Main IndexAuto Repair Home Search Posts SEARCH
POSTS
Who's Online WHO'S
ONLINE
Log in LOG
IN







2001 Chevy Tahoe Undiagnoseable Electrical Issue


  Email This Post



tahoeopus
New User

Jan 15, 2010, 11:25 PM

Post #1 of 19 (3389 views)
Shortcut
2001 Chevy Tahoe Undiagnoseable Electrical Issue Sign In

2001 Chevy Tahoe 80K miles, auto, V8, 2WD

For the past two years, the Tahoe will lose its electrical charge and won't crank when you turn the ignition if the car has not been started within the last 16-24 hours. So If I don't drive it for a day the car won't crank without a jump. If I drove it consistently I would not experience any problems getting the car started. In the last few months however the car needed to be started every 6-8 hours for no problems to occur, and after this recent cold spell in south florida it now needs to be jumped every time. There are a few other electical issues in the car, sometimes the radio and A/C would not work for a week or two then suddenly spring back to life and work fine.

Ive taken it to 2 different dealerships and neither has been able to reproduce the problem or find any short in the system. I'm thinking they might have a better shot this time around since the car loses its charge within an hour. I really love this truck and just want it to reliably start. Any help or ideas as to what might be causing the issue would be greatly appreciated.


Sidom
Veteran / Moderator


Jan 15, 2010, 11:39 PM

Post #2 of 19 (3380 views)
Shortcut
Re: 2001 Chevy Tahoe Undiagnoseable Electrical Issue [In reply to] Sign In

Well with this type of problem, I'm sure it's probably already been done but since I didn't see it in your post I will mention it and that is the battery needs to be load tested to make sure it's good & capable of holding a full charge.

I would probably start with seeing if there is a draw on the system 1st. From what you've posted it really sounds like there is some type of parasitic draw going on. Anything more than 50mv to 75mv is unacceptable & can drain the battery over a period of time.

I know with GMs there were some problems with the BCMs not going to sleep or waking up after powering down causing a draw.

It's pretty straight forward to check it out. Hook up and amp probe shut the vehicle off and take a reading. Sometimes the equipment needs to be left on there for a while even if you get an acceptable draw right off the bat to make sure something down the line does power up and create a higher draw......






__________________________________________________________________________________________



jms8384
User

Jan 16, 2010, 11:35 AM

Post #3 of 19 (3369 views)
Shortcut
Re: 2001 Chevy Tahoe Undiagnoseable Electrical Issue [In reply to] Sign In

also anouther thing like with the a/c and the radio is check all the grounds. a dirty ground can give you all sorts of electrical problems. but you need to get a book to find them all thay are all over the car. when you go out to start the car does it crankor just nouthing just a "click click". also anouther this that i am shure was checked but idk is get the alt check out.


re-tired
Veteran / Moderator


Jan 16, 2010, 4:12 PM

Post #4 of 19 (3360 views)
Shortcut
Re: 2001 Chevy Tahoe Undiagnoseable Electrical Issue [In reply to] Sign In

Since most DIY folks do not own a amp probe or meter nor the background to interpet the readings, i suggest the following . Buy a good test light ,Sears ,Harbor frieght has them .Disconnect batt neg cable at batt . Clip test lght lead to cable and probe end to batt neg mounting spot . While hooked up touch cable end to its mounting point , this will put keep alive cicuits to sleep . With all acc off , key off the light should be out . Have helper open a door, light should come on . It takes approx 75 mv of current flow to turn bulb on . If light is on with everything off doors shut you have aa draw. Check the most frequent culprits - dome lite switch manualy on ,glovebox lite staying on . hood /trunk light staying on . If none of those , pull fuses one at a time and repeat test each time, replace fuse before going to next. When light goes out you will know which cicuit to check .If all check out , try disconnecting alt . YES guys this is 1950 way of checking , but it is doable by the avg person and is reasonably accurate .


