Not shift into 5or 6th gear

corya802

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Ram Year
2007
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A while back my truck wouldn’t run garage said the room was bad replaced didn’t completely fix issue changed ecm before all this exhaust brake and trans shifted correctly after replacement of said parts will not shift past 4th and no exhaust anyone had this same issue where should I look
 
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corya802

Junior Member
Joined
May 28, 2022
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Location
Vermont
Ram Year
2007
Engine
6.7
The exhaust brake doesn’t work either seems like it goes from first right to fourth
 

crash68

ACME product engineer
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The exhaust brake doesn’t work either seems like it goes from first right to fourth
Sounds like the transmission is in limp mode, something it telling the transmission controller there's a problem internal to the transmission.
 
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