Allison Transmission Stuck in Second Gear On a School Bus - Engine Power Loss Diag & Repair Part 1

in this video I'm gonna share with you how to diagnose and fix a Transmission that doesn't shift in a Blue Bird School Bus! This is Part 1 Of a 2 Part Video! #transmission #schoolbus #allisontransmission

[@Mustang8846]

I just watched parts 1 & 2. You and your Brother performed tedious troubleshooting on this issue which was excellent. Keep up the great work and sharing these important troubleshooting steps. Thank you.

[@KITS_Auto_and_Truck_Repair]

@Mustang8846 My Pleasure! Thank you!

[@ivanpeterzell695]

Very good. Looking forward to part 2.

[@KITS_Auto_and_Truck_Repair]

@ivanpeterzell695 Thank you! Part 2 will be out soon and I'm sure you will enjoy it!

[@johnnylee948]

Great work!

[@KITS_Auto_and_Truck_Repair]

@johnnylee948 Thank you!

[@buboybebing3716]

hello my friend,

[@KITS_Auto_and_Truck_Repair]

@buboybebing3716 Hello my friend!

[@robertfoilesjr1337]

I like the power and ground test but am confused about testing can bus signal with harness off TCM unless testing PCM COM to TCM. I need to know which direction or who know sending and which is receiving. I’d expect have to check both ways to find the fault? Thank you.

[@KITS_Auto_and_Truck_Repair]

@robertfoilesjr1337 My Pleasure! Testing the network with the TCM disconnected allows me to know that the CAN bus system is good up to the TCM and in this case if the TCM is bad it can short out the network which can mess up the voltages on the network, because a shorted module may pull down the network... Part 2 is coming out soon, you will see what I found after doing these tests!

[@robertfoilesjr1337]

Thank for the explanation. Makes sense.

[@aymenmohamed1134]

👍👍👍

[@KITS_Auto_and_Truck_Repair]

@aymenmohamed1134 Thanks!