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Old 10-04-2021, 01:30 PM   #1
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Transmission question.

Posted on Allison transmission form but thought I’d ask here as well.

Originally Posted by kketterling View Post
I have a Allison model HD3000MH in my MH and got the following trans check codes. D2p0722 and d1p0721. Based on code info it relates to transmission output sensor. I’ve ordered the sensor but would like to verify the code.


I should add the symptoms I experienced with the coach with these codes. Speedometer went to zero, transmission would not shift up or down and D on trans selector not lit up. If I turn engine off then back on everything works for less then a mile then issues repeat.
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Old 10-04-2021, 02:45 PM   #2
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Note also that you can throw codes when there's a dirty connection that's intermittently open circuiting. Requires climbing under the RV and chasing out the wiring for it as it will likely go to another several other junction boxes with connectors. Those should all be checked. Since they tend to be automotive type connectors, I usually just wipe off all the dust and dirt, then partially disconnect and reconnect a few times in order to burnish the contacts. Saves getting any grime inside. I always use a strong light and carefully check the wiring all the way from one point to the next too.
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Old 10-07-2021, 07:50 PM   #3
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Quote:
Originally Posted by kketterling View Post
Posted on Allison transmission form but thought I’d ask here as well.

Originally Posted by kketterling View Post
I have a Allison model HD3000MH in my MH and got the following trans check codes. D2p0722 and d1p0721. Based on code info it relates to transmission output sensor. I’ve ordered the sensor but would like to verify the code.


I should add the symptoms I experienced with the coach with these codes. Speedometer went to zero, transmission would not shift up or down and D on trans selector not lit up. If I turn engine off then back on everything works for less then a mile then issues repeat.


Just a followup. Installed new transmission output sensor and everything now is working correctly.
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Old 10-09-2021, 10:54 PM   #4
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Nice to get the follow up

Thanks.
I wish everyone that solves their issue would take the time to report back with the answer. I appreciate it.
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