usctroj836

Les-10

In my earlier post I failed to explain that my friend's BCM had been dealer replaced not once but twice. Each repair lasted less than 90 days before symptoms (erratic gauges/no start) returned. That's what caused me to question / wiggle wiring to the BCM. His wife was accused of continually applying the brakes on the passenger floorboard (he drove in-throttle a lot)

DaleInColorado

So the continuing spastic gauges story. (2009 C6 Z06, 40,000 miles). Dealer just replaced the BCM. Two miles from shop, it started all over again...It's a daily or every few days driver.
BUT, it does start every time so far. Well I just jinxed that !!! Waiting to reschedule trip back to Dealership. Love those extended warranties. Being retired helps with stress. Too busy playing softball.

SivaSuryaKshatriya

Wow, sorry to hear. I had the same issue on my previous 08, I ended up selling it. But I also wasn't under warranty so I didn't look as hard as you did. Hope you find a fix!

erikszr1

ill bet this car has had a bad battery sometime in its life, not now i know its been replaced but.....the effects are not always immediate.......just like jump starting these cars. they dont like it.

stefuel

If you have a fully charged battery and you can't link up to the car via the OBD2 with a scan tool then I would say the com line has a problem. I think you said it's not storing codes. I would look for a device that is easy to probe the 5 volt reference circuit and measure it when things go funky. If that is low, start unplugging devices one at a time until the voltage pops back up. Sounds like a fun one. Wish you were closer.

bobandc

My 2007 had many if not all of the problems your car has, plus mine would run really rough at times. Replaced the BCM and the battery and problems continued. Mechanic says it's a bad cable to the Mass Air Sensor, replaced it for $150 and it's been 16 months without problems.

DaleInColorado

So only once during the past 2 weeks did the tech get the car to fail, i.e. go spastic with the gauges. It lasted 3 minutes so not enough time to run good diagnostics. When I previously said no codes were stored, I meant like my 2004 did. I could pull them up through the DIC. Now it takes computers at the dealership. He is "feeling" that the twisted pair of com wires are getting interfered with from some place or with each other. The dealership gave me a loaner ( 2019 SUV ) until my car gets fixed. I tried to talk the tech into loaning me his 2017 Z07 ( the LT4 race package from the factory - no mods ). He's a nice guy but not that nice. His motto "if man built it then man can fix it". I like his attitude and have faith in his 30 years of knowledge/experience. Someday, I will be able to post the fix. OH, just jinxed myself again...

BigBoo

This mifht sound stupid but, I have been having problems with 2011 GS pnly showing s"service traction control" and "reduced power". I replaced my battery with one from Interstate, but got it again today. Thought it mifht be temp related because it happened previously on cold mornings, but today was 64 degrees. Waht I'm wondering is, what is EBCM & CBM. Looks like my next step to check.

DaleInColorado

Well after 55 days at the dealership, it looks like the spastic gauge problem is fixed. Although, I will need another 2 months to build up my confidence.
This time ( the BCM was replaced 57 days ago ) the PCM ( aka ECM ) was replaced - it didn't fix the problem either!. At day 50, I go to dealership to "visit" my Z. The tech looked at me with this S#$T eating grin. " I found it" by pure dumb *** luck.
He noticed a wire barely sticking out of the On-Star connector.He pushed it in and problem fixed. I hope.
THEN, the ABS indicator turns on and off. GREAT, fix it under warranty while still in the shop.
New part ( BPMV ) is installed only to have it leak. Why Not !! New one came in and it didn't leak. I just finished bringing it back home. No problems in 7 miles - it's a start.

Total cost $ 2300, my cost $100. Very good GM extended warranty. I paid $4200 for warranty.
I am still reading forum posts from Jan 2009 forward. A plethora of info. I really enjoy learning about my car. Much more info than the owners manual.
Take care and thanks again to those who posted helpful suggestions.
Dale

DaleInColorado

I meant to say that Scott the Vette tech and Michael the service adviser at Henry Brown Chevrolet here in Casa Grande AZ were great.

DaleInColorado

BCM is the Body Control Module and PCM = Powertrain Control Module aka ECM.

dmaxx3500

bad drivers door latch/switch?