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Questions tagged [gmc]

A division of General Motors which produces trucks, buses, vans, and other large vehicles.

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10
votes
1answer
660 views

semi loud growling noise at all speeds

I have a 1998 GMC Sonoma SLS with a 4.3 l V6 Vortec. It used to purr, now it growls, sounds like a small diesel engine. Vibration can be felt (mostly in the dead pedal) and also vibrates/growls in ...
9
votes
0answers
390 views

Torque convertor shudder? [closed]

I drive a 2011 GMC Sierra 2500HD ex-cab 2wheel drive with a 6.0 gas engine and a six speed 6L90 automatic transmission. I have started noticing what I believe is called "shudder" from my tranny under ...
8
votes
1answer
203 views

04 GMC Savanna G2500 4.8 V8 No Power

First time I looked at this the A/C compressor clutch wasn't engaging. Long story short: the high side pressure switch on the back of the compressor was unplugged. Noted that the engine was shaking (...
8
votes
1answer
73k views

My rpms are going high and my mph take a minute to go higher on my GMC Yukon

When I put my truck in drive and step on the gas the RPM's go up to 3,000 but my MPH will stay at 10-15 When I let go of the gas a little bit I can feel the truck kind of pull and the RPM's will go ...
7
votes
3answers
7k views

How do I fix my Heater & A/C in my car, suspect vacuum problem?

I didn't see this question asked after a search so I thought why not. I have a 97 GMC Sonoma with 90k miles that I barely drive. Since the hot summer is coming fast I went to use the AC and I am ...
7
votes
1answer
5k views

Coolant pouring out from under 1998 GMC Yukon as fast as i put in

I filled my radiator with water and it is pouring right back out of the rear of engine as fast as i fill. It seems to be near or behind the transmission. https://youtu.be/27qV-ufMsQc How can I find ...
7
votes
1answer
615 views

My car will not start after being driven fine

I have a 2003 gmc envoy xl it has been running fine..drove it all day. Went home 4 hrs later it will not start.. It acts like it is dead but everything from the lights to the heat works fine..I mean ...
6
votes
1answer
10k views

What does this symbol on my dash mean? GMC W4500

The light can be switched on or off by operation of the stem on the right of the steering wheel, the same control that operates the windshield wipers. I can't detect any difference whether it is on ...
6
votes
1answer
2k views

Are automakers required to maintain spare parts infrastructure for 15 years?

Are (U.S.) automakers required to maintain an infrastructure of spare parts for 15-years (in the U.S. or in California)? Reading about the GM EV-1: The EV1's discontinuation ... to avoid potential ...
6
votes
1answer
312 views

What is causing this slight vibration?

I have a 2004 GMC Envoy 4WD with a clean title, 54k miles. Very good condition. I recently purchased my second set of tires, Pirelli Scorpion ATRs. They are solid and quiet, but after changing them ...
5
votes
2answers
13k views

Why do you have to replace brake pads on both rear wheels at same time?

I have a 2002 GMC Yukon 1500XL. The right rear brake caliper went bad because of a torn rubber boot, which caused the brake pads on that wheel to wear out really quickly. I replaced the caliper, rotor ...
5
votes
2answers
25k views

Driving in 3rd gear what will it do to the transmission

My daughter drove her pickup in 3rd gear on the highway. Will it damage the transmission?
5
votes
5answers
104k views

Random RPM jump when accelerating hard

I should state first off that I'm not much of a car guy when it comes to the actual mechanics behind them. I just wanted to check if there's anything going wrong with my transmission. I drive a 03 ...
5
votes
2answers
3k views

Truck overheating; no coolant flow through radiator

I have a 95 GMC Sierra 5.7 it suddenly overheated one day and the upper radiator hose busted. So far I've changed upper and lower hoses thermostat and water pump and flushed radiator. All new parts ...
5
votes
1answer
102 views

Odd yellow electrical connector (GM)

I'm trying to pull an instrument panel in a 2000 GM Jimmy. There is this odd electrical connector I've never seen before. I can't squeeze the retention ramp to disconnect the thing. It has an odd ...
5
votes
2answers
1k views

Block Test: Can't suck any more air, is this normal? (1999 Suburban)

I performed a block test recently to diagnose a problem I'm having. The liquid stayed blue, but I want to clarify I have done this right. The purpose of the test was to see if I could prove a head ...
4
votes
2answers
261 views

What did I break and what do I need to replace?

