Question about 2003 GMC Sierra 2500HD

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I have a 03 gmc 2500 hd im having headlight problems but only sometimes and only when i have to high beams on and I have to switch to low beams the low beams don't come except when you hit a bump in the road then the low beams come on and the high beams always work

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  • GMC Master
  • 76,630 Answers

Replace the headlight dimmer switch on the steering column and check the connector to it fro signs of overheating, replace connector and switch as one repair. Do not use crimp connectors, solder all wires as needed and use shrink tube to insult the solder joints.

Posted on Feb 22, 2012

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Posted on Jan 02, 2017

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  • 40 Answers

SOURCE: 2003 gmc 2500 hd turn key nothing happends

try checking your neutral safety switch.

Posted on Apr 15, 2009

  • 124 Answers

SOURCE: where is the 4x4 encoder motor sensor located on my 03 sierra

the encoder motor sensor is inside the encoder motor. the encoder is located at the transfer case. Remove the encoder and by part number 88962315 this is the sensor. you will have to retime the motor after
hope this helps

Posted on May 06, 2009

Mr BrokRench
  • 1623 Answers

SOURCE: highbeam headlights work but no low beam, it is not the switch........?

Check voltage at the circuit box and test the high/low dimmer switch. Corrosion on a ground wire could also be the problem.

Posted on May 19, 2009

centralvalle
  • 386 Answers

SOURCE: Both low beam headlights on my 05 GMC envoy do not

Check your headlamp relays under the hood, should be located on either the L/H or R/H fender well , could be inside a black plastic box labled fuses and relays... there will be a label on the underside of the lid to this box locate the relays as per lables... please rate my help thanks...

Posted on Aug 06, 2009

ftw1952
  • 10319 Answers

SOURCE: 2003 gmc 2500 hd..horn doesn't work

The horn pad is made of vinyl which contracts through the four seasons causing this problem for some. Remove the horn pad with the battery disconnected first of all. Use a jumper wire to see if the horn works. If id does check the horn relay next. If ok hot wire the horn direct. One should be your problem or it is a broken wire instead

Posted on Apr 04, 2010

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1 Answer

2002 gmc envoy has no low beam headlight both.is the problem would be a headlight switch.how to replace a headlight switch..thank you..;.


it might only be a blown fuse, check the fuses in the fuse box, HIGH & LOW beams usually have their own fuses.....hope this helps......cheers.

Sep 24, 2011 | GMC Envoy Cars & Trucks

1 Answer

1998 GMC Sierra has running lights and high beams but no low beams. Headlight switch is not the problem


first off, be sure your low beams aren't both burned out. it happens all the time. next check your dimmer switch operation. (i'm betting on low beams burned out) good luck.

Dec 21, 2010 | 1998 GMC Sierra

1 Answer

Low beams stopped working high beams work fine


Either both bulbs are bad(I've seen it before) or your
dimmer/headlight switch is bad. If you can without pulling the bulb, pull plug from the light. If it's a 4 lamp system pull the low beam. Do this on the left side as the right feeds from the left. With a 12v test light, check for power. (with lo beam on) if you have
power, change the lamp, if you don't it's most likly
the dimmer switch at the steering collum.
Hope this helps Good luck

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2 Answers

My low beam lights sometimes stop working i still have high beam and daylight runing lights after a while they come on.2009 elantra dealer can't find problem.


when the low beams quit try switching from high to low and back and see if low beams stay on, if they do it may be the dimmer switch, if that doesn't change anything suspect the headlight switch.

Sep 02, 2009 | 2009 Hyundai Elantra

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I have no headlights!! parking lights, taillights,and blinkers all work fine. none of my fuses or bulbs are blown


I have a 2004 ram 2500 and all my lights work except for low beams. It is not in the switch, I haver replaced the switch with no change. This is a circuit problem with these dodge pickups. I haven't firgured out what it is but it isn't the switch. and unless the low beams and high beams are fused seperate, it isn't a fuse problem either. i have looked for a fuse and can't even find the fuse for the headlights. Im lost like you!

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1 Answer

Highbeam headlights work but no low beam, it is not the switch........?


Check voltage at the circuit box and test the high/low dimmer switch. Corrosion on a ground wire could also be the problem.

May 19, 2009 | 1993 GMC Sierra K1500

2 Answers

What would cause both low beam headlights to go out at the same time? i have replaced the headlights and they still dont work.


The headlight high/low beam switch assembly.96 Safari has the turn signal stem as the high/low beam switch.Removal of the steering wheel is necessary to get to the switch assembly for replacement.

Jul 13, 2008 | 1996 GMC Safari

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