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Thanks, Bob, I'm a blessed husband and father. Great team, it's been really good for us. Just stopped for the night in North Las Vegas, passing on the strip this time. Truck will stay idling during a short night as we take turns in it and a hotel room. Final stretch tomorrow through heaviest...

Replaced output speed sensor, corrected problem, ready to roll. Will stop around St. George, UT for short overnight, again with engine to. Should be home tomorrow afternoon. Will post updates. Sent from my 0PJA2 using Tapatalk

Allison tech found that the output speed sensor (OSS) was shot. From the error codes we were researching, plus the non-functioning speedometer, that seems to make sense. Part is on order, earliest arrival in 48 hours. He was not able to get communications with the transmission control module...

Got a tech on site to check out the Allison. Sent from my 0PJA2 using Tapatalk

Bob, we checked that voltage in the connector again, reading 25v. Sent from my 0PJA2 using Tapatalk

Thanks for all the assistance tonight. One more post - some pictures of the good times when we were rolling through Montana and Utah. My wife was having a blast driving it - really enjoyed it. Second photo is the amber LED warning lights for night driving. Last shot is at a lunch stop...

The P0721 (most recent error code) is interesting. Found several references saying that it's related to shaft speed sensor signal. Starting with the sensor module itself, other downstream problems could be wiring issues, etc. before it gets to the TCM. Sounds like this kind of error could be a...

NDT, that could explain current behavior, googling codes now. Will also look for Allison support here in SLC if we need to go that route. Sent from my 0PJA2 using Tapatalk

Still have power to the dash, tried jumping across the starter solenoid with a screwdriver, got an arc but not hing from the starter motor. Sent from my 0PJA2 using Tapatalk

P0721 P0880 P2685 P2812 P0974 Sent from my 0PJA2 using Tapatalk

It's unplugged, no change. Retracing our exact steps the other day when we bypassed the LBCD. Sent from my 0PJA2 using Tapatalk

Thanks suprman, yes, the LBCD is still bypassed, both 12 and 24v sides. Will try unplugging and replacing the military connector. Then retrace our exact steps we did the other day. Be right back. Sent from my 0PJA2 using Tapatalk

Went ahead and shut down because we can't leave it running in gear. Waited 10 minutes and attempted a restart. Dash came up as it should, trans controller displayed NN, tried starter button with no response, no relays activating in the PDP, although Neutral Start relay is energized as it should...

Mode is the only function that worked on the controller. Sent from my 0PJA2 using Tapatalk

No, but it did go into mode and back out again. Sent from my 0PJA2 using Tapatalk

Battery Gage's on dash read 28v and 14v. Sent from my 0PJA2 using Tapatalk

We're in Salt Lake City. Found a thread by tennmogger with identical symptoms, it was also raining here, also. Water in the WTEC could be an issue. Sent from my 0PJA2 using Tapatalk

Need help!! Transmission is stuck in 4th gear, we are stopped. Left display digit on controls is dark, right is 4. We were driving in stop and go traffic on a freeway when we noticed left display digit was dark, then noticed it was not shifting out of 4th. Searching on internet, found...

Just south of Pocatello, ID, going well. Good roads on I-90 & I-15. Except for a few construction zones with one lane each way, roads have been smooth sailing. Hit a couple of sections with 6% grade yesterday while still in Montana; no problem. Stopping about every hour to stretch our legs and...

Just settling in for a night stop in Dillon, MT. Making good time with three of us. Truck is again idling in the parking lot, and we're doing split shifts so that one of us is always with it. The truck has been running great all day with no issues. We're getting more used to how it handles, and...