Car continues to run after key removed

[Guest]

Welcome, Guest. Please login or register.
Did you miss your activation email?

1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[FalconEddy]

Another update on my run on issue. It again happened last Friday so I brought it back to the dealer of course it did not do it when I first got there. But, I kept turning on and shutting off the car and it did it !!! Then they tried and it kept doing it. They checked it out and called to say they think they found the problem. They said it was the SDM Module - this is an $800.00 fix. This  module is for the air bag system (they claim the voltage from this module was backfeeding the computer) at this point I have no choice but to replace it because otherwise the dealership doesn't find any other problem. Will let you know what happens, won't be ready til after Tuesday.  

Well, hopefully the new SDM Module won't also backfeed the 5985 circuit, or you'll still have the same issue.

If the SDM Module was faulty, it should have thrown a code.

As you can see, I don't trust most service departments with unknown issues they have to troubleshoot on their own. I'd be getting involved first, and taking readings and measurements in the shop right along side the techs in a supervisory role. I trust me, and if the old SDM Module could have had a diode soldered in between it and circuit 5985 to prevent a measly 5V from hitting it, that's what I would have done; and saved myself $798.50 in the process.

However, with that said, hopefully the repair will work out for you.

. . Falcon

[kidsenclave]

Another update on my run on issue. It again happened last Friday so I brought it back to the dealer of course it did not do it when I first got there. But, I kept turning on and shutting off the car and it did it !!! Then they tried and it kept doing it. They checked it out and called to say they think they found the problem. They said it was the SDM Module - this is an $800.00 fix. This  module is for the air bag system (they claim the voltage from this module was backfeeding the computer) at this point I have no choice but to replace it because otherwise the dealership doesn't find any other problem. Will let you know what happens, won't be ready til after Tuesday. 

Stupid computers.  I don't think vehicles are getting better, seems to me I have not heard of this issue since the 70's and 80's where a vehicle might run on for a few seconds because of bad tuning, timing, or whatever the reason.  But for a vehicle to keep running because of an $800 computer part failure, that's hard to swallow.

[scuba007]

Curious as to what the symptoms were for this?

was just reading thru thread and saw your question. The symptoms i had is while driviving you could just feel that it was not shifting at appropriate speed changes. And the RPM kept staying at around 2 or 3 I beleive. When the car did shift the RPMS remained the same instead of dropping down. I hope I am explaining it right.

[Buick Customer Service]

Another update on my run on issue. It again happened last Friday so I brought it back to the dealer of course it did not do it when I first got there. But, I kept turning on and shutting off the car and it did it !!! Then they tried and it kept doing it. They checked it out and called to say they think they found the problem. They said it was the SDM Module - this is an $800.00 fix. This  module is for the air bag system (they claim the voltage from this module was backfeeding the computer) at this point I have no choice but to replace it because otherwise the dealership doesn't find any other problem. Will let you know what happens, won't be ready til after Tuesday. 

scuba007
Thank you for the update. I am happy to hear that your dealer was able to identify the problem for you. Please continue to keep me posted. If you would like my assistance or have any questions please feel free to contact me anytime.
Thank you,
Stacy GM Customer Service