LIFE'S SHORT GO FISH


Hammer Time
Ultimate Carjunky / Moderator


Jan 16, 2010, 4:37 PM

Post #5 of 19 (3358 views)
Shortcut
Re: 2001 Chevy Tahoe Undiagnoseable Electrical Issue [In reply to] Sign In


Quote
YES guys this is 1950 way of checking , but it is doable by the avg person and is reasonably accurate .


It was reasonably accurate in 1950, not so much any more.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



way2old
Veteran / Moderator


Jan 16, 2010, 5:47 PM

Post #6 of 19 (3350 views)
Shortcut
Re: 2001 Chevy Tahoe Undiagnoseable Electrical Issue [In reply to] Sign In

It is still done daily in shops. I venture to guess we all have done it in the last year. That is a quick way to check for the draw before breaking out the high dollar stuff that most DIY'ers do not have.



Being way2old is why I need help from younger minds


Hammer Time
Ultimate Carjunky / Moderator


Jan 16, 2010, 5:53 PM

Post #7 of 19 (3346 views)
Shortcut
Re: 2001 Chevy Tahoe Undiagnoseable Electrical Issue [In reply to] Sign In

He'll never be able to distinguish between a 50ma draw that is totally acceptable and a 150ma draw which is not acceptable.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



re-tired
Veteran / Moderator


Jan 16, 2010, 9:12 PM

Post #8 of 19 (3337 views)
Shortcut
Re: 2001 Chevy Tahoe Undiagnoseable Electrical Issue [In reply to] Sign In

If it lights the light its not acceptable if it dont its ok .It works for me . But remember --I am calendar challenged.your way is more accurate thats a fact.


LIFE'S SHORT GO FISH


Sidom
Veteran / Moderator


Jan 16, 2010, 10:50 PM

Post #9 of 19 (3332 views)
Shortcut
Re: 2001 Chevy Tahoe Undiagnoseable Electrical Issue [In reply to] Sign In

To each their own. I use to use that method all the time years ago with great success...

A test light is a load devise and I have seen them keep modules awake that normally would've powered down and guys chasing their tails. But you have to work with what you have. Definitely wouldn't make sense going out and spending a couple hundred bucks on a tool you're not going to use but then again we don't know what he has in his box.






__________________________________________________________________________________________



re-tired
Veteran / Moderator


Jan 17, 2010, 1:45 AM

Post #10 of 19 (3328 views)
Shortcut
Re: 2001 Chevy Tahoe Undiagnoseable Electrical Issue [In reply to] Sign In


In Reply To

A test light is a load devise and I have seen them keep modules awake that normally would've powered down and guys chasing their tails.

When you touch the cable back to the batt for a few seconds AFTER hooking up test lite you will elminate the load and the modules WILL go to sleep. A good idea would be to show a poster a cheap way AND a proffessional way and let poster choose based on his/her ability and means. Thanks to the Hammer for input on the proffesional approach. I RETIRE my input on this one .


LIFE'S SHORT GO FISH


Hammer Time
Ultimate Carjunky / Moderator


Jan 17, 2010, 7:27 AM

Post #11 of 19 (3325 views)
Shortcut
Re: 2001 Chevy Tahoe Undiagnoseable Electrical Issue [In reply to] Sign In

I guess we just buy these tools because we like spending money and they were never really necessary. In 1950, we didn't have modules running constantly and the light was a go or no go test. Not the case now and if the poster is looking for a parasitic draw, then he needs a way to determine what exactly he is seeing. Most all vehicles will light a test light these days without even having a problem. It doesn't do any good to save somebody money if it's going to send them in the wrong direction as using a test light will.
I suggest the poster follow Sidom's advice if he wants an accurate test.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator


Jan 17, 2010, 8:33 AM

Post #12 of 19 (3322 views)
Shortcut
Re: 2001 Chevy Tahoe Undiagnoseable Electrical Issue [In reply to] Sign In

This has had a dead battery now so many times it must be junk right now. That and I can't figure the common denominator of A/C and Radio quitting intermittently? There's a clue in that, that escapes me right now,

T
_________________________________________
Long retired now


tahoeopus
New User

Jan 20, 2010, 6:46 PM

Post #13 of 19 (3295 views)
Shortcut
Re: 2001 Chevy Tahoe Undiagnoseable Electrical Issue [In reply to] Sign In

Took it to the dealership and told them I had a parasitic battery drain, they looked confused and said they would look into it. Battery was fried from so many jumps and had a bad cell so replaced the battery left at the dealership two nights, started with no problems either time. They said they tested the system and its coming in at 35 milliamps so everything is in range and they couldnt find anything but I'm not convinced the problem has magically disappeared.


