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2012 HINO 268 P073D

chromepixels007

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Owner/Operator
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good morning i have a 2012 hino 268 with a allison 2200RDS tranmission, truck never had a single problem for the last 3 years
the truck was pulling of a dock and check engine light came on and the transmission gear selector showed E on display, truck was disconected from batteries and work again like nothing happened,
2 months pass and truck was working no problem until it happened again this time was after a shutdown, gear selector showed E on display and truck Wouldnt even try to start completely "dead".

-3 speed sensors for the outside of allison where replaced
parts# 29536408

batteries where pluged back and truck started no check engine light, a couple of seconds after the crank check engine light came on and the gear selector switched from P to E all this happened while the truck was still ON and engine working, truck was turned off and once again it wouldnt start "dead"

- NSBU switched replaced inside the tranmission by valve body
parts# 29542692
Once again truck turned on like nothing no check engine light, second after crank same problem check engine came on gear selector changed from P to E turned truck off and wouldnt crank again this time after a couple of tries the gear selector wont even show up E is completly blank.

-Tempeture sensor control module was replaced inside the transmission
parts# 29546972
same thing truck turned on seconds after check engine came back and E on dashboard.

-TCC solenoid replaced , Pressure control solenoid trim A,B , and SS1 soloneid
parts # 29541898 , 29541896 ,29541895 , 29536833
this is the pdf that shows the solenoids names and locations: 'EDIT' forum wont let me post the link

finally i took the Tcm out and took it to a place to get it 'tested' and was told lost comunication that the tcm was bad,
ordered a used TCM from a salvaged truck with same P/N assembly number etc installed it and the same problem continues, Gear selector on display is on Blank and truck wont even try to crank. tried looking for a electrical diagram to check the harnesses with voltmeter but no luck finding them or the correct volt n omh
All eletrical conections where cleaned with contact cleaner, oil replaced twice, and some basic fuse check not relays as i cant find if the transmission even has one in this truck thanks for your time for reading this post i completly ran out of ideas and my wallet is destroyed ill appreciate any suggestions or leads
 

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greasytshirt

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Generally when E shows up on the shifter, the TCM has failed. They have a high failure rate. I can look at this a little deeper but until a known good TCM with the correct programming is installed, all bets are off.
 

greasytshirt

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I guess you know by now, but no one should ever shotgun parts at one of these things. Get an actual diagnosis first.
 

greasytshirt

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The replacement TCM might be good, but they use that computer on all the different Allison transmissions of that era, so there's no telling what programming is on it.
 

chromepixels007

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Owner/Operator
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sorry about the late response and youre totally correct about that but i was pretty much forced to or pay a 1700 tow lol, im planning on taking the used TCM to hino and ask some questions about how the reprograming works.
the TCM i order has the same Assembly # and Customer P/N number it should have the same programming i will upload some pictures when i get to work on the truck this weekend ill update thanks!
 

greasytshirt

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Mechanic
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Hino won't be able to do anything with the TCM, you need to go to an Allison dealer.
 

greasytshirt

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Update: water can get into the firewall junction box from a leaking windshield seal. If it gets into the CAN wiring, all sorts of weird things happen. The junction box needs to be opened up and inspected for water.
 
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