2005 Chevrolet Tahoe Electrical Issues

CODYDFEDRIC

MEMBER
2005 CHEVROLET TAHOE
177,000 MILES

I have a 2005 Chevrolet Tahoe Z71 4x2. Leaving work the other day I recieved a replace liftgate fuse on the dash as well as a service stability message. I went home, it drove fine. Later that night I went to leave and I had no headlights, no interior lights, no power door locks in the rear doors (front door locks work fine), no fog lights. Blinkers work fine. Now, I am unable to start the truck. It will crank and crank but will not turn over. It is like the security system is activated now. Battery is good (2 months old) and alternator was checked and is working properly. Since this started, I have seen service air bag error, check oil level messages on the dash. The only thing I have done in the last year to the truck are normal oil changes and I had the battery replaced. My old battery was an optima battery and lasted 7 years. Any suggestions on what to look for?

3 Replies

HMAC300

MECHANIC
48,601 POSTS

This sounds like a battery problem even though new, have checked for condition and load test first. Check fuses in underhood fuse box first then try resetting anti theft.

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Thursday, July 4th, 2013 AT 8:31 AM

CODYDFEDRIC

MEMBER
2 POSTS

Ok. I had the battery tested. It was bad. Replaced it with a new one that tested good before I installed it. Now the Tahoe will start and runs fine. Still have other issues with no headlights and interior lights. All fuses are checked and good. When the Tahoe would not start, it threw code U0107. Code has been cleared. Security issue seems to be gone with new battery. I know it works off of voltage. The battery gauge read 19v after installing new battery then went right back to 9v. I am trying to find a volt meter to test the voltage at the starter from the battery etc. Could there be a fuse somewhere other than driver's side and under the hood that is bad causing all these issues? It still says service stability on the dash and this is the only error I have seen since I replaced the battery.

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Thursday, July 4th, 2013 AT 10:58 AM

HMAC300

MECHANIC
48,601 POSTS

Check the headlamp relays with a like relay as there are two one for low and one for high, it could be either the headlamp switch or multifunction switch as the lights go through that as well. It may be a bcm problem so best get it scanned as it may need reprogramming to get them to work. I am not familiar with service stability systems so that can be checked when scanned for headlights. The u0107 is a throttle position thing but probably went away with new battery as old battery was giving false codes. There is also a generator control module so that will need scanning as well to see if that is screwed up. That's the problem with todays cars with all the modules it normally needs a pro type scanner to fix these and track down the problems.

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Thursday, July 4th, 2013 AT 12:13 PM