Hammer Time
Ultimate Carjunky / Moderator


Jan 21, 2010, 5:38 AM

Post #14 of 19 (3283 views)
Shortcut
Re: 2001 Chevy Tahoe Undiagnoseable Electrical Issue [In reply to] Sign In

Sounds like the problem was the battery all along, should have been tested first.
This shows how testing it properly avoided sending you further down the wrong road. If you had tested this with a test light, it would have lit from the 35ma and you would have wasted a lot of more work chasing false leads.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



nickwarner
Veteran / Moderator


Jan 21, 2010, 12:02 PM

Post #15 of 19 (3277 views)
Shortcut
Re: 2001 Chevy Tahoe Undiagnoseable Electrical Issue [In reply to] Sign In

I guess one question I would have is does this vehicle have an aftermarket stereo with an amp and speaker box? I've seen this problem with a customer who had that setup and let a novice friend install the system for him. Instead of running the amplifier trigger wire to the trigger wire on the deck he wired it to a fused connection that had power constantly. Rewiring this to the deck as it should've been originally solved the issue. He also had to replace his battery for the dead cell from so many starts. Its worth looking at if the problem resurfaces.


Hammer Time
Ultimate Carjunky / Moderator


Jan 21, 2010, 12:28 PM

Post #16 of 19 (3272 views)
Shortcut
Re: 2001 Chevy Tahoe Undiagnoseable Electrical Issue [In reply to] Sign In

He's already confirmed that draw is in acceptable range. The battery was bad.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



re-tired
Veteran / Moderator


Jan 21, 2010, 9:11 PM

Post #17 of 19 (3263 views)
Shortcut
Re: 2001 Chevy Tahoe Undiagnoseable Electrical Issue [In reply to] Sign In

   

"Ive taken it to 2 different dealerships and neither has been able to reproduce the problem or find any short in the system. I'm thinking they might have a better shot this time around since the car loses its charge within an hour".

Guess the techs at two dealers should just throw their meters away. Whilst we where playing does too does not. Sidom had the right answer all along ... they did not do the proper test first :

"Well with this type of problem, I'm sure it's probably already been done but since I didn't see it in your post I will mention it and that is the battery needs to be load tested to make sure it's good & capable of holding a full charge"

Sidom wins the gold star on this one..


LIFE'S SHORT GO FISH

(This post was edited by re-tired on Jan 21, 2010, 9:20 PM)


Sidom
Veteran / Moderator


Jan 21, 2010, 9:55 PM

Post #18 of 19 (3261 views)
Shortcut
Re: 2001 Chevy Tahoe Undiagnoseable Electrical Issue [In reply to] Sign In

You know, I would be lying if I said that I had never overlooked one of the basics & spun my wheels for a few hours only to find out later it was something simple Mad

We try not to but sometimes get tunnel vision when we think we know the problem going off the symptoms and jump in, in the middle. An instructor of an OBD 1 class I went to had a great saying that I try to remember but sometimes forget "Slower is faster".

Two of my blunders are, one an intermittent a/c loss on a Suburban, the other an IAC problem on a Durango. Both of them I spent all day on and both new batteries solved the problem...lmao

I have a basic list I usually run thru and the checking the battery is at the top of it but every once in a while when "I know what it is" I'll cut to the chase........ Man why don't we ever learn.............Sly






__________________________________________________________________________________________



Tom Greenleaf
Ultimate Carjunky / Moderator


Jan 22, 2010, 4:42 AM

Post #19 of 19 (3253 views)
Shortcut
Re: 2001 Chevy Tahoe Undiagnoseable Electrical Issue [In reply to] Sign In

I'm a freak about any battery that has gone dead enough to reset clock or over 3 years old myself. Amazing what a quality new one can solve.

