Question about 2003 GMC Yukon XL

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My 03 yukon xl is having a issue with entire electrical system check engine light dianostic shows low battery low charge when it reads,when operating front power windows all lights dims.scanner shows good batery voltage.

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Check all grounds ie motor to body ground strap connections for corossion, battery to motor ground, battery to body ground. You have to check under bolt to see if there is coeossion. Bad grounding can cause all sorts of electrical problems

Posted on Jul 30, 2010

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2 Answers

Engine stalling when let off gas


The issue you are having has something to do with the fuel delivery system. Which changing the alternator would not fix. the alternator is used for the charging system all it does is keep the battery charged. now I would start with the fuel filter because i'm assuming that it has never been changed before and could have become clogged and if that does not fix it then go to your local advanced auto parts or whatever you prefer and rent a fuel pressure tester they will show you how it works if you ask them and also it wouldn't hurt to ask them if they can hook a scan tool up to your vehicle because odds are there will be some kind of code for it

Dec 07, 2013 | GMC Yukon Denali Cars & Trucks

1 Answer

I have 03 GMC Yukon. It began not starting sometimes. I was told it was the fuel pump (but i hear it whinning when i put the ignition to the on position). Then it began starting when i turned the ignition...


sounds like fuelpump check valve or regulator not holding residual pressure you need to check if fuel pressure is holding with engine off approx. 40 psi

Nov 02, 2013 | 2003 GMC Yukon XL

1 Answer

Gmc yukon denali reduced engine power stability system disabled


I had the same problem in my Yukon Denali And after 4 throttle body's, replacing gas pedal, rewiring the grounds replacing sensors, took it to not one but two GMC dealerships who were useless they can't fix their own trucks they're not the brightest !!!! After thousands of dollars I found a mechanic very familiar with this issue you want the solution it will cost ya 500$ for me to tell ya!! Just kidding I know how frustrating this problem is okay here is the fix the problem is these electric throttle bodies are GARBAGE!!!!!!! Don't matter what u do or what u replace it will come back on unless u convert your electric throttle body to the old cable throttle the actual fix was 900$ but I spent thousands and thousands trying to fix it!!! Please save your money and tell ur mechanic u want to convert to the old cable throttle!!! Gmc is well aware of the problem but won't fix it for u cuz they're useless

Sep 24, 2012 | 2006 GMC Yukon Xl Denali

1 Answer

P1638


My 03 yukon xl has been showing a message on the cluster saying battery not charging and the battery light and message blinks on and off.but got everything tested and everything is good battery alternator fuses wires everything.but when ac is on i lose power and can't drive all day and it will start boring out.so we checked it on the scan and a p1638 code is poping up and saying to check f terminal but can't find it.need help

Jun 04, 2012 | 2000 GMC Yukon XL

1 Answer

Loss of battery charge, with new battery. Amp meter reading charging when motor is running.


Hi, There is a slim possibility that the new (or rebuilt) battery is defective.
Here are the things that cause it. And the things that don't.

The voltage regulator controls how much electricity is used to charge the battery and how much is going into the electrical system of the car. The electrical system may has been designed to integrate the voltage regulator into the case of the alternator. If that is the issue, the alternator can be replaced, or if there is a skilled person that does rebuilds in your area, he will know how to change the diodes in the voltage regulating section of the alternator. You can save money this way. If you have a volt meter or a multimeter, (commonly around $25.00 these days and between $4 and $7 at Harbor Freight), you should get a reading of around 12 volts from the battery when it is charged and the engine is off. If the battery is down, the voltage should still be in that area, but not enough of a kick behind it to do anything but light a small bulb. When the car is started and the voltage regulator is doing it's job you should get at least 13.5 volts DC at the battery terminals.

Many of the symptoms that occur also happen because of poor electrical contact at the battery.
Use Baking soda and water to clean the terminals of the battery of corrosion. And then use a battery cleaning tool for the battery posts and the battery wire clamps that go around the post. Make sure all of the connectors and wiring is sound.

I would then test all of this doing the following steps..

Charge up the battery.

Then connect the system and do the voltage checks. If the Battery is charging properly, the regulator will gradually reduce the charging voltage it is using to charge.

After 15 minutes, shut the engine down and check the battery voltage. and turn on the headlights to see if they are still bright.

If the voltage is at 12 volts DC the battery is OK.

One very simple test of a charging system is to charge the battery, start the engine, then pull the positive terminal off of the battery. If the engine dies, then the voltage being generated from the alternator is too weak.

If your battery is bad it will show low voltage. If one of the plates in it is shorted out. The voltage will be 10 Volts.

Hope all of this helps,
Happy New Year,
Mark

Jan 04, 2011 | 1996 GMC Yukon

2 Answers

Battery won't hold a charge


There seems to be a no charge state in this case. I recommend checking the battery first, then, move on to the charging system. Use the procedure below to isolate this issue.

