chevy 6 speed automatic transmission problems

#CHEVY 6 SPEED AUTOMATIC TRANSMISSION PROBLEMS CODE#

GM sent a letter to customers advising them to bring it in and get it replaced. If you have an Allison Transmission in a GM Truck from the mid 2000’s there is a service bulletin for the TCM module. If it feels like it is shifting toward the engine red line you could have it hooked to the wrong port. If it’s shifting to early and bogging, you may have it in the wrong port. Modern transmissions are computer controlled, but if you are working on your tank (they made transmissions for them in WWII) or your classic vehicle you may wish to take a look at the vacuum lines.

It will go away after enough engine on/off cycles where the problem is no longer recognized.

#CHEVY 6 SPEED AUTOMATIC TRANSMISSION PROBLEMS CODE#

The best way to do so is to get a code scanner and scan the code to wipe it. Either way, you’ll probably want to clear the trouble codes. If you’ve experienced one of the issues above, it may very well be time for a rebuild. So if you’ve gotten a tune recently and you’ve found your way to this page try asking if they could take the tune back to the factory specs. Even just a little bit extra slip put into the tune, and an Allison Transmission can have problems. Performance Tune: Often, when people get an engine tune they don’t realize it should really be a driveline tune. Heat issues are the number one killer of this transmission. They can be found cheap on Amazon and don’t require a lot of mechanical knowledge to install. If you are noticing this problem during hotter weather, you may be able to keep it from happening by installing a transmission cooler. Third gear should pull a load fast enough on the highway, but it can be challenging to get a load moving.Įxcessive Heat: If the transmission overheats, that can cause it to slip as well. This is certainly can be an inconvenient time for this to happen. Towing: If you are towing a heavy load (especially up a steep grade) you can often activate the limp mode. Here are some common conditions that can trigger a limp mode situation. The limp mode is often activated by things an excessive of slippage by the transmission. You don’t want to get stuck somewhere that you can’t back out of. It also keeps the transmission from going into reverse! Keep that in mind. This limp mode locks the transmission into third gear, and keeps the torque converter from locking up. You should always assume that this isn’t “bogus” and try and get your transmission. This is a different shift table that allows the transmission to protect itself from catastrophic failure. Modern Allison Transmissions come with a limp mode installed. The odds are pretty good that you’ll never find your way here, but if you did lets get this figured out!

Allison Transmissions have been around for a hundred years and have set the industry standard for durability. This short guide is will hopefully help you diagnose simpler Allison Transmission problems.

Chevy 6 speed automatic transmission problems