My car slid and went over a center divider. I am very new to auto repair, but am wanting to learn and do it myself. Sadly, I am not very familiar with the parts so I can't really say what broke other ...
4
votes
2answers
3k views

Trouble rewiring O2 sensor harness after dogs ate it

This is a 2005 GMC Yukon 4x4 4.8 L. Ok, dogs actually ate my harness going to Bank 2 Sensor 1 O2 sensor. The connector from the body side of the wiring is completely gone. I found a connector I can ...
4
votes
1answer
138 views

2015 GMC truck check engine light no longer on

Had my check engine light on. Put a code reader on it to see what it was. It went off on its own a few days later. Went to dealership and told them what the code reader said it was before it went ...
4
votes
1answer
669 views

Truck won't budge in neutral. Could it be due to a cracked transmission bellhousing?

1997 GMC Sierra K1500 4x4 5.7L V8 Automatic Transmission (4l60e I believe) I pushed my truck up my driveway with another truck. My truck was very hard to move, even in neutral and with the parking ...
4
votes
1answer
571 views

1998 GMC Suburban Air Conditioner

I am a part time auto mechanic, and for the life of me cannot figure out this problem. No matter how many times I fix it, two weeks later it comes back. I cannot fix the air conditioner. I have ...
4
votes
1answer
3k views

2003 Yukon XL 1500 5.3L Very rough, unstable idle on cold starts

When I say rough I mean like bad 70s carbureted motor rough. I've never seen an injected motor this rough during warm up. On the coldest days, it can even die out on me. The problem has only popped up ...
4
votes
2answers
13k views

What is the correct/factory wiring for a Suburban 1998 battery/alternator?

I have included a picture showing what I have now on this Suburban. Note that there is wiring not shown in the picture which is a second electrical connection to the positive side of the battery ...
4
votes
1answer
1k views

Where does a distributor gets it's power from?

I have a 1996 GMC K2500 Suburban with a 7.4 liter engine not getting power. Where does the distributor get it's power from?
4
votes
1answer
27 views

1994 GMC Rally 3500 Low Beam out, High beam works intermittently

Low beam doesn't work. High beam will work, but cuts off and then on again. Also, if related, the switch must be jiggled for the interior dash lights to work. Could all of the problem be in the switch?...
4
votes
1answer
802 views

Coolant leaking into engine

I had my truck in for service - 2006 Sierra Denali - due to an oil leak. They replaced the "engine oil cooler lines to pan gasket". Within a couple of days had a major issue - coolant had gotten into ...
4
votes
1answer
4k views

2004 GMC Yukon Denali, intermittent no crank/no start/no noise

OK, it started doing this a few months back with no rhyme or reason. Before this happened, sometimes would start beeping after engine start. A long 18 beep procession. Don't know if related. When ...
4
votes
0answers
140 views

New LED 3rd brake light stops working

Swapped out LED taillights and third brake light on my '05 Sierra. Tail lights work fine but the third brake light will work when first plugged in but after a short while the cab lights don't work.
4
votes
2answers
580 views

1999 jimmy with no heat in the cab

I have a 1999 gmc jimmy 4.3 L V6. I recently bought this truck and have had some minor problems with it but that is expected for the year. Lately the weather is starting to get colder. 0 Celsius over ...
3
votes
2answers
145 views

How do I determine whether this vehicle has a turbocharger?

This is a 1999 Suburban, which did not have any aftermarket turbocharger installed. So, the only way it could have been installed is from the factory. So, how do I find out whether it has one? What ...
3
votes
1answer
763 views

2007 Yukon XL issues in four wheel drive

This truck is a nightmare. Every time we drive it, something breaks. We had it in the shop about a month ago because all of the gas lines were rusted out and leaking. While it was there, they also ...
3
votes
2answers
10k views

Can I put 225/75R16 on a vehicle meant for 245/75R16?

I have a retired 2000 GMC Savanna 250 with 225/75R16 tires that have plenty of tread, no signs of dry rot, and are only 3 years old. My newer vehicle is a 2009 Ford E350 extended, and it needs at ...
3
votes
3answers
169 views

If the engine starts and keeps running, is my fuel pump okay?

