20 Most Recent 2001 GMC Sierra 2500HD Questions & Answers


Check the relay box under the hood - remove the relay related to parking lights and see if it goes out. If it does, replace the relay.

I've had these go bad in the past and get stuck in the on.


2001 GMC Sierra... | Answered on Feb 11, 2018

do a compression test to eliminate valves and valve seat insert
could be a problem hydraulic lifter causing the miss

2001 GMC Sierra... | Answered on Apr 30, 2017

if you are driving in 4wd on dry ground please dont. you will break expensive parts. 4wd is only for slippery surfaces or offroad use

2001 GMC Sierra... | Answered on Apr 14, 2017

Check alternator output against specs. I suspect that the issue is with the belt not being properly lined up with the pulleys

2001 GMC Sierra... | Answered on Apr 02, 2017

If this is an old starter then it is going out. It is not engaging with the fly wheel and that is the "running sound" you are hearing. It is also the reason that it is not starting the vehicle for you. The shaft is not coming out and engaging all of the time. Long and short of it is replace the starter and all should be good

2001 GMC Sierra... | Answered on Feb 10, 2016

It sounds like your alternator might be starting to go bad and the Battery Light is coming on because it is not charging the battery correctly. Have your Alternator checked with a volt meter, it should be reading 13 to 14 volts if working correctly. If not, replace your alternator.

2001 GMC Sierra... | Answered on Dec 11, 2015

Buy a NEW line and put it back on from where you take the old one off from

2001 GMC Sierra... | Answered on Aug 03, 2015

Read the workshop manual and it should give you the correct instructions

2001 GMC Sierra... | Answered on Aug 03, 2015

Glue the vents in

2001 GMC Sierra... | Answered on Aug 03, 2015

Put it on a TOW Truck and take it to the dealer to fix the problem. Hopefully it is the warning lights crook not what they are telling you
is wrong

2001 GMC Sierra... | Answered on Aug 03, 2015

replacing the fuel pump on this truck, requires the fuel tank to be removed. the fuel pump is installed in the fuel tank. you can either drop the fuel tank or remove the truck bed to gain access to the fuel pump

2001 GMC Sierra... | Answered on Jul 24, 2015

0996b43f80202879.jpgarrow points to front of motor

2001 GMC Sierra... | Answered on Oct 17, 2014

Cylinder 8 Misfire Detected pcm find a misfire on cylinder 8

hope it helps

2001 GMC Sierra... | Answered on Oct 14, 2014

Do you have DIC? (Driver Information Center). If you have controls on the steering wheel you can change the program to keep the headlights and the interior lights on. Maybe you can borrow an operators manual if you don,t have one. Simple procedure. Keep us posted, good luck.

2001 GMC Sierra... | Answered on Aug 23, 2014

Hi Lone Ranger,

The first link offered has information to set you up US Diesel Parts Fuel Pumps Injection Pumps and Injectors GM Duramax LB7 . Now on to the location. Here is a quick feed to watch duramax cp3 pump swap . Lets finish with this gentleman's input and contribution. Duramax cp3 high presure fuel pump removal .

This will provide a look and see distant generalization of what you may be getting into and some live experiences of those who did. Fare. Well.

2001 GMC Sierra... | Answered on Jul 27, 2014

Not finding what you are looking for?
Cars & Trucks Logo

Popular Tags

275 questions posted

Ask a Question

Usually answered in minutes!

Top GMC Experts


Level 3 Expert

85206 Answers

Jonah Oneal

Level 3 Expert

14092 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22484 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

View Most Popular

Sierra 2500HD GMC

  • Sierra 2500HD GMC

Most Popular Question

fuel gage intermittent

  • Cars & Trucks