2008 KW T660 won't shut off

Hi everyone. Today its 09/09/2022.

I need help trouble shooting help
My 2009 KW T-660 . I Just had a new Speed sensor replaced by a KW Shop yesterday. Once I got home and turned off the ignition. The engine kept trying to restart and NOT Shut Off. Anyone know what could cause this ??

 

Husband just drove it back to the shop. Waiting to see what they find. They said it could ignition or a software problem. It is in near new condition. Owner we bought it from was obsessive in its upkeep. Has an APU unit, all sorts of engine and gauge monitors. Excellent 2009 KW T660. Husband has continued to follow all exact care plan. We have reciepts over 1000. The owner gave us since day 1 of his purchase date. This is first uncommon problem.

 

Yes.

 

Yesterday after they put the new sensor in. The diagnositic said no problems detected. Idk

 

This morning I got up at 5am to get kids ready for school. Suddenly the truck started running. It wasn't truck.
It was APU Unit turned on. I freaked woke up hubby. It shut off by time he got dressed. He questioned if I was dreaming. Lol. 30 minutes later as we drank coffee. It started up again. He flipped out. Ran out and said... Its the APU. Then he remembered his brother in law was checking out the road master. He had accidentally set the auto start timer on the APU ! So now I was wondering if that has anything to do with it. Hubby says no their totally separately controlled.

 

Result from Best One truck center.
Turns out the ECM, Was not working.
Looking at $3000.00 to replace the entire electronic Brain or called motherboard.