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Old 01-11-2011, 02:04 PM   #1 (permalink)
motoriders
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Join Date: Jul 2008
Location: Chula Vista, CA
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2004 LB7 w/ Allison Trans

Mike,
Steve from DSS in Santee told me to find you and see what you thought about my problem. I have an Allison with 150k miles, and recently started having a few small problems. Started truck in the morning, it was cold, drove down hill out of my house shifted into 2nd gear, then I braked, truck down shifted then went directly into neutral and ck engine light came on. Rolled truck around corner, turned off. Waited 5 min and could get it in gear. Took it to the dealer and they pulled the following codes P0732, P0841, P0875. They did some research and said that it was an unusual problem in southern california because it usually doesn't get very cold. They explained the problem this way:
Truck thinks that the trans is in reverse (because certain electrical contact in valve body is not making up due to cold temperature (46 degree trans temp when code initiated), after a set amount of time like 15 seconds, trans notices that truck is traveling forward, then it shifts into neutral in order to protect itself. They told me I have two options. 1 Replace trans. 2 replace section of valve body. They said it is a triple stack, and they did not recommend replacing only one section as they said it could cause the other sections to fail prematurely. This has happened a few times now, and I would like to do something about it.
Do you have any suggestions? Have you heard of this happening before?
Thanks,
Patrick


Last edited by motoriders; 01-11-2011 at 02:05 PM.
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