[Z06] High voltage question
Thread Starter
Burning Brakes
Joined: May 2011
Posts: 769
Likes: 2
From: Kapolei Hi
High voltage question
Today when I started the car the voltages shot up to 15.5 and the ABS, AH, TCS all said they needed to be serviced. I had the starter change a couple months ago when I was getting weird voltage readings but they were low and not this high. Any advice on what this could be?
Race Director
Joined: Aug 2004
Posts: 14,639
Likes: 39
From: Winston-Salem North Carolina
St. Jude Donor '08-'09
Today when I started the car the voltages shot up to 15.5 and the ABS, AH, TCS all said they needed to be serviced. I had the starter change a couple months ago when I was getting weird voltage readings but they were low and not this high. Any advice on what this could be?
Thread Starter
Burning Brakes
Joined: May 2011
Posts: 769
Likes: 2
From: Kapolei Hi
Hmmmm I don't remember. I'll have to look it up. Just a few minutes ago the DIC showed a spike to 18 then everything but the ignition system shut off. Scared me a bit since it was dark.
Thread Starter
Burning Brakes
Joined: May 2011
Posts: 769
Likes: 2
From: Kapolei Hi
No battery was good. Had the alternator tested today and the output voltage averaged 15.25 but was spiking as well on the machine. The best of all this is not a single parts store has an alternator near me. I have to wait three days to order one. This makes me so happy......
Team Owner
Joined: Dec 2008
Posts: 35,874
Likes: 1,600
From: Honolulu HI
No battery was good. Had the alternator tested today and the output voltage averaged 15.25 but was spiking as well on the machine. The best of all this is not a single parts store has an alternator near me. I have to wait three days to order one. This makes me so happy......
Intersteing side effect of the high voltage...that it would disrupt the EBCM (causing ABS/TC/AH lights to come on). This further confirms a suspicion I've had with respect to a problematic yet intermitent EBCM on my car. When my old battery was nearing the end of its life, even with a tender, the EBCM would throw a code and trigger the service lights. I replaced the battery and the problem went away within a couple days of stop and go driving. The car isn't a DD, so during the week it sits conected to a tender...sure enough, as soon as I start the car after sitting all week, the EBCM throws a code. Now if I don't leave the car on the tender all week while it sits, and start the car several days later...no codes, no warning lights, nothing. It obviously responds negatively to high and low voltage conditions.
I'm eventually just going to pull the EBCM and send it out to have rebuilt by replacing the relay inside...but for now I just deal with the issue.
Last edited by MTPZ06; Nov 26, 2011 at 10:31 PM.
Thread Starter
Burning Brakes
Joined: May 2011
Posts: 769
Likes: 2
From: Kapolei Hi
Hey, at least you diagnosed the problem quickly and easily.
Intersteing side effect of the high voltage...that it would disrupt the EBCM (causing ABS/TC/AH lights to come on). This further confirms a suspicion I've had with respect to a problematic yet intermitent EBCM on my car. When my old battery was nearing the end of its life, even with a tender, the EBCM would throw a code and trigger the service lights. I replaced the battery and the problem went away within a couple days of stop and go driving. The car isn't a DD, so during the week it sits conected to a tender...sure enough, as soon as I start the car after sitting all week, the EBCM throws a code. Now if I don't leave the car on the tender all week while it sits, and start the car several days later...no codes, no warning lights, nothing. It obviously responds negatively to high and low voltage conditions.
I'm eventually just going to pull the EBCM and send it out to have rebuilt by replacing the relay inside...but for now I just deal with the issue.
Intersteing side effect of the high voltage...that it would disrupt the EBCM (causing ABS/TC/AH lights to come on). This further confirms a suspicion I've had with respect to a problematic yet intermitent EBCM on my car. When my old battery was nearing the end of its life, even with a tender, the EBCM would throw a code and trigger the service lights. I replaced the battery and the problem went away within a couple days of stop and go driving. The car isn't a DD, so during the week it sits conected to a tender...sure enough, as soon as I start the car after sitting all week, the EBCM throws a code. Now if I don't leave the car on the tender all week while it sits, and start the car several days later...no codes, no warning lights, nothing. It obviously responds negatively to high and low voltage conditions.
I'm eventually just going to pull the EBCM and send it out to have rebuilt by replacing the relay inside...but for now I just deal with the issue.
Race Director
Joined: Apr 2004
Posts: 16,135
Likes: 5
From: Newberry FL
Cruise-In VIII Veteran
St. Jude Donor '07
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
Race Director
Joined: Apr 2004
Posts: 16,135
Likes: 5
From: Newberry FL
Cruise-In VIII Veteran
St. Jude Donor '07
Starters & Alternators
(808) 841-9911
307 Mokauea St Oahu
Honolulu, HI 96819
http://localdirectory.hawaiinewsnow....ngid=13120935p
Thread Starter
Burning Brakes
Joined: May 2011
Posts: 769
Likes: 2
From: Kapolei Hi
Nope, but you can try that place right off of North Nimitz about two blocks passed Sand Island Access Road, they are privately owned and operated and he may have a rebuilt one laying around.
Starters & Alternators
(808) 841-9911
307 Mokauea St Oahu
Honolulu, HI 96819
http://localdirectory.hawaiinewsnow....ngid=13120935p
Starters & Alternators
(808) 841-9911
307 Mokauea St Oahu
Honolulu, HI 96819
http://localdirectory.hawaiinewsnow....ngid=13120935p
Thread Starter
Burning Brakes
Joined: May 2011
Posts: 769
Likes: 2
From: Kapolei Hi
Well I was wrong about the alternator. Got the new one in today and same ****. Didn't even get a quarter mile down the road before I got the high voltage fault again. Could something have happen when the new starter got out in that could be causing this or am I missing something?
Team Owner
Joined: Dec 2008
Posts: 35,874
Likes: 1,600
From: Honolulu HI
Well I was wrong about the alternator. Got the new one in today and same ****. Didn't even get a quarter mile down the road before I got the high voltage fault again. Could something have happen when the new starter got out in that could be causing this or am I missing something?
