X Contact Dealer woes and BCM removal instructions needed
This is a long story, so I appologize, but I hope it helps others
Since about August my wifes 2009 G8 GT has been having intermittent issues, the X Contact dealer appears first, shortly followed by abs, traction control, air bar, etc. failures in the info display, check engine light comes on, speedo wacks out, gas gauge goes to zero, and the car goes into limp mode. On occasion, if turning ignition of when this happens, car will not restart. If the car sits for a bit, everythings gone and its back to normal, till the next few miles you drive it then the cycle usually starts again. It only did every few times the car was driven at first, but as of last month, it was doing it every time.
I have and icarscan, so I have been scanning and keeping track of the codes, I will get 10 or more at a time, usually centering around "lost communication" for all the control modules, plus some others.
Ive gone to the dealer 3 times. Yes I know, I should have tackled this job myself, and I am kicking myself for it now. I have read some of the discussions on this topic, checked the comm wake fuse and relays under the hood, and started checking wheel sensor connectors and some of the module harness connectors I could get to under the hood. Nothing worked, and this is my wifes car which she needs all the time for our 2 todlers, and its was 0-10 degrees in Ohio at the time, so I took it in.
First visit to the steeler said they couldnt find anything, checked a few things, read all the same codes I was getting, but it wasnt acting up at the time, and that this might go on for weeks to find the problem, so how much do you want to spend they ask? they were clueless, I even asked to get GM tech help, and they said the car is too old, usually only send a tech to help if within 5 years. I left and continued to monitor codes to see if I could narrow it down to something.
Went back a 2nd time since getting no better, they found a loose ground, seem ok, but after getting it back and driving, same problems. They suggested on next visit maybe reprogramming the BCM.
3rd visit, the said the BCM was continuing to reboot, connections ok, checked some other grounds but a TSB led them to test the BCM and determined it was a bad relay in the BCM (are there relays int he BCM???). I offered to supply a new ACdelco BCM for hal the cost of theirs, but they refused, so I shelled out $800 for this job (parts and labor). However, problem returned the next day.
I check codes, same codes as before.
4th visit, they found another TSB (even after I told them to exhaust all TSB's the previous time, ones that dont involve replacing anything), that suggested inspecting all harness connectors to modules (engine, trans) grounds at the block, etc. and clean add dielectric grease, and this seems to have solved the problems, several days now without issue. but another $400 later.
So Im pissed they didnt try this first, and feel I paid for a BCM that wasnt trully bad. Contacted GM customer service, but they did nothing, acted as a middle man telling me only what the dealer was doing repair wise. Dealer would not budge, said they tested BCM and it was bad, so it had to be replaced in addition to fixing/cleaning the harness connections.
So, I have the original BCM, and want to swap it back in to see if harness cleaning was the real culprit, then go back to the dealer and call them out and what I feel is a misdiagnosis.
Does anyone have R&R procedure for the BCM, Im pretty good with cars. Seeing as the labor was like $400 when they replaced the BCM, im thinking it might take some work to get it out, but then again, its the steeler.
My other thought has been to send the BCM to one of the several repair places online, to have them check it and see if it is indeed bad.
And please, if you have similar issues to mine, check and clean all the major harness and grounds first!!!
And dont go to the steeler.
Cars - 2009 Pontiac G8 GT
2005, 1988, 1969 Corvette Coupes - SOLD 2005
1992 Mitsubishi 3000GT VR-4
2005 Porsche Cayenne Turbo
Bikes - 2002 BMW R1100S