Crazy BCM/ECM problem?
Thread Starter
Instructor
Joined: Apr 2009
Posts: 100
Likes: 0
From: Lynchburg VA
Crazy BCM/ECM problem?
I posted this in the general a few months ago and now I'm going to try and give an update/new post about what's going on.
Car has a custom (done by me) twin turbo setup (has a BAP). Always ran great but one day I was driving and the car just shut off coming to a light. It said Service ABS, then Reduce Engine Power then Service Fuel System, then service column lock.. etc. I pulled over and shut the car fully down. I hit the button, and nothing happened... I tried again, and it cranked for 10 seconds and quit.
After that, if I hit accessory, everything's normal. If I hit the start button (clutch or no clutch), the car flashes the radio, but is blank for 10-15 seconds and then sweeps the gauges (car never tries to start again). It usually just says Service Fuel SYstem but sometimes randomly says Service Column and ABS.
I got a new BCM with no change, cleaned all 12 grounds and secured them.. checked all relays/fuses, even checked the pins they connect to, no damage..
I can't find any wire that is burnt on the whole car. I am really lost. I tried 2 new batteries, and even redone all the wiring to the batteries with no change.
Any insight?? I am going CRAZY!
EDIT: also, I cannot connect to the ECM via hptuners. but the ECM has tested good!
Car has a custom (done by me) twin turbo setup (has a BAP). Always ran great but one day I was driving and the car just shut off coming to a light. It said Service ABS, then Reduce Engine Power then Service Fuel System, then service column lock.. etc. I pulled over and shut the car fully down. I hit the button, and nothing happened... I tried again, and it cranked for 10 seconds and quit.
After that, if I hit accessory, everything's normal. If I hit the start button (clutch or no clutch), the car flashes the radio, but is blank for 10-15 seconds and then sweeps the gauges (car never tries to start again). It usually just says Service Fuel SYstem but sometimes randomly says Service Column and ABS.
I got a new BCM with no change, cleaned all 12 grounds and secured them.. checked all relays/fuses, even checked the pins they connect to, no damage..
I can't find any wire that is burnt on the whole car. I am really lost. I tried 2 new batteries, and even redone all the wiring to the batteries with no change.
Any insight?? I am going CRAZY!
EDIT: also, I cannot connect to the ECM via hptuners. but the ECM has tested good!
Last edited by cvccbum; May 23, 2011 at 06:05 PM.
Team Owner
Joined: Sep 2005
Posts: 20,352
Likes: 568
From: Ventura County, Calif
Wow, I have nothing to offer but sympathy. Sorry for your troubles. I'll be watching this with interest. You might want to also post in the Forced Induction Forum and maybe even the Z06 Forum to get the most eyes on this. Best of luck. 
Thread Starter
Instructor
Joined: Apr 2009
Posts: 100
Likes: 0
From: Lynchburg VA
Burning Brakes
Joined: Jul 2008
Posts: 923
Likes: 37
From: Green Bay Wisconsin
Hello,
Maybe your alternator is funky, voltage spikes and sags will cause havoc with any computer.
If I were you I would buy another alternator and install it, you could have your alternator load tested but the problem may only manifest itself when under a hot hood for example.
Douglas in Green Bay
Maybe your alternator is funky, voltage spikes and sags will cause havoc with any computer.
If I were you I would buy another alternator and install it, you could have your alternator load tested but the problem may only manifest itself when under a hot hood for example.
Douglas in Green Bay
Thread Starter
Instructor
Joined: Apr 2009
Posts: 100
Likes: 0
From: Lynchburg VA
I may look into an alternator after the vehicle will start and run, but it doesn't even attempt to start so it shouldn't come into play with this issue. It's a good idea though for after, to avoid another issue like this again!
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
When I owned and had C5 NO START issues,, I thought they were BAD!
Owning a C6 makes C5 issues CHILDS PLAY!
Heres where you need to look! Good luck. If its a hard fault, you will be able to troubleshoot and find it:
Starting Circuits:
Owning a C6 makes C5 issues CHILDS PLAY!
Heres where you need to look! Good luck. If its a hard fault, you will be able to troubleshoot and find it:
Starting Circuits:
Last edited by Bill Curlee; May 24, 2011 at 01:48 AM.
