekend drill (Army National Guard) and about 30 minutes driving I lost overdrive and my SES light came on. Luckily I was in town driving and didn't mind driving in 3rd the last few miles to the house. Well, I decided just before getting to the house that I would pull over and shut the car off and restart to reboot the PCM. I put the shift lever into 1st and magically it was back again!? WTF??? So, I guess the restart re-corrected the problem but the SES light is still on. I haven't drove it since I got it to the house. This isn't the first time this has happened. It has done this 3 times total since the trans overhaul last year. I've only put near 8k on it since then. Installed a non lock-up stall (trans builder made necessary adjustments needed for this) at the same time. Does any one have a clue what the problem may be? Is this common with the 4L60e?
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03-23-2010, 08:38 AM #2
wow, 13 views and no response yet? come on guys help me out here please.
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03-23-2010, 04:15 PM #3
- Join Date
- Apr 2008
- Location
- Madison, WI
- Posts
- 7,006
1999 Formula WS6 M6-sold- 2001 Silverado Z71
Take it easy there . I know these trannys well so I'll do some thinking on this later tonite when I get some more time. Did you have 2nd, 3rd, and reverse? Just no 1st and 4th? Seems more likely to be missing 1st, 2nd, and 4th like what happens when the trans is unplugged.
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03-23-2010, 05:35 PM #4
went to autozone tonight to have it scanned and it showed the P0757 code. i'll search the list in a few. i actually down shifted to see what was what and from D to 3rd no rpm change. did the same from 3rd to 2nd and it down shifted and rpm's jumped as normal and pulled just as hard on WOT. coasted down to 30 mph and again preceded to down shift from 2nd to 1st and nothing happened at all. it would only shift between 2nd and 3rd. once i turned off the car and waited 10 seconds i restarted and went through an up shift procedure 1st to 2nd, 2nd to 3rd, and 3rd to D. all is well and shifting just fine now all the way to autozone and back.
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03-23-2010, 05:57 PM #5
- Join Date
- Apr 2008
- Location
- Madison, WI
- Posts
- 7,006
1999 Formula WS6 M6-sold- 2001 Silverado Z71
So far I've found this bulletin
Originally Posted by GM service manual
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03-23-2010, 08:27 PM #6
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