iFixit - Answers With Device "GMC"

2006-2014 GMC Yukon: How do I fix a p0420 code

Fri, 29 May 2026 09:05:43 -0700

How do I fix a p0420 code

2014-Present GMC Sierra: How do you replace the AC condenser?

Tue, 26 May 2026 06:30:01 -0700

How do you replace the AC condenser?

⟐ Answered 五月 26, 2026 at 6:30 GMT-7

2000-2006 GMC Yukon: Why does my brake pedal go to the floor when the engine is running but

Tue, 26 May 2026 06:02:02 -0700

when the engine is running, my brake pedal goes to the floor. when engine is off, I can pump up the brakes somewhat. I have changed the master cylinder and there is no fluid leak. Could the problem be with the power assist boost, or is there something else that could be the issue?

⟐ Commented 五月 26, 2026 at 6:02 GMT-7

2000-2006 GMC Yukon: يظهر صوت مزعج عندما اضع المحرك على وضعية القيادة

Sat, 23 May 2026 20:44:03 -0700

صوت طقه اذا عشقت d

⟐ Commented 五月 23, 2026 at 20:44 GMT-7

2015-Present GMC Yukon: My A/C is going from hot to cold and back A/C no longer blows

Sun, 17 May 2026 18:40:49 -0700

I drive a 2015 Yukon SLT

So I just started having an issue or my AC is blowing cold, but then starts to blow warm, but then starts to blow cold again. I noticed my cooling fans only work when my AC is on, but never engages to the high speed. It should after reaching a certain temperature. I had someone use a scanner to automatically turn on the fans to high and they do work but at the same time this happens my back, A/C doesn’t blow at all no air comes out. I change the sensor that’s on the line. No change. The guy who scanned it said he was getting a bunch of HVAC issues. But also got a code that said no communication with the Telematic control module. He said that could be the issue that’s causing the fan to not turn on high and for the back fan not to work at all but everything I’ve seen online says there’s no correlation. I don’t wanna buy the module if there’s no correlation any help would be great.

⟐ Commented 五月 17, 2026 at 18:40 GMT-7

1988-1998 GMC Pickup: What makes the 700r4 tranny just start slipping and loosing all high g

Sat, 09 May 2026 00:16:28 -0700

Only reverse and first and half of second gear work and second gear catches and releases

⟐ Answered 五月 09, 2026 at 0:16 GMT-7

1988-1998 GMC Pickup: Porque tiene hard time starting

Mon, 04 May 2026 18:31:34 -0700

Mi chevy Silverado has a hard time starting

⟐ Commented 五月 04, 2026 at 18:31 GMT-7

2015-Present GMC Yukon: Windshield washer not working

Sat, 25 Apr 2026 21:54:23 -0700

Windshield washer not working

⟐ Answered 四月 25, 2026 at 21:54 GMT-7

2014-Present GMC Sierra: Automatic running board not working how ti fix it?

Sat, 25 Apr 2026 18:59:40 -0700

Automatic running board driver side is not working properly

⟐ Answered 四月 25, 2026 at 18:59 GMT-7

1999-2007 GMC Sierra: What causes all the clusters in a dash not to work and fuse is not blo

Sun, 19 Apr 2026 15:16:42 -0700

What is my gauges and my speedometer not working the truck and you can't start it by the key you have to pop the hood and start by solenoid

⟐ Answered 四月 19, 2026 at 15:16 GMT-7

2006-2014 GMC Yukon: 2007 Yukon 1500XL Engine Light

Sat, 18 Apr 2026 14:54:19 -0700

2007 GMC Yukon Denali 1500XL AWD
6.2L V8
187k miles

Been having some engine issues.
Replaced all 8 spark plugs, wires, coils.

Now at idle, no significant shaking.
Fuel System 1 and 2 status move to OL-Fault after a minute or so
Then traction control and stability lights come on
Followed by flashing check engine - P0300 multiple misfires

Check each cylinder report - 0 misfires on all

Get the RPMs to 2000 and the Fuel status 1 and 2 both go to CL.
The engine light goes away
The traction and stability lights go away

Drives fine. No noticeable issues other than the beeping an annoying flashing lights.

Issue seems to be air intake or fuel mix or sensors.

Short term fuel trim stays at 0.0% until the RPMs are up. Open loop fault?

O2 sensors seem sluggish - move between 0.9v and 0.2v.

MAF 0.78 to 0.83 pounds/min at idle
MAF 2.5 pounds/min at 2000 RPM

All the problems are at idle. I cleaned the throttle body, added fuel, did a battery reset. What else?

I threw all this into AI and it says I need to replace the front two O2 sensors. But what do humans think?

GMC: Changing out a crankshaft sensor

Wed, 15 Apr 2026 14:51:39 -0700

How do I replace the crankshaft sensor on my 2018 GMC canyon

⟐ Commented 四月 15, 2026 at 14:51 GMT-7

2014-Present GMC Sierra: stuck in 4 wheel drive

Sat, 11 Apr 2026 18:29:28 -0700

My truck is stuck in 4 wheel drive how can I fix this?

1988-1998 GMC Pickup: Transmission will not change gears

Thu, 09 Apr 2026 14:35:18 -0700

Transmission will not change gears

⟐ Commented 四月 09, 2026 at 14:35 GMT-7

1999-2007 GMC Sierra: Cruise control not working, 2006 Duramax

Wed, 08 Apr 2026 00:14:58 -0700

Cruise control not working,,what can I check ?

On a 2006 Duramax,,

⟐ Commented 四月 08, 2026 at 0:14 GMT-7

2015-Present GMC Yukon: How to replace switch on driver side seat on a 2016 Yukon

Thu, 02 Apr 2026 08:03:49 -0700

How to replace the switch on the driver side seat

⟐ Marked as duplicate 四月 02, 2026 at 8:03 GMT-7

GMC: How to replace the power switch on a driver side seat

Thu, 02 Apr 2026 08:03:49 -0700

The seat adjustment, Control how do you replace it?

⟐ Marked as duplicate 四月 02, 2026 at 8:03 GMT-7

2014-Present GMC Sierra: 2018 Denali window controls not working

Tue, 24 Mar 2026 19:30:14 -0700

Drivers door switches wont control window functions on passenger and rear windows but operate drivers front window. Also mirror controls dont work

1999-2007 GMC Sierra: Why is hot air being forced out of defrosters when a/c is turned on?

Sun, 15 Mar 2026 20:27:25 -0700

Driver's side and rear has cold air but passenger side is hot air. and the defrosters are blowing out hot air even when the settings for windshield are off.

⟐ Commented 三月 15, 2026 at 20:27 GMT-7

2006-2014 GMC Yukon: How do I fix my driver side retractable mirror? Motor runs but doesn’

Sun, 15 Mar 2026 01:17:57 -0700

Driver side retractable mirror does not work. Motor is working but no retraction.

⟐ Commented 三月 15, 2026 at 1:17 GMT-7