no power 2007 yukon xl denali

sidbrooks
130

Asked by sidbrooks Mar 17, 2013 at 11:07 PM about the GMC Yukon Denali

Question type: Maintenance & Repair

intermitent no power last couple of days, decided to replace original battery. still no power.

45 Answers

fergie43762
355

Electrical power or is it not got pulling power

sidbrooks
130

no electrical power, fuseable link has conductivity

1 out of 1 people think this is helpful.
tenspeed
50,675

Get the codes read. There may some pending codes that will let you know what system is failing.

sidbrooks
130

wife's car... She indicated occaisional no power but would work after a few seconds. yesterday would not start at all. did a jump started no problem. ran for 30 min or so... a few starts and stops seemeed ok but week on the starts. decided to replace original equipment battery with new... now no power at all, problem is hard....not intermitant with new battery. RnR new with another known good same, no power...

5 out of 5 people think this is helpful.
sidbrooks
130

tenspeed, stupid question but...can codes be read with no power?

judge_roy
Not Active

the codes are stored in a flash memory module which will not forget when power is removed, if this is your question, sir.

2 out of 2 people think this is helpful.
fergie43762
355

Have u checked the fuses user the hood

sidbrooks
130

btw, we have it serviced regularly by GMC dealer. no codes recently. just had airbags and compressor replaced a month ago. no other codes in system...

sidbrooks
130

yes all fuses in the under hood fuse box seem to be ok, verified with multimeter. can't test the same for relays... is there one relay or other which could cause a no power condition? looks like the upper fuse box can be disengaged from the lower box. can it be removed and check wiring harness or other?

sidbrooks
130

bob, thanks. so the code reader (OBD II or III) will supply power requied to read the codes out of flash...?

2 out of 2 people think this is helpful.
fergie43762
355

The voltage regulator that's built in to the alternator may have burned up try testing it advance sells a tester FOR 13.00 plus tax it will let u know if u r getting enough juice back. I'm pretty sure this will fix it

2 out of 2 people think this is helpful.
sidbrooks
130

Fergie, Thanks, Would Napa have it as well... what is the voltage regulator tester called?

1 out of 1 people think this is helpful.
judge_roy
Not Active

If you've done it already, and these found no problems with the operation of various MAF, MAP, EGR, O2 and other delights, we'll have to get old school now-

1 out of 1 people think this is helpful.
judge_roy
Not Active

When you say intermittent power, you mean engine power, not electrical power, correct?

1 out of 1 people think this is helpful.
judge_roy
Not Active

Test the voltage with a multimeter, battery should be at 13.5 volts and will increase when the alternator is sending regulated power to the battery to the tune of 14-15 Volts up to 30 amps-

2 out of 2 people think this is helpful.
fergie43762
355

It's a charging system tester I bought mine at advance so don't really know about Napa. Have u checked the wire harness under the steering column since the airbags was replaced if not check ur connecters just to be on the safe side

judge_roy
Not Active

the GUTS, or bravado this vehicle is supposed to have has gone out the window, to where just keepin' it runnin' is kinda a problem. is this where we stand?

1 out of 1 people think this is helpful.
sidbrooks
130

I have read elsewhere possible fix to the negative battery cable.... could it really be? conductivity seem good from the battery calbe down to the grounds... Bob have not done this yet If you've done it already, and these found no problems with the operation of various MAF, MAP, EGR, O2 and other delights,.... dealer indicated no other codes a month ago.... can not say for certain it holds true today.... though my dealer is pretty good about advising all codes found... minor or not....

judge_roy
Not Active

It's a multimeter they are about 20 bucks for a cheapie- you can test ohms and amps voltages AC and DC-

1 out of 1 people think this is helpful.
sidbrooks
130

bob, I do not think so... this one has been very reliable. no real issues beyond air bags, compressor, and had a problem with the TPMS sensors dealer fixed... not the tx in the valve stem.. problem was one of the reciever....

1 out of 1 people think this is helpful.
judge_roy
Not Active

is the exhaust okay? I mean is it a whitish gray, or BLACK or blue and tainted with oil?

fergie43762
355

There are still several key components that aren't monitored even on new vehicles

1 out of 1 people think this is helpful.
judge_roy
Not Active

probably the last four cases I've helped have asked the following: hose off the battery terminals, negative and positive, scrub the terminals and connectors free of any corrosion including that lolipop w/a hole on the positive side, on the negative side assure solid connection to frame and to engine, it is in this way that the computer will not experience a 'brown out' and start makin' bad decisions~

1 out of 1 people think this is helpful.
judge_roy
Not Active

we put too much power in the hands of our robots. We never had THESE kinds of problems with our Hudson Hornet!

1 out of 1 people think this is helpful.
sidbrooks
130

Fergie, it was the rear airbags for suspension system vs shocks/struts.... Bob, this is electrical.... I have a multimeter..battery power does not seem to be getting distributed. have conductivity on both sides of the fuseable link. will check actual voltage drop tomorrow.

