Would it be called surging?
Joined: 05-22-2008
Posts: 3
From: Houston, TX
Glad this helped you guys....
I had mine back to the dealer to replace an antenna and base and had him reset the tap cells. Mine had taken about 15K miles to re-corrupt. He told me that a manual "hard reset" could be accomplished by removing both battery cables, waiting 20 minutes, touch the (disconnected from the battery of course) cables together to finish bleeding off any capacatance stored electricity and that should kill of any adaptive strategy and return to programmed pressures. The conventional wisdom is that since this platform is being discontinued that there would NOT likely be a GM rewrite/reflash made avaailable.
I had mine back to the dealer to replace an antenna and base and had him reset the tap cells. Mine had taken about 15K miles to re-corrupt. He told me that a manual "hard reset" could be accomplished by removing both battery cables, waiting 20 minutes, touch the (disconnected from the battery of course) cables together to finish bleeding off any capacatance stored electricity and that should kill of any adaptive strategy and return to programmed pressures. The conventional wisdom is that since this platform is being discontinued that there would NOT likely be a GM rewrite/reflash made avaailable.
Thread Starter
Senior Member
Joined: 10-16-2009
Posts: 112
From: TEXAS
I've had my radio, antenna and base replaced. It must have been the base (and its small pre-amplifier), as I can now get stations more than 10 miles away.
Oh, and the surging seems to be starting up again. Sigh.
Oh, and the surging seems to be starting up again. Sigh.
Thread Starter
Senior Member
Joined: 10-16-2009
Posts: 112
From: TEXAS
The dealer who fixed the problem did not document it. So, now that I live in another area, I had to explain the returning problem to another dealership. This service writer did a 'yeah, yeah, we'll figure it out' instead of listening to how it was fixed last time. 
Thread Starter
Senior Member
Joined: 10-16-2009
Posts: 112
From: TEXAS
No, they were a little lax on writing things up. (I don't know how they got reimbursed by GM.)
I wound up taking it back to the original dealersip, and the service manager remembered my problem. He said, 'Ya, you drive it like an old lady. I have another customer who works at getting high mileage, and he has the same problem.' He re-flashed the TAP for the PCM, and it works great again.
I wound up taking it back to the original dealersip, and the service manager remembered my problem. He said, 'Ya, you drive it like an old lady. I have another customer who works at getting high mileage, and he has the same problem.' He re-flashed the TAP for the PCM, and it works great again.
Joined: 04-08-2009
Posts: 1
From: Zachary, LA
New guy here and only because my Mom & Dad own a 2008 HHR (Silverado guy myself). Same issue w/ the surging at low speeds. I tried a battery reset today but it didn't cut it. I'll try to take it to the dealer later this week for the TAP cell reset as was suggested on page 5. Has anyone contacted GM (lack of) Customer Service about this?
