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Yukon

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A Buyer’s Guide to the 2012 GMC Yukon
When you want a big SUV that can hold its own, come what may, you’ll be happiest with a GMC Yukon. Although the inside of one of these vehicles can sometimes resemble an...

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Question
Throttle is not responsive - 2003 GMC Yukon
Hi there. From the description your vehicle only shakes in first gear, with delayed upshift seems unusual. Assuming the P0300 code is continuing to return, it leads me to believe you may have a fuel delivery issue. Low fuel pressure...
Question
I have a 99 Yukon when I put it in reverse it goes forward. It has only done it twice
Hello and thank you for contacting YourMechanic. Make sure the linkage on the side of trans moves along with the shifter cable as the cable moves. If that's okay, then drop pan and check the linkage to manual valve...
Question
My code reader says I have a bad mass air flow sensor ans crank shat sensor test drive ran better shut off & engine Lt. Same code
Hi there. The problem you are describing, sounds like you may have a poor connection in the connector at the mass airflow sensor. Although, sometimes aftermarket parts do not perform as well as factory (OEM) parts. Check for corrosion and/or...
Question
My car won't go past 35mph
Hi there. From the description you provided, your vehicle has problems with the transmission again. You stated it will not shift into 3rd gear again, like before the transmission was rebuilt. If the transmission is again the problem, it should...
Question
Can my antifreeze leak be linked to my transmission problem?
Hi there. You will need to first find the coolant leak and address the leak and get it fixed. The engine may overheat and cause even more problems. The transmission or engine misfires could be from the coolant leak if...
Question
Is it possible to bypass putting a pulley back on?
Hello and thank you for contacting YourMechanic. The engine oil pump is attached to the engine behind the timing chain, so putting a pulley back on will not bypass the engine oil pump. If you are referring to the power...
Question
Brakes
If you check the brake master cylinder reservoir to see if it is low on fluid. If the fluid level is good and pedal is going to the floor still then you most likely have a bad master cylinder leaking...
Question
Putting pitman arm onthe power steering gearbox
Hello there, the power steering gearbox and pitman arm are critical steering components on your 2001 GMC Yukon. The pitman arm must be torqued properly so it sits on the splines properly preventing it from loosening over time. A regular...
Question
Changed throttle body assembly, now it won't start
Hi and thanks for contacting YourMechanic. The problem might be with the crankshaft position sensor being effected by heat. This can be verified by measuring the resistance of the crankshaft sensor with a digital volt ohm meter (DVOM) and then...
Question
P0300 code random misfire code
Hi. Several components could cause this problem - old, failing plug wires, old plugs with wide gaps, worn or corroded distributor cap or rotor contacts, failing distributor pickup coil issues, or failing ignition coil packs. Diagnosis with proper electrical testing...
Question
Why do the battery light and reduced engine power light come on at the same time?
This is likely due to a weak battery, a failing alternator or potentially a bad grounding connection. When the alternator is not working properly, it will fail to maintain an adequate charge on the battery which may cause other components...
Question
I was told my vehicle needs has a gas pedal short and need to replace a brake light switch and rewiring. How much should it be?
Hey there. The brake light switch should have nothing to do with the throttle position sensor not working properly. Check your brake light operation to determine if they are working properly, simply by having someone watch the brake lights as...
Question
I have a reduced engine power light.
Hi there. This light can come on for a number of reasons. It usually comes on when there is a voltage issue, but it will also come on when the computer finds a reason to reduce the power to protect...
Question
Pitman arm
Hello, that is hard to determine without an inspection of the vehicle. Small issues can lead to bigger ones. I recommend as soon as possible the vehicle’s front suspension should be look at completely this would include ball joints, tie...
Question
battery dies when truck is off
Hello, first need to check if the charging system is operating correctly, if tests pass the next step would be to test the battery for an internal fault such as (a short or the ability to hold a charge). If...
Question
Anti theft system causing car not to start and mechanic can't fix says take it to dealer but I don't have a lot of money
Hi there: In most cases if there is an issue with the security or anti-theft system on a vehicle that is causing the vehicle to not start it can only be repaired by the dealership for security purposes. However, it...
Question
My ABS is making a lot of noise in my GMC Yukon 2002.
Before spending the extra money on replacing the modules for the ABS and traction control, you may want to have the wheel sensors checked first as these are commonly known to either fail or become disrupted causing theses systems to...
Question
how do i get to and replace starter
Hi there: In general, the process for replacing a starter follows this method: Inspect the starter and ignition switch. Remove and replace starter if it has failed. Test for power going to starter. Inspect the starter relay, grounds,...
Question
ABS/CV axle problems after installing new axles.
Hi there. The hubs to the vehicle are designed with the harness in the middle of them for the ABS sensors. You may have installed the wrong CV axles. The replacement CV axles for the vehicle are a different design...
Question
Turn Signal, cruise, brakes, and emergency flashers not working properly.
If you have already replaced the flasher module for the turn signals, your problem may be in the switch assembly whether it is a shorted circuit or the contacts in the switch not making a proper connection and causing problems...

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