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Old 03-06-2006, 04:16 PM   #1
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I had an incident this past weekend that I thought I should pass along because the info might help someone else in the same situation.

Those that have the Workhorse know how difficult it is at times to read the gear selector display so will understand how I made the mistake of not getting the thing all the way into Drive when I shifted out of Park after a stop. The transmission was still in Neutral when I stepped on the accelerator to move out, causing the engine to rev up. Impatient self moved the selector into Drive before the rpm had settled all the way back to idle. The engine wasn't screaming but was probably a bit over 1,000 rpm.

The transmission went into gear but would not shift out of Low. That was when I saw that the transmission warning light (a gear icon) on the dash was on. I pulled over as soon as I was able and got the manual out. What I found was that I had apparently tripped an alarm condition that is triggered by shifting from Neutral into Drive with the rpm over 900. That causes the light to come on and shifts to be inhibited.

The manual wasn't much help about what to do except to get it to a service center. Fat chance of that on a Sunday. I was only a short distance from my destination so limped in and shut it down, thinking I would call for help the next day. However, after letting it sit over night I restarted and all was well.

Be careful to avoid over-speed shifts.
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Old 03-06-2006, 04:16 PM   #2
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I had an incident this past weekend that I thought I should pass along because the info might help someone else in the same situation.

Those that have the Workhorse know how difficult it is at times to read the gear selector display so will understand how I made the mistake of not getting the thing all the way into Drive when I shifted out of Park after a stop. The transmission was still in Neutral when I stepped on the accelerator to move out, causing the engine to rev up. Impatient self moved the selector into Drive before the rpm had settled all the way back to idle. The engine wasn't screaming but was probably a bit over 1,000 rpm.

The transmission went into gear but would not shift out of Low. That was when I saw that the transmission warning light (a gear icon) on the dash was on. I pulled over as soon as I was able and got the manual out. What I found was that I had apparently tripped an alarm condition that is triggered by shifting from Neutral into Drive with the rpm over 900. That causes the light to come on and shifts to be inhibited.

The manual wasn't much help about what to do except to get it to a service center. Fat chance of that on a Sunday. I was only a short distance from my destination so limped in and shut it down, thinking I would call for help the next day. However, after letting it sit over night I restarted and all was well.

Be careful to avoid over-speed shifts.
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Old 03-06-2006, 05:00 PM   #3
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Thanks for the info "hwybnb" built in protection by ALLISON.
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Old 03-06-2006, 07:12 PM   #4
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Does anyone know what caused the reset? Was it the time it sat before a restart? Was it the number of restarts with no error?
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Old 03-06-2006, 07:36 PM   #5
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Full-Timers, I think the ECM talks to itself and says what fool mistake has this driver put me in now. Waits a spell and desides to give us another chance and allows us to start her up again. When I had the water problem would wait a spell after power down and it would restart, didn't have to try three times that maybe for the engine light to go out. "007"
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Old 03-06-2006, 07:38 PM   #6
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After posting this on another forum a WH owner posted that he was able to clear the alarm and lockout immediately by moving the selector lever from Drive through the lower gears and back.

Neither the WH nor the Allison User's Manual gives any information on the subject.
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Old 03-07-2006, 06:40 AM   #7
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Shutting down the engine and waiting for a few minutes before restart, cures a number of situations that most often just go away.

If you do shoot a code and the problem won't go away, the code gets stored in the ECM but you can normally resume your trip until you have a chance to visit a service center to have the code evaluated and cleared.
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