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2010 Impala - Stalling at 50-60mph - Help!
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djrobnyc
New User
Aug 30, 2012, 12:49 PM
Post #1 of 2
(2019 views)
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2010 Impala - Stalling at 50-60mph - Help!
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I'm looking for some help in diagnosing an intermittent (but potentially dangerous) problem that I've had with my 2010 Impala that has about 40,000 miles and the 3.5L engine (it's an LT).
About two months ago as I was driving on a local highway -- about 55-60 -- I felt a slight hitch and the Service Stabilitrak lamp/message lit up. I continued to drive another mile or so at this speed - and then the Starting Disabled Service Throttle and Engine Power Reduced messages came on, as well as the Service Engine Soon lamp. The car slowly shut off -- but I made it to the side of the road. The car would not restart for 2 minutes - I was then able to restart it and it drove okay, but I pulled over to a safer part of the road, called GM and they had the car towed to the dealer where I purchased it from.
The shop told me the car spit out a Throttle Body code and that part was replaced. They kept the car for two days to test it and the problem seemed to have gone away.
Unfortunately, that was not the case. This same thing happened the other day. Everything happened exactly the same. However, this time - after I got the car started after 2-3 minutes -- I drove it to work, which was a few miles away. At the end of my work day, the car started up fine and the Service Engine Soon lamp was NOT lit. I drove the car back to my dealer - and they have it now.
This time, they tell me the car spit out a Low Voltage code - which they traced to the battery. They tested the battery, it failed that test so they've replaced it. Again, they have kept the car for two days for further testing - and called GM to tell them about the problem. I questioned the shop as to whether this was really the problem part (the battery);they seem to think it is.
While I appreciate the effort by the dealer - I do feel they are really trying to find out what's wrong - I'm a bit skeptical.
Can anyone out there help? It's not fun to try and have to navigate getting to the shoulder of a highway while going 60 mph to 0. And my wife won't get near the car now...
The only other piece of evidence I can offer is that both times this happened there was less than a quarter tank of gas in the car.
By the way, I've read on some other sites of people having this same issue - one person even said her throttle body was replaced, didn't fix the problem (same as happened to me), but when she brought it back, the mechanic replaced the accelerator pedal assembly sensors/accelerator pedal position sensor.
I asked the dealer mechanic about this and I believe he said those sensors are part of the throttle body - and were therefore replaced last time.
Again, thanks for your help!
--Rob
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Discretesignals
Ultimate Carjunky
/ Moderator
Aug 30, 2012, 1:30 PM
Post #2 of 2
(2002 views)
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Re: 2010 Impala - Stalling at 50-60mph - Help!
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We really can't do anything on our end. Intermittent ETAC problems are very difficult to diagnose. I got an Infinity M35 in the shop right now that spit out a pedal code and I have yet to be able to duplicate or catch it on the scope.
Intermittent problems are usually caused from wiring problems and electrical connections. If they are using a scan tool to diagnose this, they might as well try to catch flies with chop sticks. Scan tool doesn't have the sample rate to catch glitching.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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