Question about Cars & Trucks
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Hi mate I had the same problem with a camper once and the only way that you will ever stop it from shifting hard into gears down shifting or up is to take it into a Detroit Allison work shop and ask them to reset the throttle position and reset Un-adaptive shifts then to do an Fast-adaptive shift with the electronic tool called Allison Doc.
Ask them also to do a clutch report on the electronic tool, that will tell you straight away the condition of the box on the inside.
Thats the problem with these new electronic transmissions they force you to go back to the suppliers. If I had my book here I could have helped you with the fault code but you would have had to take it in any way to get all the parameters reset.
What happens is that when you buy this trans new they set it to UN-adaptive shifts then to fast adaptive then it learns how long the solinoids should be open and how quick to open them to have a good shift, but over a few ignition cycles the fast-adaptive changes to normal over a year or two the clutch plates wears with a few 001 and the computer cant keep up have to be reseted which is normal to them, expect to take it back every year or two to be reseted.
Posted on Aug 22, 2009
Tips for a great answer:
May 07, 2017 | Cars & Trucks
Apr 09, 2015 | Cars & Trucks
Oct 21, 2014 | 2001 GMC Sierra 2500HD
Nov 28, 2012 | Cars & Trucks
following are the general instructions on the start of diagnosing any
electronically controlled engine or transmission problem.
The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM or ECM,ECU), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.
Nov 14, 2012 | 2002 Chevrolet Silverado 2500HD
Oct 13, 2011 | 2000 Jeep Cherokee
May 25, 2011 | Jeep Liberty Cars & Trucks
Nov 03, 2009 | 2007 Chevrolet Silverado 3500HD New Cars
Mar 20, 2009 | 1999 Ford Super Duty F 450
Sep 22, 2017 | Ford Cars & Trucks
73 people viewed this question
Usually answered in minutes!