I bought a 2007 Base with a manual trans a while ago and one day we hit the stop button and all gauges went to zero, but the motor kept idling.
The only way to kill it totally was to hit the button repeatedly or the instant way was to open either door.
I ordered a new button.
Before it arrived, the car was perfect again.
I installed the new button since the original was cracked anyway.
Worked great for a few months but now it’s back to not stopping the engine.
Should I look at wiring down at starter?

 

look at the the BCM and the ECM via tech 2 for the BCM start command, and the stop command (will be in both BCM and ECM data display).

Hence if BCM is killing the dash from the Start button stop command, but not the motor, then the problem is the ecm is not receiving the stop command from the BCM, or just ignoring it. Also, same set of can bus wires are sending the command from the BCM to the ECM to start the car, so may be a problem with the ECM alone.

 

Thanx very much.
Looks like a spendy trip to the dealership.

 

So always trying to learn. What software do you use to look at the data stream? I have a TechII but it does not have that capability (at least from what I know).

 

Tech ii, go into BCM data, then ECM data, then look at the run command. With car off, it should state off. Now hit the start button, and will see that the run command change to start, then run, and when you turn the car off, again, command should turn to off again for both the BCM and the ECM. So we start in the BCM data first to make sure that BCM is doing what is suposed to do via the starter button, then we go into ECM Data to make sure that the ECM is following the same.

So in his case, the run command is working in both since the car will start, but when he goes to turn the car off, ECM is not either getting or following the command isntead. Hence if car is still running, but ECM command line is reading stop, then ECM has a major problem. So best case, may just be a ECM/BCM corroded pins connector problem, and when the car is shut off and the BCM is doing it thing, enough of a power glitch that the ECM is just not getting the command from the BCM.

So on something like this, would first start by pulling the upper engine fuse box off the lower assembly, cleaning them up, then putting them back together. Next would be the BCM connectors to clean them and check it grounding point, then followed by the ECM connectors and grounding point as well. This weeds out the corroded pin problem and makes sure that the BCM is not low power glitching turning the car off, as well as good connection to the ECM for the same reason as well.

Aslo, does not hurt to watch the BCM and ECM voltages during both run and shut off switching, to see if you have the major power dip corroded pin/groudinng problems to start with.