To paraphrase I get these symptoms: while driving. Usually right after a mild bump... the dreaded “ding ding” sound followed by security light coming on dash, gauges go wonky (speedo, fuel and rpms drop to zero) Power Steering Loss notification comes and goes, sometimes loss of power steering and also the power brakes. I've had it to the dealer and to my mechanic a couple times. They can see the fault codes occured but cannot find the problem. I've done a bit of searching and there are a lot of youtube videos that suggest its a ground problem (e.g. 2006-08 Chevy Cobalt TCM FIX! Easy! BCM Problem, Connection issue
So, I did this fix, the car runs OK briefly.
I decided to use my OBDII connector with bluetooth to the torque app on my cell phone to reset the code faults. Hooking up the connector and trying to link and the problem reoccured. But here is the interesting thing. There is a little module the size of a cell phone battery connected in to the wiring harness and taped against the harness right behind the OBDII connector. It looks like the tape is oozing with oily fluid. I think its the coming from the tape. The phone says there are two OBDII devices present! I think this little module might be one. My first thought is that its for talking to the key fob? My phone was trying to talk to it and when I forced it to forget this other device, the OBDII started working and the car stopped misbehaving.
So, my hypothesis is that this module or the connection to it, might be faulty and that this is causing my 'ding ding' symptoms. Any thoughts?
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