I have an '06 GMC Canyon and I had it not starting in a parking lot last night. The starter was turning, but the engine would never actually turn over and start. There was an old timer that came by ...
3
votes
2answers
3k views

02' GMC Envoy. Engine KNOCK, not rod knock

I have a 2002 GMC Envoy. Last year it developed a knocking that was at a very low volume but became louder in a 2 week span. After that it's been the same, it's louder when the engine starts cold and ...
3
votes
1answer
1k views

My Reverse Just Went Out/Everything Else Is Fine

I have a 2001 GMC 2500HD automatic 6.0 Vortec and the reverse just quit. All the other gears work fine. Where can I find a video that shows how to solve this?
3
votes
2answers
311 views

2003 Yukon 5.3 with 278,000

At 70 mph and about 2000 rpm, I have noticed that when i lightly press on the accelerator, the rpm will rise but speed will not increase. i press a little harder and the rpm will come back down to ...
3
votes
2answers
1k views

Van won't start and no lights come on; battery good

I have a 1992 GMC Vandura 2500 5.7L. A few weeks ago, I tried to start it. All lights and radio came on but it wouldn't start. I tried again a week after that to show my dad but it still wouldn't ...
3
votes
1answer
1k views

Positive cable smoking…

I have a question. My truck has the battery next to the frame. Positive is almost impossible to get to. There is a positive red box in the engine to connect the positive jumper cable to. I had a dead ...
3
votes
1answer
1k views

How or where to determine/find the pinout for the Canyon ABS pump (545-00579)

I am trying to connect to an ABS pump taken from a 2012 GMC Canyon interchange part number: 545-00579. Since this is not an aftermarket part, ATE the manufacturer of the controller hasn't been ...
3
votes
2answers
4k views

Z71 package details for old body style, late 1990s, GMC Sierra

For GMC Sierra pickup trucks back in the old-body style late 1990s (1996, 1997, 1998) (not the new-body-style and more recent from 1999 onwards), what features made up the Z71 package? I always ...
3
votes
1answer
191 views

6L90 Transmission swap

I'm swapping out a worn out 6L90 transmission that has over 220k on it in a 2011 GMC 2500 HD with one that has 89k on it from an identical truck. Will it have to be reflashed or reprogrammed to work?
3
votes
1answer
530 views

Check engine light between 1300-1800 RPM

I have a 1995 gmc Sierra hd with the 6.5L turbo Diesel engine in it. I just recently bought it and when ever I hold around 1300-1800 rpm the check engine light comes on, when I take my foot off the ...
3
votes
1answer
431 views

Satellite Radio OEM location on an 2009 Acadia

Does anyone know how to get at the XM unit on an '09 GMC Acadia? I can see the unit. It's located on the inside of the trunk, above the rear, driver-side tire. However, there's a large, black piece ...
3
votes
1answer
167 views

2008 GMC Yukon 5.3L engine vibration at low speeds with cylinder deactivation

I have a 2008 gmc yukon 5.3L that has developed an engine vibration at low speeds with cylinder deactivation like when coming to a stop. Does not vibrate while normal low speed cruising but when ...
3
votes
0answers
18 views

No start on 2002 GMC Savanna 1500

When I try to start it it will not start I was told to push the gas and it doesn't do anything at all. I replaced the alternator and got a new battery. We have been having this problem for over a ...
3
votes
0answers
69 views

1987 GMC Sierra - Can't connect to OBD diagnostic connector

I own a 1987 GMC Sierra and it has an ECU, I took it to a workshop to see if I've any issues, when they tried to connect a diagnostic reader to the connector (underneath the steering wheel) they ...
3
votes
0answers
69 views

Changed front brake pads on 06 GMC Z71, then the master cylinder and brake booster failed [closed]

I put new brake pads on the front of my 06 GMC Z71. After finishing, I noticed I didn't have any brakes. The peddle was spongy so I bled the brakes. And bled the brakes, and bled the brakes. I could ...
3
votes
2answers
609 views

2007 GMC Sierra Rod Assembly for the Spare Tire

We recently purchased a 2007 GMC Sierra and are looking for some details on the assembly for the spare tire. The truck did not come with the rod assembly for the spare tire and we were hoping to make ...
2
votes
3answers
830 views

different tire ratios

I have a 2006 GMC Sierra 1500 extended cab 4x2. I have 4 extremely worn tires. We are traveling from Texas panhandle to Carlsbad NM so I need to replace them. The problem is I can only afford used ...
2
votes
3answers
234 views

12V power disappears, inexplicably comes back when measuring voltage across battery terminals

Lately, my car has ocasionally had an issue where it completely goes black, no lights, no power windows, no cigarette lighter, and obviously no ability to start the engine; cant even get the solenoid ...