Erratic and odd indications
Thread Starter
Instructor
Joined: Feb 2011
Posts: 112
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From: Ruidoso NM
Erratic and odd indications
Just finished a 3,000 mile round-trip in my C5, it was awesome. One odd thing happened that scared the heck out of me. I was passing and the auto downshifted and accelerated, then all of a sudden it started flashing reduced power, active handling, security tire pressure etc. even the airconditioner started blowing warm air, it continued until I pulled over, shut it off and when restarted all was well. I do have a diablo tune in it but other that that and corsa tips it is bone stock, any ideas?
Last edited by Ruidoso Bill; Aug 24, 2011 at 09:17 PM.
Racer
Joined: Jul 2007
Posts: 481
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From: Tucson Arizona
Grounds or battery
I would check your ground connections. There are several listed in the service manual. Or do a search in this forum. I am sure you will find several threads. Next have your battery load tested....even one a little weak will do strange things in a C5. Again many threads on that topic too.
Thread Starter
Instructor
Joined: Feb 2011
Posts: 112
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From: Ruidoso NM
Erratic and odd indications
I would check your ground connections. There are several listed in the service manual. Or do a search in this forum. I am sure you will find several threads. Next have your battery load tested....even one a little weak will do strange things in a C5. Again many threads on that topic too.
Safety Car
Joined: Feb 2001
Posts: 3,725
Likes: 53
From: Warrington Pa.
Did you hit a bump??? I would check the wiring in the drivers side A pillar and the door. Pull back the accordion tube and check the wires that are in the pillar, There are two bundles. Unplug and clean the contacts and put everything back. Here's a thread that will help with grounds and the door wiring .....
http://forums.corvetteforum.com/c5-t...tion-long.html
This is a large thread, but contains a batch of info.
http://forums.corvetteforum.com/c5-t...tion-long.html
This is a large thread, but contains a batch of info.
Tech Contributor
Joined: Dec 2006
Posts: 10,962
Likes: 29
From: Van Buren Arkansas
Wounded Warrior Escort '11
The door jam accordian tube is a real possibility here but the very first thing you need to do is to pull your codes and post them all. Be sure to include the "H" or "C"s with each.
Thread Starter
Instructor
Joined: Feb 2011
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From: Ruidoso NM
Erratic and odd indications
U1255H
U1301H
U1088H
U1096H
U1016H
U1064H
U1300H
U1626H
U1176H
U1160H
This car had 9300 miles when I left on my trip.
Last edited by Ruidoso Bill; Aug 25, 2011 at 12:25 AM. Reason: content
Instructor
Joined: Feb 2011
Posts: 126
Likes: 1
From: Corpus Christi Texas
Any code that ends in H is a history code (something that has occured in the past) but is fine now.
U1255H Serial Data Line Malfunction
U1301H Class 2 Circuit Shorted to Battery
U1088H Loss of Communications with SDM
U1096H Loss of Communications with IPC
U1016H Loss of Communications with PCM
U1064H Loss of Communications with BCM
U1300H Class 2 Circuit Shorted to Ground
U1626H ???? can't find this one, but P1626 is Theft Deterrent System Fuel Enable Circuit
U1176H Loss of Communications with RFA
U1160H Loss of Communications with LDCM
I'd start with taking my battery to my local Interstate dealer and have it load tested. They'll do it free, and it just takes a few minutes. Once I was confident I have a healthy battery, and good battery connections, I would sure suspect an intermittent loss of a ground connection somewhere.
U1255H Serial Data Line Malfunction
U1301H Class 2 Circuit Shorted to Battery
U1088H Loss of Communications with SDM
U1096H Loss of Communications with IPC
U1016H Loss of Communications with PCM
U1064H Loss of Communications with BCM
U1300H Class 2 Circuit Shorted to Ground
U1626H ???? can't find this one, but P1626 is Theft Deterrent System Fuel Enable Circuit
U1176H Loss of Communications with RFA
U1160H Loss of Communications with LDCM
I'd start with taking my battery to my local Interstate dealer and have it load tested. They'll do it free, and it just takes a few minutes. Once I was confident I have a healthy battery, and good battery connections, I would sure suspect an intermittent loss of a ground connection somewhere.
Last edited by Pewter Scooter; Aug 25, 2011 at 01:33 AM.
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
The U codes are symptomatic of a power glitch. You can clear them down but I doubt any will come back any time soon.
You had good advice already. Its worth checking anything which might cause a power interruption so battery state, battery leads, grounds and door accordian connections would also be my suggestion.
If it's any consolation, it happened to my car many years ago just before the battery died and it never reoccurred. Could be just a one-off.
You had good advice already. Its worth checking anything which might cause a power interruption so battery state, battery leads, grounds and door accordian connections would also be my suggestion.
