Dave Houchin Posted May 4, 2021 Share Posted May 4, 2021 The engine is a ISX with 600hp. The speedometer doesn’t work and the trans will not shift out of first. Engine diagnostics revealed problem with adaptive crude control. Took that off line but still wii not shift. Restored crude control. Has anybody experienced this situation. Apparently the speedometer communicates with the trans to shift at certain speeds. thanks, Dave H Link to comment Share on other sites More sharing options...
vito.a Posted May 4, 2021 Share Posted May 4, 2021 Just a guess. Maybe the transmission speed sensor? Its on the rear of the trans which is towards the front on a diesel pusher. I'd check the wires coming out. Link to comment Share on other sites More sharing options...
Upsman85 Posted May 4, 2021 Share Posted May 4, 2021 Allison transmission speed sensor!! Tells transmission when to shift and works speedometer! Link to comment Share on other sites More sharing options...
Dave Houchin Posted May 4, 2021 Author Share Posted May 4, 2021 Thanks I have thought of that too, but haven’t checked it . Also wonder if the sencor could be bad. I have checked to make sure the wires are all plugged into the speedometer. Link to comment Share on other sites More sharing options...
Upsman85 Posted May 4, 2021 Share Posted May 4, 2021 My speedometer randomly stopped and stuck in 1st gear. I replaced speed sensor and that fixed my problem. Link to comment Share on other sites More sharing options...
Dave Houchin Posted May 4, 2021 Author Share Posted May 4, 2021 I am going to check it as soon as I get some blocking under the frame . Want to make sure that big outfit doesn’t decide to lose its air when I am under it. thanks, Dave Link to comment Share on other sites More sharing options...
Hypoxia Posted May 28, 2021 Share Posted May 28, 2021 Wondering if you cured the problem? Link to comment Share on other sites More sharing options...
Dave Houchin Posted May 28, 2021 Author Share Posted May 28, 2021 Yes Installed anew speed sensor on the trans. thanks to responses from 3 individuals regarding the speed sensors. One of those had the exact problem. Link to comment Share on other sites More sharing options...
Hypoxia Posted May 29, 2021 Share Posted May 29, 2021 Do you have the part number? I figure it may happen to me and I have the same drivetrain. Link to comment Share on other sites More sharing options...
Dave Houchin Posted May 29, 2021 Author Share Posted May 29, 2021 It’s a cheap fix— $35 thru Amazon. $118 from a parts store . I will send you the info later. Link to comment Share on other sites More sharing options...
Upsman85 Posted May 29, 2021 Share Posted May 29, 2021 This is oem I replaced on my 2006 dynasty Allison 3000. Link to comment Share on other sites More sharing options...
Dave Houchin Posted May 29, 2021 Author Share Posted May 29, 2021 8 hours ago, Hypoxia said: Do you have the part number? I figure it may happen to me and I have the same drivetrain. Part Koauto 29544139 output speed sensor for Allison trans. My MH has a ISX Cummings 600 hp. $35.99 purchased thru Amazon. it solved a problem that a Cummings mechanic with 49 years experience could not determine was wrong with my MH. His computer indicated the problem was with the adaptive cruise control. if you get a chance , call me and I will give you more details. Dave, 904/616-2617 Link to comment Share on other sites More sharing options...
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