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Allison 1000 02 workhorse w22

calfman47
Explorer
Explorer
02 workhorse 90 k transmission toque converter is locking and unlocking
When pulling a steep grade in 3ed gear.
I’ve never had an issue with it and all my maintance is up to date.
Does anyone know of a controll mod or fix for the issue.
I do get a check engine light when it happens and then it clears
Itself after a while or after restart.
Also it doesn’t happen every time I pull a grade.
dan gunter
9 REPLIES 9

rgatijnet1
Explorer III
Explorer III
It's always good to be able to make it to your home base to deal with a problem. Hopefully it will be an uneventful trip. You can always manually shift it out of OD in those occasions when you do not want the transmission to shift in and out of OD on it's own.

calfman47
Explorer
Explorer
I had the transmission check and no codes showed up
I tried a can of Seafoam trans conditioner and it’s
Not locking and unlocking except on occasion.
I’m in the Rockies now and I think I can make it home.
dan gunter

calfman47
Explorer
Explorer
This has all been good information and I’m very thankful
For your reply’s.
I did talk with a Allison service guy that has the proper
Scanner for the transmission.
He said you can maybe find the problem by changing some parts
But it could be that it’s not anything but a tweet or program change
Upgrade ECT.
$150 to scan it and $150 pur hour for labour.
It may be in my best interest to limp in to his shop and give him a shot at it
I’ll try to let you know how it turned out.
dan gunter

allbrandauto
Explorer
Explorer
my 2006 w22 Allison did the same thing 3000 miles after buying new was told the connecter at the module was missing insert did think that was the problem being I own a automobile shop waited 2 weeks for part when I got it back did the same thing decided to fix my self found torqe converter soliniod was reading wrong resistance droped the pan and replaced it in my driveway have never had a problem again you need to plug a scanner into obd2 plug that has workhorse solftware and read code will probably have a po700 code and another code in the 700 hundreds

ArchHoagland
Explorer
Explorer
Really need to know what the Check Engine Light code is.

It may not be a transmission problem at all.
2004 Monaco La Palma 36DBD
Workhorse W22 8.1 Gas Allison 1000, 7.1 mpg

2000 LEXUS RX300 FWD 22MPG 4020 LBS
US Gear Brakes

Hank_MI
Explorer
Explorer
Read the codes from the check engine light. It could be the engine telling the trans to unlock because it senses an issue.

WILDEBILL308
Explorer II
Explorer II
Let us know what you find out.
Bill
2008 Newmar Mountain Aire
450 HP CUMMINS ISM
ALLISON 4000 MH TRANSMISSION
TOWING 2014 HONDA CRV With Blue Ox tow bar
A man who carries a cat by the tail learns something he can learn in no other way.
-Mark Twain

calfman47
Explorer
Explorer
Thank you.
dan gunter

rgatijnet1
Explorer III
Explorer III
You may just need a firmware upgrade to your transmission control module. Any Allison shop should be able to see if your control module is up to date and correct it if it is out of date.
Also your engine control module, ECM, may be feeding incorrect information to your transmission.
Find a shop that has the proper diagnosis equipment and they should be able to pin point the problem without throwing expensive parts at the problem while you foot the bill.