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Yukon XL 1500

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Question
Gauge lights
If you check the inside and engine compartment fuse boxes you will find you will have more blown fuses. You will have test each fuse and then if you still cannot get the lights to work then try to disconnect...
Question
Not turning over
Hi there. I am a little confused by what's going on with your GMC based on the info supplied. If your engine is cranking over (meaning the starter is spinning when you turn the ignition) but not igniting, it's likely...
Question
Brake light problem
You mention "right" brake light as functioning, at least momentarily, but nothing about the light on the "left". If the right light functions momentarily, but only after replacing the fuse, there is probably a faulty or intermittent connection in that...
Question
SERVICE BRAKE SYSTEM message appears intermittently in the DIC.
Hi there. Before you have any repairs quoted or actually performed, the smart thing would be to diagnose the reason why you're receiving this error message. This would be done by having a professional mobile mechanic come to your location...
Question
Rear hatch door is'nt working
Hello, thank you for writing in. The small motor that lifts the hatch is designed to do only that. Unfortunately, the extra weight and possibility that it was frozen shut may have been too much for it to handle. Make...
Question
Is it best to replace the engine?
When replacing the engine with a rebuilt engine you will need to remove all the outside engine parts from the bad engine and install them into the new engine. The new engine will not have any sensors, covers or any...
Question
Traction control
Hi There, It sounds like you may have a malfunctioning traction control module. The traction control system monitors the steering and stability of the vehicle and engages when loss of traction has been detected. This is done by the use...
Question
Gmc yukon has intermittent long cranks and has a rough idle. Tested fuel pressure at rail. 55psi.
Hello. A fuel pressure that is over 100 psi is extreme unless you vehicle has been modified to run that way. When this is the main focus of the problem you are likely having an issue with the fuel pressure...
Question
Brake rotors
Hi There, What you are describing is a sign of warped brake rotors. When you press on your brake pedal, this activates a hydraulic pressure which forces small pistons inside your brake calipers to push the brake pads against the...
Question
Radiator fan running max frequently
The fan circuit has a relay, switch contacts, and a temperature sensor. There may be other circuit components as well. If the fan is coming on when it is not supposed to, there is a fault in one or more...
Question
Engine in limp mode-- transmission has been checked and found to be fine. 2002 GMC Yukon XL
Hi there - the first task for a "limp mode" warning is to check for problem codes, even if they are intermittent, and whether the Check Engine light is on or not. Find out what is causing the Low Coolant...
Question
I need my catalytic converter replaced. I found out my truck requires a dealer only converter that's California compliant. Is this
Hi there. The folks at CARB (California Air Resource Board) have set emissions standards for California sold vehicles for several years; which includes specific catalytic converter design. So if a mechanic is telling you that you require a specific catalytic...
Question
Service park assist is displaying on dash
Hello, and thank you for writing in. Your vehicle is equipped with the Park Assist feature which will help you park in difficult situations. When the computer system detects there is an issue, the warning light illuminates to let you...
Question
My 2003 GMC Denali randomly apply's the reduced power setting which pushes out less than 50 hp and less than 38 mph.
Check the battery cables on the battery for if they are loose or corroded. Tighten up the battery cables and clean up any corrosion on the battery cables. A loose battery cable or corrosion on the battery cable will cause...
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How to tell if my Yukon has active brake control or not?
Hi there. The best way to determine what braking system you have is to contact your local GMC dealership service or parts department. Make sure you have your VIN # available, as they will use that to determine what system...
Question
Won't start
Hi there. There are several things that could be causing your GMC to not start. Sometimes it will be the crankshaft or cam position sensor that is causing an ignition timing problem. It is also possible that the electrical harness...
Question
Engine
Typically, if a short circuit occurred while replacing the battery, or the battery was installed (momentarily) with reverse polarity, or wires were left disconnected, all of the resulting electrical problems, that is the ones you are observing, would be present...
Question
Belt squeal increases with speed
Hi there. Usually when a belt makes the squealing sound which increases in pitch and volume with the increase in engine RPM it is due to one of two things. First, the belt may not be properly tightened or is...
Question
pads are 2mm on 2014 yukon xl denali with 52000 miles...all works good...incidental finding...do I replace now? Pads and rotors? o
At 2mm, the pads are definitely due for replacement. The the thickness of the brake rotors should be measured and compared to the minimum thickness specifications. If they measure above the specs and there is enough thickness to them, resurfacing...
Question
whining noise front of engine, EVAP and temperature control
Hello, thank you for writing in. The first two symptoms may be related. Finding a leak in the EVAP system will take some time and focus. If the noise goes away after fixing the leak, then we know we can...

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