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The mechanic told me today that i had an alarm system/key issue as well. Said that my car stays on when it's turned off. He also mentioned something about the ECM. He also said the install might not of effective the speedometer issue. I should of taken it to the dealership. The mechanic...

What did you do to fix the problem? Was it a grounding issue from the amp? J

i might have to take my cobalt to the dealership for the same issues. first, i might get the audio shop to re wire my amp installation to see if they did my amp install correctly.

Could this be a result from the amp and sub installation? Can I pin point this problem to the installers? Also, will this be an easy fix? I had my car sitting at the mechanics over the weekend, waiting for their diagnostics. If it is the TCM, Will it be safe to drive with out this issue...

I do not want to put the blame on the installers but after they installed a kenwood amp with kicker subs, my speedometer doesn't work. I've also noticed that it feels like I'm driving in Neutral. IT doesnt want to drive smoothly. Power steering shows up on the dashboard and my check engine...