C5 Serious Issues with Loose Wires?

MADN3SS · 10-02-2010, 10:49 AM

My Z06 will be 10 years old in 11 days. It's got 65,000 miles on it.

I was driving to work and I went through an intersection with a large bump in it and all of a sudden I got major warning/malfunction lights.

On the display was "Service Traction Control", "Service Active Handling", "Security", the Airbag light, "Reduced Engine Power", the radio went off, "Low Fuel" and the gas gauge was empty when I had a 1/2 tank. I didn't actually notice reduced engine power though.

I tried to check the DIC initally but it said "No Comm."

After I got to work and shut it down I was able to check the codes. Here they are:

P1626 Theft Deterrent System Fuel Enable Circuit
U1300 Class 2 Circuit Shorted to Ground
U1301 Class 2 Circuit Shorted to Battery
C1225 RF Excessive Wheel Speed Variation
U1255 Generic Loss Communications
U1096 Loss of Communications with IPC
U1016 Loss of Communications with PCM
U1064 Loss of Communications with BCM
U1160 Loss of Communications with LDCM
U1040 Loss of Communications with TCS
U1176 Loss of Communications with RFA
U1255 Serial Data Line Malfunction

There was also a U1088, but wasn't able to find out what that was.

I drove home and there was no problems. I drove to work the following night and I had the same issue, though after hitting another hard bump intentionally, the radio came back on and some of the other warnings disappeared. Any idea where I should be looking for a loose wire/connection?

Thanks.

Shadow · 10-02-2010, 11:22 AM

Obviously an electrical problem.
Sounds like that "bump" may have caused a wire to short?

Anyway, did a little searching and found these links that may help you.

I'll bet Greg or Jesse will know if they see this

Anyway, here you go:

http://www.c6registry.com/Technical/ls205codes.htm

Quote:

U1088-Lost Communications with Sensing & Diagnostic Module (SDM), BCM-IPC"

http://forums.corvetteforum.com/c5-t...lp-please.html

Quote:

First start with the accordian and see if you can find a problem there. With all of those codes you more than likely have an electrical problem. If the voltage is pulled low enough that could trigger C1214. Otherwise, C1214 may be solved by repairing/replacing the EBCM or it may be more involved and require repair/replacement of EBCM plus replacement of the BPMV. If the BPMV motor is shorted to the case that would cause the EBCM to go bad so just repairing the relay in the EBCM and not replacing the BPMV isn't a complete fix and the problem will come back.

Bill

http://forums.corvetteforum.com/c5-t...andling-4.html

and:

http://forums.corvetteforum.com/c5-t...-thread-4.html

Hope some of that helps.

chris308 · 10-02-2010, 11:47 AM

sounds like a loose ground to me.

**Rich Z** · 10-02-2010, 12:10 PM

Yeah, it's a good idea to clean up the ground wire contacts every once in a while.

Bob K · 10-02-2010, 12:52 PM

My guess is the harness connector is loose or needs cleaning up at the PCM. There are two of them.

MADN3SS · 10-03-2010, 08:06 AM

Thanks everyone. How many grounds are there? I had heard something like 20ish. Is there a diagram of how to find them? I'll try and get at the PCM this week to check the connection there as well.

MADN3SS · 10-03-2010, 08:08 AM

Had an additional problem last night on the way to work. I lost all power to the passenger door. Couldn't roll up the window or power lock the door. The lights were off on the passenger panel. I took a sharp turn into the parking lot at work and it came back on.

Shadow · 10-03-2010, 08:47 AM

It sounds more like you've jarred one of the connectors loose, and when you make a turn or bounce significantly, it makes momentary contact.

Did you check out the 1st link I gave you?

Maybe shoot Jesse a PM.

**Rich Z** · 10-03-2010, 10:59 AM

If you don't already have a set, I would recommend that you pick up the GM maintenance manual set for your car. Well worth having.

RevXtreme 1 · 10-03-2010, 11:15 AM

Look at the main connectors on each frame rail toward the front. One on each side of the front of the motor on the frame rails. They are multi connectors that get corroded over time. You can disconnect and clean each. These are the main ones, yet there are other on the back of the cyl heads. But just as important are the contacts in the igniton switch modual. It invloves removing the ignition switch and snapping the key portion from the switch portion. These become burnt over time and when jostled will cause an intermitant open triggering the DIC codes. They can be cleaned & the unit reassembled.