1 out of 1 people think this is helpful.
fergie43762
355

Or Ford couriers

1 out of 1 people think this is helpful.
judge_roy
Not Active

Napa auto parts (nationwide) will have a version of the obd2+3 reader for sale, multimeters both analog and digital...they'll fix you up there with all the best chinese manufactured goods.

1 out of 1 people think this is helpful.
fergie43762
355

Ok let us know how it goes

1 out of 1 people think this is helpful.
judge_roy
Not Active

How many miles are on this 2007?

1 out of 1 people think this is helpful.
fergie43762
355

Not Mazda it's still a Ford it just turned Japanese.

1 out of 1 people think this is helpful.
judge_roy
Not Active

So intermittent power pertains to electrical power. interesting. that's a new wrinkle. hosin' 'er down WILL fix you, your airbag and other codes were reset by the GM guy, so there will not be any. Any check engine lights at all? sid?

1 out of 1 people think this is helpful.
sidbrooks
130

I keep everything clean...inc.. terminals on all my cars. ... '96 honda civic, '99 Expedition, '00 MB E 320 (recently sold double Blue Book) '07 Yukon XL Denali, '12 MB E 350.... this is regular qtr maintenance for me... no corrosion..... had an old opel cadet when I was young where corrosion caused an electrical nightmare.... exhaust is normal... can only see it as faint white vapor when very cold in the morning

sidbrooks
130

Nothing heating up.... No check engine lights, no error codes being sent to the console before loss of electrical. acting like an open somewhere.... Had a 1982 mazda b2000 sport.... ran great.....

fergie43762
355

Definitely check the alternator

1 out of 1 people think this is helpful.
sidbrooks
130

Nearly 150K miles on the Yukon, 165k on the Expedition, 230K on the civic, 175K on '00 MB when sold...

sidbrooks
130

Old battery tested good when I brought it in to Auto Zone nearest open parts place... but it was the factory original..... Yeah Napa sells chinese part but don't they all now...

1 out of 1 people think this is helpful.
judge_roy
Not Active

yeah, I know was just being snyde reflecting on the former glory that used to be America, now when I walk into True Value NOT ONE item is made in america...not even the snap-ons...drat. The proper Ground solution IS the solution as it only takes a couple of days for acid to weep out of your battery onto the surrounding electrics and create a 'brown out' condition where the 'lectronics cannot grab the necessary amperage to finish the job, in this case not enough to give you a strong spark! this has to have been one of the strangest scenearios I've dealt with in my 6 month time as a carguru-

1 out of 1 people think this is helpful.
judge_roy
Not Active

sidbrooks, and fergie43726 (guess that's your zip), it has been a pleasure serving you as much as I could possibly figure out whatinahell was the problem, now that I know A problem, am scratching my head yet. Do try to assure amps can get thru your connections to the chassis and to the engine---that's all the beans I can spill today, tomorrow with a fresh cup of coffee might be able to meditate and solve your dilemma-

1 out of 1 people think this is helpful.
sidbrooks
130

A brownout would not seemingly cause a no power condition even for the lights and bells, chimes... I have nada for power... a bad alternator voltage regulator would seem to affect the charging or drain of the battery... but hey I am not a mechanic.... and I do not have the schematics to chase down the electrical circuits... I will provide the drain #'s thru the alternator tomorrow.. Good night to all...

sidbrooks
130

A brownout would not seemingly cause a no power condition even for the lights and bells, chimes... I have nada for power... a bad alternator voltage regulator would seem to affect the charging or drain of the battery... but hey I am not a mechanic.... and I do not have the schematics to chase down the electrical circuits... I will provide the drain #'s thru the alternator tomorrow.. Good night to all...

1 out of 1 people think this is helpful.
sidbrooks
130

A brownout would not seemingly cause a no power condition even for the lights and bells, chimes... I have nada for power... a bad alternator voltage regulator would seem to affect the charging or drain of the battery... but hey I am not a mechanic.... and I do not have the schematics to chase down the electrical circuits... I will provide the drain #'s thru the alternator tomorrow.. Good night to all...

judge_roy
Not Active

if you mark helpful or best answer for 20, I'm going to be the GURU number 8 just need 165 positive reputation points...then again, probably don't want to be stuck doin' this forever~

1 out of 1 people think this is helpful.
DavidH25
Not Active

Going WAY back up.. 1) sidbrooks there are no stupid questions. Only inadequate ones (NOT YOU) like when somebody posta a question "my car won't start" and does not even give the make year nothing.. But, again, going WAY back up, the codes can be scanned with no power . None at all. the information is stored in a device very much like a USB flash drive and the code scanner supplies it's own power

1 out of 1 people think this is helpful.
judge_roy
Not Active

yes...the brownout. This is caused when the semi-conductors make their decisions on little data, aka 'jumpin' the gun' or wackybrain which can happen, if we're lucky the ECU quits altogether and won't attempt to provide service to your engine- Solid connections under which many amps can be comfrotably drawn, think of your electric 220 dryer and the size of the wires needed to draw amps then think of this dime sized lolipop that we put our very automotive existance on~

1 out of 1 people think this is helpful.
judge_roy
Not Active

inexpensive scan tool~

1 out of 1 people think this is helpful.

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