desperate in north dakota
Thread Starter
2nd Gear
Joined: Feb 2016
Posts: 2
Likes: 0
desperate in north dakota
my 98 C5 6spd has serious electrical problems. I have spoke with every willing to listen and studied on line followed every lead and thought and still nothing. Was in a chevy dealership, shop They had no clue. Here`s the fun part. engine ran fine, at a stop light one day it stalled. Would just fire and not run, tried several times. had it towed to dealership. 6hrs later said bad BCM maybe. I trailered it home. It will not read codes off dash or scanner, every ground on car is perfect, new battery, all relays all fuses perfect. it will run time to time. display reads reduced eng power, check gauges, low fuel , low oil pressure, serv engine soon,, and the windows and door lock do not work. ABS, traction control, check engine light are all on, tach works when it does run, amp gauge works. fuel and oil , temp gauge is inop. security light goes off like it should. help ?
Melting Slicks
Joined: Jul 2010
Posts: 2,503
Likes: 33
From: McGrady NC
St. Jude Donor '15-'16
Pull the BCM out and check it for evidence of water damage. Bill Curlee had a post about it some time ago. Look in the sticky thread at the top of the C5 Tech section about electrical problems and search for BCM. I'm not sure about finding a replacement easily but Marc at Vettenuts (forum supporting vendor) may have one. I bought one for my 2002 Z06 online from one of the major parts suppliers for less than $100. A replacement will have to be programmed by someone with a Tech II to enable all the options on your particular car.
Drifting
Joined: Feb 2008
Posts: 1,596
Likes: 67
From: Bahama North Carolina
Check this post. It sounds to me like you may have a short in the serial data bus.
https://www.corvetteforum.com/forums...-there-is.html
https://www.corvetteforum.com/forums...-there-is.html
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
Start with the serial data buss star connector. It cheep and easy. Only disconnect the connector with FOUR wires.. If you disconnect the other connector, you will lose ALL comms and the car will not run. 
The second place to check is the IGNITION SWITCH. Before you get to wrapped around the wheel, I would turn the ignition switch to ON and check the Hot in ON and START powered fuses at the BCM and PCM to make sure that they are getting FULL battery voltage. That power comes directly from the Ignition Switch.
If the contacts are damaged/burnt. you could be seeing very low voltages on those fuses.
THUS the Stealer Ship would have said that the BCM isn't working!
NOTE! Each FUSE has two little TEST SLOTS on top of the fuse. With the IGNITION ON, Measure each slot to a good chassis ground and look for FULL BATTERY voltage at each test slot.
Supporting Vendor
Joined: May 2010
Posts: 6,819
Likes: 235
From: Bell Buckle, TN
St. Jude Donor '11
We have a 98 BCM in stock located here: http://www.vettenuts.net/index.php?l...t_detail&p=830
If you have any questions feel free to call me at 615-896-6100.
If you have any questions feel free to call me at 615-896-6100.
