20 Most Recent 2001 GMC Yukon XL Questions & Answers

Which O2 sensors came out of the vehicle an which did you put back in ? Two different types for that vehicle. DTC P0134 or P0154 (w/LR4 and LM7 w/ Delphi HO2S) DTC P0134 or P0154 (w/LR4 and LM7 w/ Denso HO2S) DTC P0134 or P0154 (w/LQ4 w/Denso HO2S)

There are 4 things that could be the cause, the switch, the module, the encoder motor on the transfer case or a problem with the Antilock Brake System [ this is how the auto 4wd system gets it's operational infomation ]. The only realistic way to pinpoint the problem is to scan the 4wd system with a good scanner.

faulty water pump ?are you sure the cooling system is full of coolant and has no air pockets ?how long does it run before it overheats, and what does the gauge say when it does ?

sounds like the starter motor is jammed or shorting get someone to turn the ignition to start and at same time hit starter motor, if this does not work, put vehicle in gear and rock back and forth, this hopefully will release a stuck starter, if it is auto you obviusly cant do that, you can try attatching wires directly from your battery to the starter motor ie live to the red connector earth anywhere on the starter(not on the live terminal) and see how that works...hope that helps

Question edited for clarity, full 'year maker model'. Question moved to sub category. There are at least two fuses that mention it.

GMC Yukon (2000 - 2001) - fuse box diagram - Auto Genius

https://www.autogenius.info > gmc-yukon-2000-2001-f... Jan 1, 2017 - The underhood fuse/relay center is located in the rear of the engine compartment near the brake fluid reservoir. ... WARNING: Terminal and harness . ..

A mechanic would check for voltage at the starter, the neutral safety switch, and the key switch. Then check the battery cables and ground connections.

Replace the blower motor resistor located in the blower housing under the dash on the passenger side and you will be good to go.

Yes input and output sensors

By cycling the key and it starting, I would suspect the fuel pump. Sounds like low pressure.

Yes I think there is a problem in radio or in cigarette plug check if the fuse are the same for both

check VEH STOP fuse in the instrument panel fuse box. If good, check for battery voltage in the bulb connector on the light blue wire with lights on. If no voltage, check for voltage in the rear junction box. Pull connector 4 and check for voltage on the terminal that connects to the light blue wire. If not voltage, you'll have to check the harness between the rear junction block and the underhood fuse block

If they sound like they are trying to do something it's not the lock out switch . But to be sure pulling out the switch an testing for B+ voltage to and from the switch . Plus pull the other door switches to see if they have B+ voltage and good grounds would be the thing to do.. If you don't know how to check automotive electrical circuits your best bet , take it to a qualified repair shop . Passenger Power Window Operation The passenger power window switches incorporate window up and down relays. The relay coil feed and supply sides are powered through the RAP fuse supply voltage circuit. The normally closed contacts of each relay is connected to ground. The load side of each of the relays are connected to either side of the power window motor through the power window up and down circuits. The up and down relay control circuits are connected to the normally closed contacts of the passenger window switch. These contacts are wired in series with the power window master switch, through the power window master switch up and down signal circuits and then to ground when the power window master is placed in the up or down position. This allows for the up and down operation of the passenger power window from the power window master switch. The center pole of the passenger power window switch is also connected to ground and will energize the relay when placed in the up or down position. Driver Power Window Operation The driver power window is unique from the passenger power windows in that it does not use window up and down relays. The driver power window is operated directly from the power window switch. The normally closed contacts of the switch are connected to ground and the center pole is connected to the RAP fuse supply voltage circuit. By placing the left power window switch in the down position, voltage is applied to the power window motor left front down circuit and to the power window motor. The other side of the power window motor is connected to ground through the normally closed contacts of the left power window switch through the power window motor left front up circuit and drives the window down. By placing the left power window switch in the up position the polarity of the motor is reversed and the motor drives the window up. Has circuit breaker for B+ power • PWR WDO CB 25A (fuse block) (System power for left and right windows 2-door vehicles. System power for LF and LR windows 4-door vehicles) • PWR WDO CB 25A (IP wiring harness junction block) (System power for RF and RR windows 4-door vehicles) Could be passenger door switch .

I was having a clicking noise from a actuator under the dash of my car, it was a blend actuator.. Years ago they used cable then vacuum hose and now a lot of vehicle us actuators (motor driven gate) to open and close the vents, A/C and heater ducts. I do not know for sure that is your problem but when mine went bad I would get a clicking noise sometimes it click for a few seconds after I turned the car off. Just a thought.

Hey M, the pressure could be nothing but "hot air" and not freon... (I had this same problem!!) I let off a bunch of pressure..(nothing but clear hot air!!) ..using a small flat punch..on the low pressure side... if freon on comes out right away..stop.. if nothing but hot air comes out.. keep letting it out until freon comes out,,, When mine started letting out freon,, I quit and tried the A/C again... and it has been working fine since.. Just my recent experience!!!!

Take it to a reputable trans shop. These transmissions are controlled by a computer. If this is a 2500 or 3500 Yukon, I bet it is equipped with the 4L80E transmission. These have a tendency to allow transmission fluid into the large electrical connector, and it shorts out wires and can make things go crazy. There is a way to silicone the leak and fix it(videos on YouTube) or a good honest shop can do it without replacing parts.

Contact this company, they are the go to pro's on car and truck audio. crutchfield.com