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Yukon XL 1500

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Question
changed my ignition on a 2005 Yukon GMC now I can't get the car to start and stay on
You have to do the "re-learn" procedure for the ignition switch. The ignition switch/cylinder is part of the anti-theft system. When you replace a key or ignition switch/lock cylinder, you must do this procedure in order for the vehicle to...
Question
Third stop light does not work. checked all fuses to include cruise control...
There is a separate fuse just for the center mount stop light. Check the fuse marked "CHMSL" 10 amp fuse. If you can't find the problem, a certified pro from YourMechanic can inspect the light for you to make necessary...
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
Transfer case trouble
The rolling while in park should not have anything to do with the transfer case as this is a separate piece of the drivetrain controlled by the transmission. There is a pawl on the end of the transmission shaft (assuming...
Question
My truck vibrates in the frount end when i slow down are brake around 30 to 20 mph ive changed the whole set up as far as brakes
Hello. This is a sign of potentially bad or worn wheel bearings. When wheel bearings wear out or become damaged due to dirt or debris or lack of proper lubrication, they will cause this type of vibration which is more...
Question
Truck dying and oil pressure dropping to 0
Your vehicle has a fair amount of miles on it, but the pressure reading should still come up when you are driving. With a new pressure sending unit and a new oil pump, there must be a blockage inside the...
Question
Looks like it will start but it doesn't
Hi, thanks for writing in. This is easily diagnosable because the fault is not intermittent. Based on the symptoms you are describing, you have either a fault in the ignition system or the fuel system. There are some simple tests...
Question
Transmission issues
Hello, thank you for writing in. There can be many reasons more this issue. The vehicle would have to be inspected to determine the cause. This possibly could be a mechanical failure internally with transmission. It would require some special...
Question
My cooling fan comes on after its been turned off for 10 mins. I have replaced one of three relays and the PCM
There is a cooling fan relay fuse in the fuse box that controls the relay switch. This can sometimes fail which will cause the relay to work intermittently causing the fans to also work intermittently. I would recommend checking and...
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
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
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
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
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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