I have a 08 base car. Bought it. Drove it all the way home, 450 miles. Drove it a handful of times for a few weeks, then I took it to the body shop to have it painted. Never disconnected anything, except the door harnesses to remove the doors and have thew jams and all painted. Also, while sitting there for weeks, the battery went dead. Used a jump box a few times. To start it, and used a charger as well.

The battery is good. had it checked multiple times and tested each cell as well. The car didn't want to start. Gauges and such would come on, but when you pressed the start button, it would go black and do nothing. Checked the fuses, at the kick panel and under the hood. No issues. Thought the battery was bad, but the battery guy tested it thoroughly and no issues, just needed charged. So charged it longer. Boom, then the car started.

Drove it a few times. Then one afternoon, went to start it, and the ABS, Traction control lights, and gauges stopped working as well as the A/C. Plugged in the HP Tuners to read my codes and OBD was dead as well. Went to check the fuses at the kick panel, all were good. Wiggled the blue connectors, and I heard some clicking of relays and such. Boom, everything worked and the lights went away, and my OBD works now too.

Well, now randomly the cluster will light up with all the warnings lights and all gauges except speedo and rpm will stop working. Wiggle the blue connector and clears itself up. (keep in mind I never had these issues when I first bought it). I looked at the pins and the connector, couldn't see any corrosion or issues. Sprayed with contact cleaner and used some dielectric grease on the plug. Drove the car for awhile, no issues, then when i pull up to the house, does it again. OR when i first start the car it does it, or after i drive it for 5 min it will do it. Wiggle the blue plug a few times and it works.

I inspected the plug,no issues. Nothing it pushing up against it or bumping it. And if i hit bumps or such it doesn't cause an issue. It seems very random.

Could the BCM be the issue? But a coincidence that when I wiggle the plug it clears up? Anything I should try or check? I have a spare BCM from a 2009 Z06 that I can get reporgrammed.

Also, may be totally unrelated, but I get feedback from my right rear speaker, only when the volume is turned up some, but the radio on and volume down, no issues.

Kind of a long read, but hopefully you guys can help.

 

Anything is possible, but I'm still suspicious of your battery, regardless of what the guy said. I would replace that before the BCM. Check the battery connections as well.

 

I think "torquetube" is on the right track here.

Check the battery, make sure the battery connections are tight, then check the "blue" connectors. For problems like this I usually clean the connections, put some dielectric grease on the connection seals, then zip tie (by going between the wires) the connections together. YMMV

 

Using a jump box or jump starting is a real bad. never try to bring back an old dead battery. its stresses the hell out of the already delicate systems in these cars. low voltage fries modules and grounds. they dont like it.

 

The battery is likely toast, if it was jumped from dead. I would suspect one or 2 of the cells are shorted. it's only a matter of time. Might as well get a new battery and be done with it.
As far as the Blue connectors go under the passenger floor board, remove them, put dielectric greaee on the pins, recoonect and make spacers so no one can push against the floorboard to disloge the connectors.
That should solve all your issues.

Good luck, and report your findings.

 

I wonder how the OP had each individual battery cell tested ? Agreed, battery is probably toast.

 

Hydrometer, I suppose.

 

When was the last time you saw a battery with caps in a Corvette ?

 

I have been dealing with the EXACT same issue for a few years on my 08 as well. When it would act up my Dashlogic would stop working as well. (Unplugging the Dashlogic did not help and the car did this before the Dashlogic was installed) I put heavy duty duct tape (gorilla tape) over the blue harness connectors to secure them. It seemed to help some. I glued erasers to the bottom of the access panel to keep the panel from closing all the way and hissing the connections as well. (it is hard to tell what worked and didn't because the problem was so random.) I haven't driven it in a couple years due to a lifter failure, and the car is currently on my lift going through a major build. But, before I started tearing the car apart, I pulled the BCM and disassembled it. Its pretty easy to tear apart. I thoroughly checked every solder point on the board with a strong magnifying glass and didn't see any problems. I removed the blue covers from the wiring harness connections to inspect them and found nothing. I cleaned all the contacts and applied dielectric grease and reinstalled it. (I really had to pull it apart because could not get my HP Tuner, Tech 2, or Dashlogic to connect via the OBDII port,so I had nothing to lose.) After the BCM was back in, I started the engine to verify function and it all connectivity was restored and all the warning lights on the dash were gone, But, the car is not drivable so that is as far as I got.

A lot of people will blame the battery, and that is certainly an easy place to start looking. I can 100% guarantee my battery was not the cause. I have been though several batteries in this 12 year old/100k miles car and it happens with new and old batteries. I have done the "Big 3" upgrade and I also run a high output Powermaster Alternator. (BOTH are great upgrades) I also have a new starter with good wiring to it as well.


You can see the old Gorilla Tape residue on it. LOL

Homemade dead peddle switch Mild to Wild kit fuses

Something I really had no desire to ever see in my life.....The BCM Board.


You have to drill the out to remove. I was able to reuse one and I used a rivnut on the other one. (did not use a rivnut tool just slipped a rivnut id by hand)

 

Yeah, good point.

 

Im going thru this rite now. Did you reuse all the relays? Or replace.

 

I reused everything.

 

yep, I ended up reusing everything. Came out great. Car runs perfect. I had to clean my PLx boost and wide band boxes out also. Even uploaded a tune, I tuned my own car as well. I was about to let GEICO take the car. Last second this post helped change my mind. nice write up. I made a little vid.