lmm duramax cruise control not working

98_tj

98_tj

under water
Joined
Feb 7, 2014
I am having trouble trouble with my truck's cruise control. I have checked all of the brake lights and replaced the brake switch. I have no idea what else could cause this

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The brake switch in my 02 crapped out on the cruise circuit. I tried a new one and it wouldn't work, so I wound up having to take the parts out of the new one and putting them in the old one's case. Not sure why it wouldn't work in the new one...
 
98_tj said:
I am having trouble trouble with my truck's cruise control. I have checked all of the brake lights and replaced the brake switch. I have no idea what else could cause this

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^^^^ I did the same to mine and it hasn't worked in six years. If you figure it out, please post up the solution!
 
from what I have found online it could the the BCM has gone bad, but that would require being flashed by a dealer.

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I'm not sure where you are located but I've got a good scan tool and can communicate with the bcm and see what's going on. I'm in rutherfordton.
 
Oh yeah...now I remember! The plunger that the brake pedal pushes to break the connection and cut off the cruise control wasn't the same, so it wouldn't let the cruise work. Seriously...try it. I figured it out with a multimeter checking continuity.
 
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