Last post on Nov 26, 2013 at 1:42 PM
You are in the Chevrolet S-10 & GMC S15 Sonoma
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Chevrolet S-10, GMC S-15, GMC Sonoma, Electrical, Truck
#408 of 444 Re: 2004 Chevy S-10 Electrical meltdown [willieperkins]
Sep 02, 2011 (12:14 pm)
Hello there. I am a new member to the site and I own a 99' GMC Sonoma. I have extensive working knowledge of GM's absolutely substandard wiring, parts and customer service so I will help you as much as I can. The advice I am giving should help many of you who have posted questions so here we go. My 01' Astro and my 99' Sonoma are both showing signs of extensive electrical issues and because of this I have done extensive research and troubleshooting as to prevent further damage and catostrophic failure such as airbags deploying and fires. YOU NEED TO KNOW THAT ALL WIRING IN LATE MODEL VEHICLES IS SUBSTANDARD AND VERY DANGEROUS ALL DONE TO SAVE COMPANIES MONEY...IT IS NOT JUST GM. We have our governing agencies to thank for the lax requirements. The new standard for automotive wiring is to place 2-4 copper strands in each wire instead of the "old fashioned" bundle and these will fail. The only way to remedy this is to spend the extra money for a HIGH QUALITY aftermarket harness and devote 20-30 hours of labor changing it all out (should you decide to do this, I recommend boxing up the original wires and fed-exing it to your local transportation authorities with a pleasant thank you card for their hard work). However there are common faults in GM's that could help you save time and money.
1.) Instrument clusters on 94' and later vehicles are CRAP! You cannot repair nor service them with "resistor kits or any of that nonsense so dont waste your time. If you decide to replace it choose a nice aftermarket one that you like (will usually be cheaper than OE part and you will not be condoning the manufacturers original incompetance) but also remember you are required to have the new onw "mapped" as to set the odometer to the mileage of your current one.
2.) IGNITION SWITCH FAILURE and/or bad ground. Start your engine then wiggle your key and switch assembly...you will be surprised how many issued this will cause if it fails...radio crackling or cutting out, lights acting up, guages acting up, engine running rough and/or dying, and so on and so forth.
3.) Fuse box (engine and under dash) as described above these horrible wires break continuity but APPEAR fine. You must use and ohm meter to check for breaks in the wire from start to finish (dont forget to contort the wire and watch meter for variations)
4.) Bad chassis to engine ground straps. CHECK THEM ALL ! ! ! ! Again, substandard materials that corrode and fail because they SUCK
****BE SURE TO BE CAREFULE OF ALL YELLOW CONNECTORS ! These are part of the SRS system and can cause airbags to deploy if tampered with. If you absolutely must mess with these DISCONNECT THE BATTERY ! It usually will cause injury if deployed and can cause DEATH.****
Bottom line is that I am a GM guy but will be the first to tell you that the ENTIRE automotive industry is using substandard practices while building our vehicles but they are not entirely to blame. It should be illegal for these common but critical issues to be ignored and passed on to us to repair and recall campaigns should be issued. Maybe if enough of us contact our local and federal agencies enough to be a thorn in their side we will see something happen. I am ready, so lets do it. Feel free to email me with any specific questions. BE SAFE and good luck. GOD Bless.
#409 of 444 2002 s10 electrical and trans issues
Oct 06, 2011 (5:57 pm)
I have a 2002 v6 auto s10.
The issue started where the gauges other than the oil pressure and volt would drop off and the transmission (auto) would then be stuck in third gear even after the gauges would shoot back on. The problem got worse over a year (gauges dropping off more often and transmission stuck in third). Six codes pulled up that ECM/trans sensors. I just had a new ECM installed. Now the gauges show up until I actually start the engine, then they drop off immeditately with a jump on for a second ever so often and trans is stuck in third. I have been able to manually shift to 2nd starting off from a stop and then manually shifting to third in order to keep from killing the transmision. Unable to manually go into first or forth and no gauges makes for a interesting drive. Any ideas. I don't want to just start replacing transmission sensors in hopes for solving the issue.
