Question about 1997 Chevrolet Tahoe
The problem was the shift solinoids we thought, that didnt work, we then changed the vss and realized we are in limp mode. :( We really need to have this vehicle fixed but affraid to drive it
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Posted on Jan 02, 2017
1 st did you fill the transmission after radiator replace ment some lines go to the rad. when you loose fluid it needs to be added and checked. Other wise it sounds like a trans needs to bo serviced.
Posted on Apr 27, 2009
SOURCE: po 751 code 99 tahoe
The solenoids are located in the transmission. There is one for the 1-2 shift point, one for the 2-3 shift point, and one for the 3-4 shift point. You have to drop the transmission pan to access them.
Posted on Apr 10, 2009
SOURCE: vehical stuck in limp mode
This only applies if you have an allison transmission, which based on the problem you are reporting I would guess that you do.
It sounds like your vehicle is stuck in limp mode. This is probably due to a bad NSBU switch(Neutral, saftey, back up) (if you have an allison transmission. Prior to 2002 the NSBU switches had a very poor seal which resulted in water intrusion into the NSBU switch causing corrosion. If the switch is corroded it is likley confusing your transmission. Unfortunatly you cannot repair the bad switch, it needs to be replaced. If you order one through Chevy it will cost around 200 dollars. I found one at merchant Automotive for 91 dollars. ( http://www.merchant-automotive.com/allisonnsbuswitch2001-2004.aspx ).
The switch is relativly easy to replace. the electrical connections are the hardest part as they are glued into the switch. A little heat from a butane torch should soften it up and make the connectors slide off more easily. Other wise you may have to break the NSBU switch appart to remove the connectors.
I replaced the switch for the first time and it took me 15 minutes.
Posted on Apr 22, 2009
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