Allison error code 23-12

[TD257]

Just had to replace the ECU, and now it is showing the code 2-3 1-2 , any ideas what would have caused this.

Thanks in advance

[RJay]

You don't say what transmission you have but here is what I found for the 3000MH

Check:
a. ECU connectors are tight, clean, and undamaged.
b. Shift selector connector is tight, clean, and
undamaged.
c. Wiring harness has no opens, shorts between
wires, or shorts to ground.

d. Shift selector(s) for proper operation.

[94-Newmar]

Get in contact with John here Transmission Instruments He is an ex-Allison engineer and can troubleshoot/fix/repair just about any issue with the Allison ECU's and Control pads. He knows the Allison electronics like the back of his hand. He repaired our WTEC-II controller for a 3060 Allison for $300.00 when Allison wanted $2k to just replace everything.

[RV Trax]

94-Newmar. Thank you for the contact. We have had a few control issues in the last few years, which have been very costly. The next time we will give him a try. It will save our customers alot of money. Thanks again.