Help Finding a Short - Dash Reset and RFA
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Joined: Mar 2013
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Help Finding a Short - Dash Reset and RFA
So I have been struggling with an intermittent short (I think) that occurs randomly. When this occurs, the dash gauges all reset as if the car was just turned on (but I will still be driving down the road) and the car will buck. The car also surges and bucks at low rpm or just idling. I have two different ideas that I think are the culprit but I can't quite nail down which one it is.
1. It sat outside while I was traveling for work for 3 months, and lots of moisture in the car. The carpet on the passenger side was pretty wet.
2. I've installed long tube headers and I cooked the wires on the passenger side that go to the ground, starter, O2, CPS. I have repaired these once with solder and heat wrap. I still had the issue, so I cut that out and repaired with crimps and heat shrink.
The car has intake, headers, and a tune as far as engine mods go. I do have HP tuners, but I really only use it for data logs and diagnostics.
Below are of some of the observations that I have noticed when it is acting up.
1. It sat outside while I was traveling for work for 3 months, and lots of moisture in the car. The carpet on the passenger side was pretty wet.
2. I've installed long tube headers and I cooked the wires on the passenger side that go to the ground, starter, O2, CPS. I have repaired these once with solder and heat wrap. I still had the issue, so I cut that out and repaired with crimps and heat shrink.
The car has intake, headers, and a tune as far as engine mods go. I do have HP tuners, but I really only use it for data logs and diagnostics.
Below are of some of the observations that I have noticed when it is acting up.
- Key fob does not work (RFA - no comm.)
- Voltage drops to 10.2V when surges
- Dash gauges all cycle to zero as if it is going through startup
- Memory in dash screen is reset
- Bucking
- P0135 H C
- P0155 C
- U1176 H
- U1064 H
- B2265 H
- U1000 H
- U1255 H
- U1096 H
Last edited by jwh172; Jan 26, 2024 at 09:07 AM.
Drifting
Joined: Sep 2009
Posts: 1,862
Likes: 594
From: Prescott, Arizona
I checked three C5 code sites, did not find P1035 or P1055. Probably should re check them.
https://www.corvettesalvage.com/c5-c...-descriptions/
The symptoms you experience could be caused by a number of malfunctioning parts including the ignition switch which is a common problem. Need accurate codes-
https://www.corvettesalvage.com/c5-c...-descriptions/
The symptoms you experience could be caused by a number of malfunctioning parts including the ignition switch which is a common problem. Need accurate codes-
Thread Starter
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Joined: Mar 2013
Posts: 53
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Sorry those two codes were a typo. I've fixed them now. However I think this is a wiring ground/short issue.
I haven't had any ignition/starting issues at all throughout this adventure. My initial thought is something is shorting out somewhere but I have no idea where to look first.
I haven't had any ignition/starting issues at all throughout this adventure. My initial thought is something is shorting out somewhere but I have no idea where to look first.
Drifting
Joined: Mar 2018
Posts: 1,365
Likes: 414
From: New Jersey
Sorry those two codes were a typo. I've fixed them now. However I think this is a wiring ground/short issue.
I haven't had any ignition/starting issues at all throughout this adventure. My initial thought is something is shorting out somewhere but I have no idea where to look first.
I haven't had any ignition/starting issues at all throughout this adventure. My initial thought is something is shorting out somewhere but I have no idea where to look first.
Pro
Joined: Dec 2014
Posts: 682
Likes: 275
From: Cincinnati Ohio
Seems easier to pull the cover over the BCM first and check for water intrusion as already suggested. There are many threads about wet passenger carpet and electrical problems due to wet BCM’s.
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Thread Starter
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Joined: Mar 2013
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Well, I think I found the issue. It was a corroded ground behind the passenger.
I looked at the ground at first and it appeared to be clean, but I took it off and it was covered in oxidation on the bottom of it. Feeling pretty dumb now since that is literally every electrical post on this site.
Thanks for all the advice fellas. I know a lot more about my electrical/ignition system after this weekend.
I looked at the ground at first and it appeared to be clean, but I took it off and it was covered in oxidation on the bottom of it. Feeling pretty dumb now since that is literally every electrical post on this site.
Thanks for all the advice fellas. I know a lot more about my electrical/ignition system after this weekend.
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I'm not really sure, but it may not have been this exact one as I removed and sanded lots of electrical connectors. All ECM connections, all relays and connectors in passenger floor panel, all 9 grounds, left and right door connectors, seat module connector,
So technically it could have been one of those. But the one behind the passenger seat was the only one that looked oxidized.
So technically it could have been one of those. But the one behind the passenger seat was the only one that looked oxidized.