jamesT

New to this forum - I need help starting my 2005 Corvette. The FOB works with windows, doors, etc. And the accessories work with ignition, but the car doesn't start. Trying to avoid having to tow it to the shop. I changed the battery recently and it reads 12volts.
Any ideas?
Thanks, James

Hoonose

Check the battery ground for tightness and corrosion.

RicK T

Is it turning over with the starter but just not catching? Or is the starter dead?

jamesT

not turning over at all

RicK T

Well, the battery is the first suspect in no start cases. I know you said it's recently replaced and measures 12 volts but.......do you have any way to test it or take it out and take it someplace to test it under load? Or just replace it? Sounds like there is enough power for the little electrics but not enough to start which is fairly common.

How long since the car was driven? Does it sit for long periods without driving or starting? Do you use a battery maintainer?

jamesT

Well I got it started - required a jump. Not sure why since I drove it the day before it wouldn't start. There wasn't anything in the cab that would have pulled from the battery. This is the second battery I had to get, the first one wouldn't hold a charge either. I guess maybe the electrical system should be looked at.
I did notice that I could move my negative cable on the battery post by hand with the bolt tightened all the way.

Bill Curlee

That battery cable/clamp SHOULD NOT move by hand in any way shape or form! Thats part of your issue.

VET4LES

In addition if you have the manual transmission you should find out is it's had the flash and if not get one. Your dealer can tell if your C6 has had it.

cobiaking12

for my 2005 C6, 6-speed. I'm having the same no start issue after sitting for a few days, but with a twist.

I had the same problem after letting the car sit for 1 week+. I started researching and saw a previous post from years back that said to pull the battery cable off for several minutes and then reattach. I did and it fired up like new. In fact, I'm employed that fix multiple times. That indicates to me that it isn't necessarily the battery. Especially since it is under a year old. I wen't and bought a battery tender anyway, thinking it might avoid this situation, but as I tried this morining, no start. I didn't pull the cable off and try for lack of time, but I'm getting tired of it at this point.

Made an appointment at the dealer to get the reflash mentioned and get a thorough check up. Keep a ratchet and socket handy, as that might get you by until a solid fix comes up. Can't hurt to try.

gunterwalker

I would get a new battery. I don't care what the meter says battery issues on these cars cause more issues than you can imagine. I think its well worth buying a new battery to test the theory.

1fastbob

Check the connection where the positive battery cable goes to the starter solenoid. It may be loose enough to prevent it starting but tight enough for the FOBs and such to work.

Bob

cobiaking12

When I got home last night I took the negative battery cable off for 5 minutes and reattached. The car fired up immediately. After doing this multiple times over the past several months with success, I keep coming back to the thought that something with the computer/electronics needs to "reset". Dropping all power and then reconnecting seems to accomplish that. If history repeats, I won't have another starting issue until I let the car set for several days without starting.

I'll check the positive connections on both ends!

Thanks.

csnow

It is your steering column lock going out. When you cant start it, check to see if the steering column is locked. When you remove the battery cable, you are resetting the BCM.

Read through this thread.....

http://forums.corvetteforum.com/c6-c...ont-start.html

cobiaking12

I haven't paid any attention to whether the steering column was locked or not, so I'll have to check that out. Might just replace the switch for good measure.

I haven't had a single start problem since the original post, but I've made sure I've driven or started the car at least once every 3 days, max. If it's something as simple as replacing a switch, my mind will be much better off. A car that strands me is a car I don't want in my garage.

Thanks, again, for the thread!

dgrant3830

I've got the battery cable tightness issue on my '07 as well. The positive cable clamp is tightened all the way, but it can still be moved. I've already purchased a new battery cable assembly from Gene Culley but have not installed it yet. It really appears that GM's design of this part is very questionable.

Twayneo1

did you find out what the issue was? I'm having the same issues as you but i have a column lock eliminator and i just installed a new starter today

Thebuju

I had the same issues. Starter, Alt, Battery, Underhood fuses/relays etc all good. Turns out it WAS THE LINKAGE IN THE TRANSMISSION DISCONNECTED. Not sure how it happened, but fixed it. Solved the problem and running fine.

Bill Curlee

Many times the fault with the battery cable terminals is the way people reassemble the bolt that does the clamping. the actual bolt doesnt clamp. The ferrel makes the clamp tighten. There is a small tapered ferrel that needs to be installed properly to make the cable clamp properly.

Make sure that the tapered ferrel is installed properly.

Bill

Bill Curlee

I had an 06 Coupe MN6 C6.. When I pressed the START button, the entire IPC goes BANK except for the small LOCK Symbol and nothing else happens. My START button had the infamous CRACK and many people stated that the crack made the start switch go bad. SO, I changed the START Button. NO CHANGE, Still wouldn't crank and the IPC still went blank.

I got mad and pressed the START/STOP switch repeatedly 20-30 times and she cranked. Still puzzled and I know that I didn't solve the issue.

One day it stranded me and I ended up disconnecting the Negative cable for a few minutes and that solved that issue for a few days.

What this issue is telling you is; The BCM is going bad and you need to change it. The BCM on a C6 is the Instrument Panel Fuse Box. Took it to the dealer and had them install a new fuse box/BCM and that solved the issue for good.

There are other issues that can cause the C6 not to start. If you want to solve the issue WITHOUT breaking the bank easter egging in expensive parts, you need to break out the schematics and a Multimeter and do some troubleshooting.

Here are the schematics that you need:

This one has the START push button and the circuit that goes to the crank relay.






The key troubleshooting point (for me) is the CRANK RELAY!! From there you can determine if you have the low current relay control voltage and or the high current starter solenoid voltage (purple wire) when all conditions are in place to crank the engine:

There are TWO triangles on the starter circuit schematic. One with "A" and one with a "B" Those triangles can be matched up with the same triangles on the other schematic and that will allow you to see how both schematics interface and what controls the relay.

If you follow Triangle "A" it goes to a portion of the starter safety circuit and you can use the MN6 Clutch switch or the Automatic Neutral Safety Switch.

Triangle "B" is ground return for the relay..

If you ever need HELP following this circuit and using a multimeter to pin point a NO CRANK issue, just let me know. I rather enjoy it as I have a LOT of expierence with it...

jimmy murcier

Took cable off 20 seconds and reattach and it stated tight up.