GMC Cars & Trucks - Recent Questions, Troubleshooting & Support

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2003 envoy low beams will not work.fuses

For the I6 engine there is a relay for low beams, it's relay # 46. Switch it with relay #45 (runs the fan, same model relay) and see if your lights now come on. These 2 relays are the only 2 black ones in there (part # 15016745). Also, try to clean the contacts very well on the fuse box and the relay. If not, you may have some frayed wiring in the harness.

By the way, the high beam relay is #43, the gray one next to the windshield wiper relay #42.frontfuses.jpg
8/16/2022 10:54:28 AM • 2003 GMC Envoy • Answered 1 hour ago
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What transmission will interchange with a 1991 2 wheel drive gmc sierra

know what RP0 means get that and trans name is in the 3 digit code. All GMs have it and we look that up first. (easy to find parts for GM cars or trucks RPO code list) which one is there now, be a start. lots of versions used then. automatic or stick shift manual, OOPS> which engine, they match engines for torque max. 4.3 L v6? or 5.7 V8 there are 4 engines, and matters which. not the Diesel right? ask the the seller of it. re builder shops that. or ask GM that. ask your source that,? vast there are/ 700R4 of some kind I think. gmc sierra c/k????pickup c1500 or GMC Sierra 1500 4.3L THM700-R4/4L60/MD8 5.0 THM700-R4/4L60/MD8 5.7 THM700-R4/4L60/MD8 the seller all say the VIN is needed to get the correct part. and RPO if smarter.(wink)
8/14/2022 9:14:27 PM • GMC Cars &... • Answered Yesterday
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Can someone help me find a place to purchase connecting rods for a GM engine?

I would suppose that they are not common and would have to be ordered. So try a GMC dealership in your area.
8/11/2022 5:39:43 PM • GMC Cars &... • Answered on Aug 11, 2022
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Hot Short On Our 2001 GMC Jimmy

Have the battery charged and tested it is in a discharged state at the moment , a charged battery should 12.4 volts ,Then you can check for shorts .
8/11/2022 5:34:43 AM • GMC Cars &... • Answered on Aug 11, 2022
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2005 Envoy XL have no brake lights, only the top light on the gate works

could have faulty turn signal switch because the brake light circuit flows through the turn signal switch.
8/9/2022 4:03:52 PM • 2005 GMC Envoy... • Answered on Aug 09, 2022
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I have a 1996 gmc Sonoma. Headlights will work sometimes.

Consider the dimmer switch on the steering wheel; the wires from it wouldn't affect the tail lights, but could possibly affect the headlights. Hopefully loose wires from the assy is the problem.. replacing the unit might be difficult. or expensive.
8/7/2022 3:13:37 AM • 1996 GMC Sonoma • Answered on Aug 07, 2022
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Tbi one floods and one doesn't work at all ,where should I start?

First check to see if they are getting the proper signal from the ECM. Use a noid light to see the signal. Could be bad injectors or wiring . https://www.gmtruckclub.com/threads/1990-chevy-5-7l-tbi-fuel-problem.1472109/
8/6/2022 6:14:31 PM • GMC Cars &... • Answered on Aug 06, 2022
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2006 Gmc Envoy SLE won't crank no power window, no power lock, all gauges on cero

(I replaced the battery this morning, it doesn't change anything and it for some reason is draining the battery) Something draining the battery - you have a parasitic draw on the battery, like something is on but isn't. More than likely the instrument cluster is the problem. Silver solder migration on the circuit board inside the instrument cluster can cause a parasitic drain on the electrical system. Also, can short out the serial data network causing no start conditions. Diagnose: Battery Drain / Parasitic Draw - Chevy Trailblazer - YouTube Chevrolet Truck - Battery Dies Overnight - Part I - YouTube Chevrolet Truck - Battery Dies Overnight - Part II - YouTube Watch the videos !
8/6/2022 6:02:16 PM • GMC Cars &... • Answered on Aug 06, 2022
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Why is My 1988 GMC S15 Randomly dying?

