iFixit - Answers With Device "GMC Sierra"

1988-1998 GMC Pickup: Locate vacuum hose by transmission

Sun, 10 Aug 2025 15:30:42 -0700

Locate vacuum line to transmission

⟐ Commented August 10, 2025 at 15:30 MST

1988-1998 GMC Pickup: Looking for drain plug on radiator

Tue, 16 Feb 2021 15:31:04 -0700

Looking for drain plug for 98 sierra. Can someone help with the location, if there is one?

⟐ Commented February 16, 2021 at 15:31 MST

1988-1998 GMC Pickup: Where is the speed sensor?

Mon, 02 Oct 2023 21:16:54 -0700

My 1992 3/4 ton truck 4 wheel drive is throwing a code, 24 speed sensor failure, where do I find this sensor?

⟐ Commented October 02, 2023 at 21:16 MST

1988-1998 GMC Pickup: wiring problems with turn signals and running lights,.

Tue, 10 Dec 2019 10:36:40 -0700

I have a 1998 GMC Sonoma pickup that has been sitting for 1 1/2 years. left turn signal blinks rapidly while right TS is ok. If I put on running lights, both turn signals blink rapidly. and the taillights blink strange and then stop all together. The license plate lights were also blinking, I removed the bulbs and taillights still the same. inspected under the rear of the truck and found nothing disturbed. Changed electronic flasher and no changes. If running lights are off, right turn signals operate normally, but left side blinks rapidly. Suspect a ground problem, but ground on rear of frame look good and connected.

⟐ Answered December 10, 2019 at 10:36 MST

1988-1998 GMC Pickup: Transmission will only work in low & reverse?

Sat, 28 Jul 2018 14:10:16 -0700

88' gmc, 700r4 transmission won't shift from low to drive.fluid is good. Reverse works. Any ideas?

⟐ Answered July 28, 2018 at 14:10 MST

2007-2014 GMC Sierra: Why do I have power but wont crank or turn over

Sun, 27 Jul 2025 23:54:28 -0700

Why do I have power but vehicle wont crank or turn over

⟐ Answered July 27, 2025 at 23:54 MST

1988-1998 GMC Pickup: Misses like it's drawing moisture.

Sat, 05 Mar 2016 11:45:37 -0700

This is on a '97 GMC Sierra. I'll give it a complete tune up and in about three to four months it starts doing it again. I've been around and worked on vehicles most of my life and this has me puzzled. I have heard it could be anything from the computer to the coil or even a bare wire. I hate to keep changing everything every couple of months, and, besides, I can't afford it.

⟐ Answered March 05, 2016 at 11:45 MST

1988-1998 GMC Pickup: My oil filter busted

Thu, 05 Dec 2019 17:06:32 -0700

I started hearing this ticking noise in my engine and my truck died i looked under the truck and my oil shot from my oil filter to my gas tank.

⟐ Commented December 05, 2019 at 17:06 MST

1988-1998 GMC Pickup: Rear running lights do not work?

Mon, 02 Feb 2026 06:36:03 -0700

The rear running lights do not work on my 94 GMC Sierra . My turn signals and hazards are fine. and brake lights work when I hit pedal , but my tail lights that stay lit while driving do not work and I have changed the bulbs already and no fuse is blown. Any suggestions?

⟐ Commented February 02, 2026 at 6:36 MST

2007-2014 GMC Sierra: water pump how to change

Sun, 03 Aug 2025 10:10:08 -0700

water pump replace

How to water pump change

⟐ Answered August 03, 2025 at 10:10 MST

2007-2014 GMC Sierra: Why do my speakers only work sometimes?

Sun, 16 Jul 2023 14:10:43 -0700

My truck’s passenger speaker has been going in and out. Today however, my drivers side has gone out as well. My rear speakers have never worked. I don’t know if it is a speaker issue or if it is a wiring issue. Any ideas?

⟐ Commented July 16, 2023 at 14:10 MST

2007-2014 GMC Sierra: Oil pressure sensor location

Fri, 21 Jan 2022 01:51:06 -0700

Where is oil pressure sensor on v8 5.3

⟐ Answered January 21, 2022 at 1:51 MST

1988-1998 GMC Pickup: Changed steering column and now wont crank?

Fri, 19 Oct 2018 06:41:42 -0700

What are the electrical plugs at the base of the steering column?

⟐ Commented October 19, 2018 at 6:41 MST

1999-2007 GMC Sierra: Truck is cutting out at acceleration

Sun, 16 Jun 2024 12:03:21 -0700

Truck runs fine and slow acceleration but when I go to get on the highway or pick speed back up it cuts in out on me

⟐ Commented June 16, 2024 at 12:03 MST

1988-1998 GMC Pickup: 94 gmc 1500 Brake light wire cut at rear harness

Tue, 05 Sep 2023 14:46:40 -0700

I found the brake light wire and its cut just before the rear harness. But I can't find the other end(where it would connect to harness or another wire). All other lights work fine. I know it works with turn signal lights but how are they connected. Wire harness (by this I mean the 4 wire plug under rear of bed doesn't have a opening for the brake wire which is the 5th wire that runs along the chassis with the turn,back up,and running lights.please help before I set on fire.

⟐ Answered September 05, 2023 at 14:46 MST

1988-1998 GMC Pickup: will not turn over, got lights radio,etc

Sun, 16 Apr 2023 10:27:32 -0700

1992 gmc serria pickup turn key on got lights, etc. will not turn over

⟐ Commented April 16, 2023 at 10:27 MST

1999-2007 GMC Sierra: What gmc truck years have interchangable parts with a 2005 gmc sierra

Fri, 03 Mar 2023 10:31:39 -0700

what gmc truck parts are interchangable with a 2005 gmc sierra 1500 4/4

⟐ Answered March 03, 2023 at 10:31 MST

1999-2007 GMC Sierra: What gmc truck has interchangeable parts with my 2002 gmc sierra 1500?

Sat, 07 Mar 2026 21:26:21 -0700

What parts and frame on my 2004 Chevy tahoe fit my 2002 gmc.Sierra 1500 ?

⟐ Answered March 07, 2026 at 21:26 MST

1988-1998 GMC Pickup: Why dont my brake light/turn signals work on 1995 gmc sierra 1500?

Sun, 01 Feb 2026 10:47:50 -0700

My reverse lights, brake lightand turn signals do not work. Running lights do. My 3rd brake light(on the cab) does work though. Fuses are good, relay seems good, new tail light bulbs and circuit boards still no fix.

⟐ Commented February 01, 2026 at 10:47 MST

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

Thu, 22 Aug 2024 14:55:20 -0700

Automatic running board driver side is not working properly

⟐ Commented August 22, 2024 at 14:55 MST