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Output Speed Sensor Error
Twice on this weekend’s trip I lost power pulling off from a light. The first time I pulled over and it seems to have solved itself. I don’t recall the error code, but after sitting still for a few minutes while I pulled out my Allison manual (because of the Check Trans light) it drove normally again.
On the way home today I again had to limp to the side of the road with the same Check Trans light and found error code d1 2216, which translates to the Output Speed Sensor. This time it resolved with an engine off-engine on cycle.
What should I think about this? Is it a fluke, or harbinger of bad times to come?
If I have to take it in, do I drive to Prevost or find a tranny shop in Tampa?
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4 Replies
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Karl,
If that happened to me I would contact an Allison dealer or their customer support and get their opinion and advice.
The code is likely stored so you may have to have an Allison dealer hook it up and get the codes to learn more than what you can tell them.
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I would think that any shop that does Allison work should be able to diagnose it. Shouldn’t be a hard fix unless it is internal to the case and then it could be. I am sure Prevost could also do it, but if you are closer to a truck shop that does Allison, I would try there first….
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Just so’s you know what happened….
I took it to TransDiesel in Lakeland, Florida. It wasn’t until I got there that they said it could be the wire and that would have to wait until Monday, which was a problem because I didn’t bring the toad.
We took a diagnostics drive and it looked like it was the output speed sensor as the code indicated, though it didn’t want to be totally obvious and make my life easier.
They replaced the sensor in about an hour and, $461 later, I was on my way. It seems normal. Until it fails at another stop light I guess it IS normal…..
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Glad you got it fixed, at least you were close to home and not on the road.
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