Side note: before replacing the ECM "sometimes" the gauges stayed on and the transmission worked perfectly. The day I dropped it off to have ECM put in a 10 minute trip it ran perfectly no issues start from house to shop (of course) but knew it was there so had them do the ECM anyway hoping to resolve issue.
It took the shop 4 tries to get ECM to pass security set up to allow engine to run.
Does this sound like a poor ground, wire short, bad ignition column cylinder, or trans sensor or other? I have seen others with this issue on the net but have not seen a direct answer for 2002 s10 v6 automatic.
Engine has never skipped a beat during all this nonsense.
A VERY BIG THANKS in advance.
#410 of 444 Re: 2002 s10 electrical and trans issues [rdv6s10]
Oct 06, 2011 (6:09 pm)
Here is another blogger that I found with the same issues.
03-15-2009, 09:02 PM
I have a 2003 s-10 truck, and I have been having many problems with this truck. Right now i get SERVICE CODES P0758, P0740, P0753, P0785, and i have replaced the TCC solenoid and the wiring harness, i have also replaced both a and b solenoids. and still had the codes showing. I was told to try the ignition switch harnes, and that also did not fix my problems. I have no gauges,(only alt, and oil pressure), and it feels like i am stuck in 2nd gear, and there seems to be no power to go at all. Could it be my computer needs to be flashed or maybe a relay i don't know about? Please Help. Thanx
#411 of 444 Re: 2002 s10 electrical and trans issues [rdv6s10]
Oct 07, 2011 (7:22 am)
Not sure what he meant by ignition switch harness. The ignition switch will cause this problem, the electrical one, not key.
#412 of 444 Re: 2002 s10 electrical and trans issues [gonogo]
Oct 07, 2011 (1:41 pm)
A Big Thanks. I will give it a shot.
#413 of 444 Re: 2002 s10 electrical and trans issues [rdv6s10]
Oct 08, 2011 (12:10 am)
i've got a '96 2.2l 5spd. and everything , i mean everything works down to the lighter, courtesy light and all bulbs in between. i guess i'm the lucky one
#414 of 444 Re: 2002 s10 electrical and trans issues [s10atious]
Oct 08, 2011 (7:53 am)
My 99 2.2 auto does too.
Oct 19, 2011 (7:07 am)
i left the key on overnight and had a dead battery, i put the charger on it without disconnecting batt., then started it, with charger still hooked up, i think i killed my alternator, when truck is running, and i take the neg. batt. cable off it shuts down. battery light is on, guages failed, i needed a new batt. anyway, so i bought one, the guages work, 4 now, i drove to work, but left it there, so i didnt have to drive home at night using lights. seems like alt., but i would hate to buy and install, and find out its a brain, or wire harness, or something. any advice is appreciated. chevy s10 2000
#416 of 444 Re: fried [hamerdown]
Oct 19, 2011 (8:08 am)
First, NEVER, ever connect a battery charger to a automobile with battery cables connected as the amperage from charger is much different thatn that of the charging system. You said that while truck is running you disconn the neg. cable and it dies...do the same thing but disconnect the pos. Does it die? Do you have a voltmeter? If you do, start the truck and check voltage at the battery (black lead to neg. cable, red to positive) Your charging system should be putting out 13.8-14.5 volts. If it is not, replace the alternator. Also, most parts stores will test your alternator for free....simply remove the alternator and they will put it in a carbo load tester with a "pass/fail" result. This does sound like an alternator issue. If it where a harness or computer you would get a check engine light and other systems of the truck would not work. Feel free to email me should you need furher assistance. kngjmz.1gmail.com
#417 of 444 Re: Sonoma ELECTRICAL ISSUES [jfogelberg]
Oct 20, 2011 (7:26 pm)
After reading your post I realize that I am not the only one with this exact problem. When you spoke about the watching the volt guage float from 14 I literally had "deajavue" of driving in my 98' Sonoma. Since it has been over 4 years since your last post I am wondering if you found your problem and if so...WHAT WAS THE PROBLEM!?!? Please help! Thanks!