JPerrydore

Well, I have been doing a good amount of highway driving lately and started having an issue. Whenever the car ('10 HHR SS) is right around 2k rpms it bucks or slips constantly (every couple seconds). It started as it would just happen here and there once and that's it, now it's pretty constant around that rpm. Typically between 40-60mph on the highway. Above that it's fine and below that it's fine.

So, it's going to the dealership tonight. Only 17k for miles on it and really frustrated that I'm having this issue. I'm hoping it's maybe just a sensor or something. Other than that the car drives just fine, no codes or other issues.

I rely on my car for my business and going with out it for an extended period of time is going to really be a PITA!

Wish me luck....

firemangeorge

Interesting. My 2010 SS 5 speed has started to do a similar thing. At about
2000 rpms,constant speed, it seems to shudder or stutter(almost like a slight miss) Also have no CEL's come up.It is an intermittant(sp?) thing,so it doesn't happen every time. It seems to be a little more frequent the longer distance I drive.
Do you have the Turbo upgrade?
My 1st plan of action is to check the T-map sensor O-rings. Next I will check all the wiring connections: T-map,MAF, etc.

I know you said your's is an automatic,but just wondering if maybe your's isn't the transmission and we have the same problem.

Post up if and when you find the fix. I'll do the same.

JPerrydore

I don't have the turbo upgrade. It's bone stock and I honestly don't even drive it hard.

It's definitely worse when I drive longer distances. I just drove it to the dealer and it only did it a couple times. I have a feeling they are going to not be able to recreate the issue.

Old Lar

My 06 with its 2.4 L auto, when I drive conservatively, and reach 38 mph and 2000 rpm wants to shift into lock up. The rpms drop to ~1500 rpm. If I give it any gas it down shifts, and if I let the car coast it will stay in lockup until ~34-35 mph, then down shift

sleeper

Don-
inherent problem with 08 autos.. I have to disagree, mine works properly..

pro50stude

Check out the post titled Automatic Tranmission Problems and see if anything sounds familiar. Good luck and if it is still in warrranty they should take care of it.

HipHotRod

Good luck with that.

Panels4Life

AT here & never had any issues! Shifts smoothly. Id bet its covered under warranty!

ChevyM84

i have an 08 2.4 2LT and i have a problem with mine.....it feels like it surges when it goes into a high gear.....torque converter was replace awhile back and it seemed to get better but its back now.....

JPerrydore

Turned out to be a faulty mass air flow sensor. No CEL though. But apparently that was the problem. I went for a decent drive tonight to see if it was still there and it seems just fine.

It was covered under warranty.