A six month hunt on a seriously handicapped person's family Suburban for a door lock issue. Doors would always lock but wouldn't always open. Not cool when mobility aids are in the back! New battery solved it for two months and it returned?? Intermittently would work or work with engine running for months then act up once in a while. consulted and paid for more help that I was overlooking something.

Luck would have it a Springtime would come and A/C was needed and ducts wouldn't channel thru panel vents. This after the remote receiver was replaced the Fall before which is a pill up over gas pedal.

Turns out the rods for the duct work actuator were broken by another while replacing the receiving module so I while there found the relay - six prong - set of points inside (I l opened old one) for open and another for lock! Just toss it - I was there. That was the whole problem all along and was capable of draining the battery as the relay always has 12v available!

Moral is not to overlook the simple stuff sometimes. As Sidom just said it happens to all of us really only to find the silliest thing was it all along,

T
_________________________________________
Long retired now




2001 Chevy Tahoe Undiagnoseable Electrical Issue


  Email This Post
 
 






Latest Forum Post
I owe a 1992 Dodge Spirit. I have maintained the car as best I could over the y...
1997 Geo Metro 1.3 liter 100,000 miles Hello, my 97 geo metro keeps shuttin...
I have a 2007 Ford Explorer sport trac 4.0 engine- everytime I start it I hear t...
Year of vehicle Make of vehicle (Ford/ Chevrolet) Model of vehicle ( Taurus...
Hey everyone I am new here to the forums but I desperately need some advice, I u...
2009 RAV-4 Sport, V6, 135,000+ km. Within the last 2 weeks there has been inter...

Feed Button


Used Car Search
Used Car Price Ranges:
Under $5,000
$20,000
$35,000

$10,000
$25,000
$40,000
$15,000
$30,000
$45,000
Over $45,000
Search used Cars By Manufacturers:
Used Acura
Used Audi
Used BMW
Used Buick
Used Cadillac
Used Chevrolet
Used Chrysler
Used Dodge
Used FIAT
Used Ford
Used GMC

Used Honda
Used Hyundai
Used Infiniti
Used Jaguar
Used Jeep
Used Kia
Used Land Rover
Used Lexus
Used Lincoln
Used Mazda
Used Mercedes-Benz

Used MINI
Used Mitsubishi
Used Nissan
Used Porsche
Used Saab
Used Scion
Used Subaru
Used Suzuki
Used Toyota
Used Volkswagon
Used Volvo
2010 Honda Civic
$15,770
2004 Jeep
$8,991
2012 Mustang
$22,990
1997 Honda Cr-V
$4,490
2010 Toyota Prius
$17,496
2010 BMW 328
$26,980




Automotive Forum Categories
Automotive Repair
Auto Body Repair and Refinishing
AC Auto Repair Help Forum
Automotive Wiring and Electrical

Auto Insurance and Car Financing
Automotive World
Brake Systems
Car Stereo Repair Advice
Car Troubleshooting
Engine and Car Noises
Engine Fault Codes
Engine Troubleshooting
Exhaust System Repair

Steering and Suspension
Tricks of the Trade
General Discussions
Car Shows and Events
The Bargin Bin
Motor Vehicle Inspection
Car Care Tips
Traffic Ticket Help
Car Racing

Gasoline, Motor Oils, Concept Cars
Remote Control Cars and Vehicles
Truck Repair
Truck Repair Advice


Truck Engine Repair
Truck Suspension Repair
Motorcycle Repair
Motorcycle and ATV Repairs

Motorcycle Body Repair
Motorcycle Clutch Repair
Motorcycle Engine Repair
Motorcycle Seat Repair
Car Forum Posts - Sitemap


Search for (options) Privacy