Wear protective eye wear and clothing and remove all jewelry when checking your battery and charging system. Jewelry is a good conductor of electricity and is not recommended. Most batteries wear out every 3 to 5 years and need to be replaced. Always replace your battery with an equal replacement battery to assure proper operation. Automotive batteries have a positive terminal (red), negative terminal (black). Electricity is stored in the battery and then supplied to the vehicle when the engine is not running. While the engine is running the vehicles alternator charges the battery for future use. (Note: never disconnect the battery while the engine is running). To check a battery surface voltage, remove the positive terminal protective cover. Connect the positive side meter lead (red) to the positive side battery terminal. Connect the negative (black) side meter lead to the negative battery terminal. With the vehicle not running and the car sitting over night the battery voltage should be between 12.5 and 12.8 volts.(You will need to use a voltmeter for this testing procedure). If the voltage is not up to specs, replace the battery asap. If the battery is ok and showing good voltage readings; Move on to the alternator/generator drive belt and amperage test.

The alternator is rotated by a drive belt, which is, driven by the vehicles engine crank shaft pulley while it is running. Electrical voltage and amperage are generated to recharge the battery and supply voltage to the electrical system of the car. The alternator is held in place with mounting bolts. There is a main electrical wire on the rear of the alternator that supplies voltage to a main voltage junction box. If your alternator is not charging properly, your battery will slowly drain down from operating all the electrical systems in your car and stop the car from running. Most non charge states will be the cause of a loose belt or a low tension rate, due to a mis-adjusted alternator. Make sure you have enough tension in the belt for full rotation of the alternator pulley.

Next, you will need to check the alternators output with the Amp meter.

Testing the amperage output of an alternator is good for measuring the amount (not the level) of voltage the alternator can produce. This test can be tricky because if the alternator is weak it can still show it as producing amperage(False reading); Which is good, but if the voltage is low, it will still allow the battery to go dead. To check the amperage output of an alternator an amp meter will be required. Once the meter is connected start the engine. Next; Turn on all electrical accessories and raise the engine idle to about 1300 RPM. The alternator should produce the max amperage it was designed to produce. Example: a 90 amp alternator should produce about 88 amps. An alternator cannot sustain maximum output for long periods of time. If the alternator is forced to operate at maximum output it will overheat and fail(due to a failed regulator). An alternator is designed to operate at max amperage output only for a reasonable amount of time. Once you have verified the amp readings, check the voltage. To check the voltage, Connect the voltage meter lead the same way you would in a battery static voltage check, Start engine (do not drive). At engine idle, the voltage should be between 13.6 to 14.3 volts. If not the alternator may need replacing.


  • NOTE_ Be sure to inspect the battery terminals for connectivity issues such as corrosion and so fourth..

Nov 21, 2010 | 2003 GMC Sierra 1500

1 Answer

Hi! I have a gmc Yukon xl that recently the battery light has come on and it reads battery not charging. The car starts fine and runs well, does that happen when the alternator I going out?...


That is correct! Your alternator isnt putting out the necessary voltage/amperage to keep the battery light off.

Have the vehicles charging system checked at a local parts store. They can also do a free load test on the battery. Just to be sure.

Nov 01, 2010 | 2003 GMC Yukon XL

1 Answer

2004 YUKON XL DENALI, new throttle messed up delayed shift points


I recently had a low engine power on my 2003 Denali. The check engine light came on and I couldn't go above 40 mph. I took it in the next morning but by this time the check engine light had gone off. The mechanic had just recently seen the same problem in another Denali in which they changed the battery and had no problems since. I also decided to have them change out my battery and I have not had the problem since either. I would stay away from the dealership if I were you, and always get a second opinion. Most smaller shops wont charge for a diagnostic where the dealership will charge at least 80 just to tell you what might be wrong and that will only work if you have a warning light on at the time.

Jan 22, 2010 | GMC Yukon Denali Cars & Trucks

1 Answer

2007 yukon xl battery dead recharged battery will not start no security light no gages work when you turn the key on. try to start the engine nothing happen like the security system shut down. can you...


We had the same issue with our 2007 Yukon Denali XL. Died on us twice after sitting for short periods of time; once we watched a DVD with the engine off and battery died within 10 minutes. The dealership kept it overnight to troubleshoot why the battery died so quickly. They said the radio was "pulling" too much from the battery. (They supposably fixed it) But again a few days later the battery died again after sitting overnight. We brought it back to the dealership and they brought in a GMC "expert" to replace the entire DVD/CD/Navigation system. They also replaced our battery with a much larger battery, similar to the ones that GMC puts in there diesel trucks. They had our Denali for 5 days, but it appears to be fixed now.
Getting it fixed correctly wasn't without headaches, but it was all covered under warranty, including the battery. And they are updating the nav w/ the new edition disc as well for no charge.

Apr 13, 2009 | 2007 GMC Yukon

5 Answers

2003 GMC throttle position sensor


I had the same problem with my 2003 denali and came to find out that it was the battery causing the problem. the battery with sufficient power will dictate the tps. if the battery is low or bad, it won't have enough juice to allow the tps to. work. get your battery checked.

Dec 09, 2008 | 2003 GMC Yukon

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