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Yukon XL 1500

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Question
Engine rpm not steady at 40-55 mph
This is a common sign of a failing throttle position sensor. The throttle position sensor (TPS) is a sensor used to monitor the throttle position of a vehicle. The sensor is usually located on the butterfly spindle/shaft so that it...
Question
Turning brights on causes the engine to die
Hi. This sounds like the the alternator is weak and is going bad. When you turn on the head lights, A/C system, or radio it puts a load on the alternator and the alternator should be able to handle this...
Question
Vents blowing cold Air. Heat inop.
Hey there: If your engine is not overheating and you've flushed the core and coolant correctly, it's possible that you may have an electrical issue causing the heater to not function correctly. I'd start by checking fuses and relays powering...
Question
Transmission keeps going out - 2007 GMC Yukon XL 1500
Hello. It sounds like you do not have a transmission problem at all. I have seen this same vehicle have electrical issues which will cause the vehicle to stop shifting correctly. If the transmission continues to go out, I would...
Question
Oil relief valve issue shortly after oil was changed
I'm curious as to what "weight" of oil they put in. Most manufacturers now warn against using anything heavier than 10W30 for oil pressure relief valve (overpressure on cold start) reasons. While this is not common, overpressure due to a...
Question
Blower motor isn't working
Hi there. The fact that no air blows at idle but once the car moves you get flow makes it sound like the blower motor isn't really turning at at all, but rather you have the door set to outside...
Question
Knocking on the right rear wheel
Hello, thank you for writing in. The vehicle will need to be inspected further at this point. The sound may be coming from the tire, the hub assembly, the brakes, or the suspension. With that being said, a trained eye...
Question
Truck sounds very loud when I step on gas...maybe muffler? 2007 GMC Yukon
Hello - this new, louder sound level could be the muffler, catalytic converter, an exhaust gasket or one of the connecting exhaust pipe(s). I would recommend having an exhaust system inspection by a mobile, professional mechanic, such as one from...
Question
No front or rear license tag park lamps
Hey there. Any lights that are dark may be caused by bad wiring or a number of other issues. You are doing good to work through the circuit in your search. Under the conduit may be corrosion or a broken...
Question
Driver side headlights are dim. When I flash brights, the engine dies.
Hi and thanks for contacting YourMechanic. First check the battery cables for a clean and corrosion free contact. If the battery is good, then there is a problem with the wiring in the steering column. There is a short crossing...
Question
New battery still won't start
If the battery is new and fully charged and nothing happens when you turn the key, there is something wrong in the starter circuit and/or you have a defective starter motor and/or solenoid. If you want the starter circuit diagnosed,...
Question
How to remove a keeper stuck in the right differential shaft housing? 2005 GMC Yukon XL 1500
Hello - I have had reasonable success removing keepers and snap rings using a combination of picks and magnetic probes. Pick sets (which come in a variety of straight and angled configurations) usually get the offending bit loose, and the...
Question
No click no crank no start
It sounds like you ran your battery down. You should first jump start the battery to see if the vehicle will crank up. If you get it started again then get the dead battery recharged and then have it load...
Question
my yukon will not start unless i prime it
The hard to start condition is going to be a fuel pump pressure related issue most likely. You will need to have the fuel pressure checked at the fuel pressure fitting on the fuel rail. The fuel pressure should be...
Question
Starting issues
This may be a sign of a weak battery, a failing voltage regulator or failing alternator. As you may know, the alternator is responsible for charging the battery while the engine runs by generating amperage and recharging the battery while...
Question
How many quart does rearmed hold
The rear axle gear oil capacity is 2.75 quarts. If you purchase 3 quarts you will use most of all of the three quarts.
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
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
Need to know the backlash specifications for a 2006 Denali transfer case.
Hi there. On most applications that deal with gear lash or known as backlash there is very low amounts of lash to prevent damage to the gears but also allowing the metal to expand. For your transfer case, set the...
Question
Instrument cluster acts like there is a short in it.
Hi there. There are ground wires in the dash that need to be checked that are related to the instrument panel. See if the ground wires are tight and free of corrosion. Then check the battery cables for that they...

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