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Allison transmission will not go in reverse - 2005 GMC Sierra 2500HD 4WD

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Where is the speed sensors located on a 2001 Tahoe


Vehicle Speed Sensor (VSS) - Allison
On the left side of the transmission
Automatic Transmission Electronic Component Views in Automatic Transmission - Allison
Automatic Transmission Inline Harness Connector End View in Automatic Transmission - Allison
Vehicle Speed Sensor (VSS) - 4L60-E
On the left side of the transmission
Automatic Transmission Electronic Component Views in Automatic Transmission - 4L60-E
Automatic Transmission Related Connector End Views in Automatic Transmission - 4L60-E
Vehicle Speed Sensor (VSS) - 4L80-E
On the left side of the transmission
Automatic Transmission Electronic Component Views in Automatic Transmission - 4L80-E
Automatic Transmission Related Connector End Views in Automatic Transmission - 4L80-E
Vehicle Speed Sensor (VSS) - Transfer Case
On the top left side of the transfer case
Transfer Case Control Component Views in Transfer Case - NVG 246 - NP8 (Two Speed Automatic)
Transfer Case Control Connector End Views in Transfer Case - NVG 246 - NP8 (Two Speed Automatic)
Vehicle Speed Sensor (VSS) Adapter (4WD Only) - 4.8L,5.3L,6.0L
On the left side of the transmission
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Engine Controls Connector End Views in Engine Controls - 4.8L,5.3L,6.0L
Vehicle Speed Sensor (VSS) Adapter (4WD Only) - 8.1L
On the left side of the transmission

Mar 07, 2016 | Cars & Trucks

2 Answers

Cannot going in reverse at all


According to Allison on Answers.Youhoo.com: " If you cannot go in Reverse but can go forward it is your transmission. It could be the synchroniser, the gear itself or part of the actuating system, but if it's inside the transmission (not linkage on the outside) it's sometimes easier to replace than take apart, diagnose and rebuild. Not all mechanics feel comfortable working on transmissions, too, so you may want to have a specialist look at it before you pay anyone anything." Usually you are looking at having to rebuild your transmission. Sorry.

Apr 12, 2015 | 2000 BMW 328i

1 Answer

What is wrong with my allison 5 speed transmission


possible that the sensor which senses the gear selector position is going bad.

Jul 15, 2014 | 2005 Chevrolet Impala

1 Answer

My allison wont go in reverse


The first sign of transmission failure is no reverse

Jul 01, 2014 | 2009 Chevrolet Silverado 2500HD

1 Answer

ALLISON AT545 NO REVERSE


Shift solenoids on the valve body inside the transmission or the transmission control module will cause that if it's electrical. Clutch packs if it turns out to be mechanical.

Sep 23, 2012 | Cars & Trucks

2 Answers

P0708 code, cleared , came back. Seems to work fine. 03 chev k2500 6.6 allison Lee


hi this has something to do with the transmission, you have either a short on the positive side of the transmission range sensor or the sensor is u/s or becoming that way, your best bet would be to take it off and test for a short, or see if a wire has broken...hope this helps

Nov 04, 2010 | Chevrolet K2500 Cars & Trucks

1 Answer

01 duramax allison changed fluid and filters now in limp mode


Make sure you have the proper amount of tranny fluild in it and get that Valvoline fluid out of it. Allison transmissons have there own type of tranny fluid and you want to use it. You can buy the right stuff from a Allison dealer. Most Detroit Diesel dealers are also Allison dealers. Look them up in your phone book and they will tell you the quanity and sell you five gallon pails of the fluid. Just get the serial number off of the side of the transmisson before you call. Change the fliters again too. Believe me, this is important. My company has Yard horses with Allison transmissions and you don't want to screw with the small stuff. Service them right and they work as hard as you want.

Aug 01, 2009 | 2002 Chevrolet Silverado

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