iFixit - Answers With Device "GMC"

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

Wed, 06 May 2026 18:55:20 -0700

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

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 May 04, 2026 at 18:31 MST

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 April 15, 2026 at 14:51 MST

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 April 09, 2026 at 14:35 MST

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 April 02, 2026 at 8:03 MST

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

2015-Present GMC Yukon: Driver side mirror does not retract.

Sun, 15 Mar 2026 01:15:54 -0700

Driver side mirror does not retract?

⟐ Marked as duplicate March 15, 2026 at 1:15 MST

2000-2006 GMC Yukon: Y is my rpm in keep going high n I lose pressure

Thu, 12 Mar 2026 17:57:28 -0700

Y is my rpm going high

⟐ Commented March 12, 2026 at 17:57 MST

1988-1998 GMC Pickup: ABS cluster light is on, on my 98 gmc sierra 1500

Thu, 12 Mar 2026 13:13:19 -0700

My abs light in cluster turned on all of a sudden?

⟐ Commented March 12, 2026 at 13:13 MST

2007-2014 GMC Sierra: Transfer case stuck n neutral

Thu, 26 Feb 2026 00:23:25 -0700

Was driving stoped and truck would not move get it home screw around with 4×4 switch (knob),and it goes back into 2 wheel drive drive for 2 months, need 4 wheel have snow won't go into 4 wheel goes into auto but front wheels won't spin won't go into 2 so I drive it as is goes and yesterday day stop won't go go to put in park and it's like it's still moving and makes that grind so 30 min ago I take off the little electric motor and spin this gear,counter clock wise untill stops kinda move back drive shaft front ( trucks in neutral ) put that electric piece back in fire it up and it makes a snap,bang,clunk,but it movesso I step on gas and it shifts one time slow as hell like I am 4 low and almost like it's slipping but not put in reverse and bang but drives actually a little faster than forward

1999-2007 GMC Sierra: 2001 4.8L V8 crank/ no start

Tue, 24 Feb 2026 09:30:16 -0700

The truck has been sitting for 2 years. I have replaced the fuel, fuel pump and fuel filter. Still no start. Plugs have spark and there is pressure on the fuel rail. Any idea what may be wrong?

GMC: 2008 GMC Sierra 1500 - Runs good then quits

Sun, 01 Feb 2026 11:30:41 -0700

truck runs then quits after a few min truck starts again

⟐ Commented February 01, 2026 at 11:30 MST

2006-2014 GMC Yukon: Why is my airbag light on?

Tue, 13 Jan 2026 06:22:09 -0700

airbag light came on...scanned it came back with a B0020 code that says passenger frontal deployment loop stage 2 short to ground (symptom 02) - current dtc, history dtc, test not passed since power up, warning indicator requested.

GMC Savana: Why am I getting no start after distributor replacement?

Tue, 30 Dec 2025 08:55:05 -0700

My distributor is replaced I've done the whole 180 if it was done wrong put it back at the 99 3500 Savannah with a 7.4 and now it just cranks but no start after I replaced the distributor and I have plenty of fuel pressure

2015-Present GMC Yukon: Power lift gate only partially opening

Mon, 29 Dec 2025 14:49:41 -0700

Rear hatch not opening all the way

2007-2014 GMC Sierra: 5.3 brand new everything been replaced run rich

Fri, 26 Dec 2025 11:49:12 -0700

Replaced a brand new motor 5.3 crate everything’s been replaced on the motor as well and fuel pump still having run rich bank one bank too can’t figure it out. Doesn’t smell rich. Doesn’t feel like it’s running rich, but code keeps popping any help would be greatly appreciated. All new sensors as well.

1988-1998 GMC Pickup: How to change door handles inside

Fri, 26 Dec 2025 00:42:13 -0700

How to replace a door handle on the inside with electric windows

⟐ Commented December 26, 2025 at 0:42 MST

2007-2014 GMC Sierra: Ground for evaporator plug

Tue, 23 Dec 2025 10:31:01 -0700

My check engine light is on. Says ground wire evaporator. What is broken.

⟐ Commented December 23, 2025 at 10:31 MST