I'm new at this and not so good with computers, so I had a Trany problem, and just see'n if someone could help, Thanks have a good day!
Help , trans problem
- Thread starter chevygal21
- Start date
Well, the check engine light comes on, and when you go to stop fast it just shifts down hard(bang)! No codes comen on. It seems to not want to shift down all they way, and sometimes it won't even go into gear when I go to take off!
Step one is to change the spin-on Allison filter.
You really need to find out what the error codes are that set off the CEL (check engine light).
You really need to find out what the error codes are that set off the CEL (check engine light).
Mike L. is the Obi Wan Konbi of the Allison, (but he looks like Yoda). Hopefully he sees this thread.
Harse downshifts and not full trans operation sounds really familiar. Neutral Safety Switch?
Tell us the year of the truck, mileage, and any modifications you have done.
Harse downshifts and not full trans operation sounds really familiar. Neutral Safety Switch?
Tell us the year of the truck, mileage, and any modifications you have done.
2001, 191,000 miles, none, and a chip that has never worked ever since we bought the pickup 6 months ago.
If you can't read the codes, the neutral switch is a common problem on that year, and is not expensive if you buy it at an Allison dealer. It's on the driver's side of the trans.
NSBU is it's name. Do a search here on NSBU and see what you find.
NSBU is it's name. Do a search here on NSBU and see what you find.
Get the codes read before you start throwing money at it. Remove the chip and see what happens. Possable NSBU problem or spin on filter problem. The clunk is telling you the computer sees something it doesn't like and has gon into a different strategy.