How to reset oil change light on a 2006 Chevy Kodiak c8500 with Cat motor and Allison auto trans?

auto trans ? have the fluid topped up changed as could be sticking until it gets more power

take it back to the dealer and have them reset the oil change data on the computer.. thats the issue with this jeep we have here .. they did not reset the oil change interval in the computer..simple fix.. sorry they overlooked it or the tech got lazy..

you should make a diagnostic to know what happened to your car
of course you need an auto diagnostic tool : http://www.chinasnoy.comand you can find all kinds of tools in chinasinoy.com

This is part of the new Allison Prognostics. It's very similar to the oil life monitor on the new cars.

The way to clear the filter light after the filter is changed is to:

Turn the ignition on, but do not start the truck

Next move the shift selector in this sequence, N-D-N-D-N-R-N, do not stop the sequence for more than 3 seconds once you start.

This should turn off the filter light.

I would start
by changing both trans filters and fluid, makesure you put dex VI in trans then if still having problems take to someone with a Tech 2 scanner and have them reset the trans adapts and try that, what it does is resets trans to factory (new) mode and then as you drive the truck it will adjust to your driving habits and shift points, but loosing pressure makes me think one of your filters is partially plugged...there is a spin on cartridge and the internal one in pan, change em both..good luck

{: ) It could be that it was not reset properly and successfully when you last changed your oil. A scan tool can reset it better. Also, double check for oil level and leaks.

Hi and welcome to FixYa, I am Kelly.

Most all GM vehicles reset the "change oil light" in one of 2 ways:

See this link because it does the best to describe the steps and would rather the author got the credit writing the article:
http://www.ehow.com/how_4663244_change-oil-light-gms-chevrolet.html

If this does NOT work for you respond here and I will dig deeper noting you have the CAT engine. It is in the owners manual but if you are not the original owner you may not have the manual.

Thanks for choosing FixYa,
Kelly

14.8 pints according to my online resources.
2 pints per quart means it's 7.4 Quarts total.
That's a nice transmission and engine combination.

But, I've been told by my local Quality Transmission shop, that flushing and filling is better than changing the filter and oil. And, although they work on transmissions, they leave it up to another garage to do that kind of work, because they're too busy with rebuilding transmissions.

Every 30,000 mi. the transmission should be flushed and filled with new transmission fluid, I've been told.

Most often you need a code reader with a reset function that can connect to the computer jack under the dash and reset factory functions like that. Pain in the tush if you are changing your own oil. Mechanics and dealers have the equipment to do that reset.

change the trans oil our it could be low