Question about 2003 GMC Yukon

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GMC 2003 Yukon What maitence needs to be done?

Okay. I have a GMC 2003 Yukon. It runs perfectly. Never had any problems with her. And I want to keep it that way. I always get Mobil 1 synetic oil every 6000 miles. Just recently changed out the front/rear diffs and transfer case oil. Changed out my transmission fluid last week. Any other engine maitence needed?

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If you look in owners manual all maint. sched. is in it.

Posted on Mar 02, 2009


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Catalyst not ready on 2003 yukon

keep driving it.

it takes time once the codes are cleared for all the system checks to take place. This was done by the auto manufacturers to help eliminate the check engine light cheaters for emissions testing. Now the vehicle needs to be driven for enough drive cycles to satisfy the engines computer that everything is working properly.

Mar 07, 2015 | 2003 GMC Yukon

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After changing the battery in my 2003 gmc yukon denali I have issues with computer not letting the truck run correctly, any help

Un plugh negative connection of battery cable at night keep it as it is for next morning and connect it start the vehicle but be sure dont switch on the Aircon for next 20 min. if your problem solve other check the fuses and if not ok contact to the dealer.

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LEDs overload the original flasher relay.. replace it

if no better
run a new wire for the right trailer turn signal
and check the earths


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1 Answer

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What size engine ? 4.3 L vortex P0300 random misfire code is usually associated with vacuum leaks , but could also be low fuel pressure , plugged fuel filter , fuel pump problem , clogged injectors etc... doing fuel pressure an flow testing would confirm or eliminate that as a problem . Fuel injector balance testing would confirm or eliminate clogged injectors .

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Why does ny service break system light and abs warning light come on gmc yukon 2003


Jun 09, 2010 | 2004 GMC Yukon

2 Answers

Sunroof stuck open on 2003 gmc yukon. When you push the switch it tries to move but can't. any ideas?

Had the same problem with my 2003 Denali, dealer said they would have to replace the entire "module" for around $928, plus four hours labor. I called a sunroof repair shop and they said to hold down the "close" button for 10 seconds and it would re-set itself. It worked perfectly. Never going back to that dealer again!

Apr 01, 2010 | 2003 GMC Yukon

1 Answer

GMC 2003 Yukon

I can only say continue the maintenance but there is so much evidence now that synthetic oil is far superior, it is all some manufacturers will allow for warranty. Google "toyota sludge" or "chrysler sludge" Modern engines are built with such tight emission regs that if the oil breaks down, it will make qick work of your money.

Mar 14, 2009 | 2003 GMC Yukon

1 Answer

I have a 2004 GMC Yukon. The engine light keeps

Check for vacuum leaks, especially the intake gaskets. Does it run rough on a cold start for a few seconds and then smooth out and run fine until the next cold start?

Mar 12, 2009 | 2003 Saturn VUE

1 Answer

2003 gmc yukon wont idle

I know that this will sound Stupid. Change the Fuel Cap. If the Seal on the Gas Cap is Bad it will allow Air to get into the Fuel tank and cause your Rough Idle.

Jan 23, 2009 | 2003 GMC Yukon

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