If it's any consolation, it happened to my car many years ago just before the battery died and it never reoccurred. Could be just a one-off.
Last edited by DeeGee; Aug 25, 2011 at 02:42 AM.
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Tech Contributor
Joined: Dec 2006
Posts: 10,962
Likes: 29
From: Van Buren Arkansas
Wounded Warrior Escort '11
I agree...check the door accordian tube as there's a connector there with a serial data buss wire in it that will get lose over time and can cause these problems. The 1300 code has me concerned as its attached to the TCS system although I'm thinking your posting of U1300H should have been C1300H. Clear all of the codes now and see if any come back.
Safety Car
Joined: Feb 2001
Posts: 3,725
Likes: 53
From: Warrington Pa.
Any code that ends in H is a history code (something that has occured in the past) but is fine now.
U1255H Serial Data Line Malfunction
U1301H Class 2 Circuit Shorted to Battery
U1088H Loss of Communications with SDM
U1096H Loss of Communications with IPC
U1016H Loss of Communications with PCM
U1064H Loss of Communications with BCM
U1300H Class 2 Circuit Shorted to Ground
U1626H ???? can't find this one, but P1626 is Theft Deterrent System Fuel Enable Circuit
U1176H Loss of Communications with RFA
U1160H Loss of Communications with LDCM
I'd start with taking my battery to my local Interstate dealer and have it load tested. They'll do it free, and it just takes a few minutes. Once I was confident I have a healthy battery, and good battery connections, I would sure suspect an intermittent loss of a ground connection somewhere.
U1255H Serial Data Line Malfunction
U1301H Class 2 Circuit Shorted to Battery
U1088H Loss of Communications with SDM
U1096H Loss of Communications with IPC
U1016H Loss of Communications with PCM
U1064H Loss of Communications with BCM
U1300H Class 2 Circuit Shorted to Ground
U1626H ???? can't find this one, but P1626 is Theft Deterrent System Fuel Enable Circuit
U1176H Loss of Communications with RFA
U1160H Loss of Communications with LDCM
I'd start with taking my battery to my local Interstate dealer and have it load tested. They'll do it free, and it just takes a few minutes. Once I was confident I have a healthy battery, and good battery connections, I would sure suspect an intermittent loss of a ground connection somewhere.
Last edited by Bill Vett; Aug 25, 2011 at 11:00 AM.
Safety Car
Joined: Feb 2001
Posts: 3,725
Likes: 53
From: Warrington Pa.
I found the post in the electrical sticky for you to read.
http://forums.corvetteforum.com/c5-t...n-long-18.html
Page #18 Post #356
http://forums.corvetteforum.com/c5-t...n-long-18.html
Page #18 Post #356
Safety Car
Joined: Feb 2001
Posts: 3,725
Likes: 53
From: Warrington Pa.
The information on the page that you reference was later updated by the author, Bill Curlee, after he and I exchanged several PM's. The correct information is on page 30 and in post #586
http://forums.corvetteforum.com/c5-t...n-long-30.html
Then scroll down to post #586. Note the correction date of 2/2011. Unfortunately there are numerous other posts with the same descriptions and pictures in the thread that have not been updated. But the bared wires in the pictures are actually speaker grounds and do not need to be coated. The black connector in the door is usually what is the problem. Loose connections, bent pins and or corrosion on the pins.
http://forums.corvetteforum.com/c5-t...n-long-30.html
Then scroll down to post #586. Note the correction date of 2/2011. Unfortunately there are numerous other posts with the same descriptions and pictures in the thread that have not been updated. But the bared wires in the pictures are actually speaker grounds and do not need to be coated. The black connector in the door is usually what is the problem. Loose connections, bent pins and or corrosion on the pins.
Thread Starter
Instructor
Joined: Feb 2011
Posts: 112
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From: Ruidoso NM
I thank you all for the replys, I was on a retreat all weekend and will start checking things out today. I will start with the battery, it is the origiginal on an eight year old card and then the door accordians next.
Thread Starter
Instructor
Joined: Feb 2011
Posts: 112
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From: Ruidoso NM
I first replaced the battery, the one in there was the original and 8 years old. It had the same erratic indications all over again, guess the battery wasn't the cause. Started with the grounds behind the headlights, they were both clean but I touched them up anyway. Did the battery to chassis ground, it was a little dirty but not bad either. Did both the door "accordian" connectors sprayed with radio shack contact cleaner. Did a quick test drive and got on it and so far no codes or erratic behavior.
The only 78 series I could find was from walmart, hope that is sufficient for now, I intend to order a redtop optima soon.
The only 78 series I could find was from walmart, hope that is sufficient for now, I intend to order a redtop optima soon.
Last edited by Ruidoso Bill; Sep 3, 2011 at 08:49 PM.