-
transmission stuck in 1st gear
Once when I started my engine the bus would not move forward or backward, I tried to shift gears but the trans display showed 1. I turned off the key and waited and then started up again and put it in gear and it went into gear and had no more trouble for several thousand miles.
Later when I returned home , filled the fuel tank , put it in gear and started forward I noticed it stayed in 1st gear and would not shift. Again I shut the engine down and when I started up again it went into forfward and acted normal. Have made several trips of 600 or so miles and has not happened again. Talked to allison transmission and got no answers, said if it continued bring it in and maybe something could be found.
Anyone had this problem?
Bill
-
6 Replies
-
Bill,
One of our members just had this problem on the way home from the 3 Amigo deal and it was speed sensor I believe on the tranny. Got it replaced and he was on his way.
-
Bill,
On our original coach we got a “do not shift” alarm. Whatever gear it was in the transmission would not shift up, down or get out of the gear. If it was in 5th gear and we needed to slow or stop it remained locked in the gear to the point it would stall the engine if we got too slow. In that case it was a faulty connector plug that sent a bad signal to the brain. It could have been a sensor.
The transmission has a number of sensors that allow it to function as intended, or which can block if from operating. In my case due to corrosion on the connector the transmission thought it was 20 below zero so it would not shift. That transmission needed to be at an operating temperature of plus 20 before it would shift. The only way the tech could isolate the cause was to have the reader hooked up while it was in that mode while we were driving and he saw that the transmission had bad temperature information, concluding the sensor was bad or the signal was corrupted.
An intermittent problem drives you and technicians nuts. It sounds like you need the problem to be happening when the computer is hooked to the coach.
-
It sounds like a sensor of some kind, I called back and talk to the service manager and he told me it probable will l be hard to find unless it is acting up when they hook the computer to it. There is a speed sensor on the front of the transmission, maybe clean the connections, I will try this and see if it helps.
-
Are we talking about a 755 (5 speed with 8V92) or the World 6 speed?
My old 755 was VERY sensitive to fluid level and would give me a ‘do not shift’ when slightly low.
-
Bill has a 2006. If the transmission brain retained faults he would have no problem. But intermittent stuff is impossible to identify unless the reader is hooked up when it happens.
-
Don’t know if you got it fixed, but in our case was the speed sensor on the transmission. According to the tech there was an inherent problem with the canon plugs at one point that required the early version to be replaced . In my case the sensor actually failed, good news was it was plug and play. I have to say the DD dealer in Nashville came through,Sunday morning roadside fix. I will dredge up their name later, ironically of the 6 names I got from PASS, who couldn’t help me , they weren’t on the list. If its intermittent, sounds like connector.
Log in to reply.