Possible IAC, idle control valve, trouble. Could be dirty. Did you add the sea foam through the throttle body or fuel tank? Also could be the electric control module.
8/6/2022 1:19:28 AM • GMC Cars &... • Answered on Aug 06, 2022
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My alternator wont charge battery on 95 gmc sonoma

Here is my Alternator 101 class for today, what can fail. (all) Jeff nails it. (2.4 or 4.3L engine I can not guess) both are internal REG.
  1. battery is bad, if shorted cell in battery , altenator shuts down to prevent battery explode and acid every where. so test the battery first, for sure over 5 years old.
  2. alternator swaps and blew the 100amp fuse there , next time pull battery NEG lug to replace any ALT. or blow it again you will
  3. wires bad, or unplugged or connected backwards
  4. the rear ALT plug has 4 pins all 4 must be wired end to end correctly,no hack jobs seen here. and ALt lamp pin next.
  5. the cluster lamp ALT must not be burned out or self excitation fails and alt is born dead. replace the ALT lamp NOw. if blowned.out. in IP cluster.
  6. bad alternator or wrong one there now.(hack jobs)
  7. Engine idle RPM way way below 800 RPM and the ALT goes off line then,.
  8. Fan belt slip to alt. pulley, (sorry typed this out of order)
  9. a battery and anD alt both can be carried in hand to autostore and they test it, better stores do that, they load test the battery and spin test the alt.
  10. tests: more, put battery from good car to here and test now.
  11. jumper start the car, using 2nd running car, or ask a tow truck for a jump.
  12. below I pust red donuts on all fail points 3 fase MUST BE GOOD , 0 OHMS MESSURED. best is with battery unplugged never use meter DMM ohms with voltage present.(tech 101)
sonoma1-undefined-undefined-0.jpg\ the lamp must be good as vast regulators fail , reg is inside ALT.
8/5/2022 12:26:27 PM • GMC Cars &... • Answered on Aug 05, 2022
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I cant remove the rearview mirror button to fix

Hi Teresa,Yes, you are correct. The mirror bracket (the small piece - see picture below) has to come out of the mirror stem in order to get the thing glued back on to the windshield.MOST GM vehicles have either a Hex or Torx head screw that holds onto the bracket. (see picture below)If your mirror does not have this screw, then it is held by a spring clip (which is what I think you are describing). If this is the case, look at the bottom edge of the mirror stem/bracket assembly. There will be a small hole (slot) between the mirror stem and the mirror bracket. Take a paper clip and shove it as far as possible up in the hole. This will push and hold the spring clip back so you can slide the bracket out of the mirror stem. Please note that you are only trying to get the paper clip BETWEEN the spring clip and the bracket - the spring clip does not come out of the mirror stem assembly without breaking things. (Sorry, I do not have a picture of this type of fixture)When you go to glue the bracket onto the windshield, make sure that all of the old glue is cleaned off first. A razor blade works well for this task. Then follow the directions in your mirror glue kit for applying the primer and glue.Make sure the bracket is oriented correctly when you stick it to the windshield. Some mirror glues are very unforgiving and will stick almost instantly, making corrections nearly impossible.One more hint: If the old glue (or the outline of the old glue) is still on the windshield, use a "sharpie" pen to trace around it on the OUTSIDE of the windshield. This will serve as a "locator" once you have cleaned and primed the windshield in preparation for the bracket to get glued. The pen mark can be cleaned off with regular windshield washer fluid when you are finished.10_17_2011_6_34_50_am.jpg10_17_2011_6_35_25_am.jpg
8/3/2022 2:59:43 AM • 1999 GMC Sonoma • Answered on Aug 03, 2022
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Lost power steering on a 2006 gmc envoy 4.2 2wd

Recheck fluid level.
8/2/2022 12:15:14 AM • GMC Cars &... • Answered on Aug 02, 2022
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My 2007 gmc sierra denali displays $7EB, $7E8, $7EA. hopefully you help me reslove this issue so i can fix it and stop the engine light from coming on. Best Rgards

How did you come up with these codes ? OBD2 codes all start with a P like P0301 , P0117 , You mite want to have an other scan tool hooked up . Get the correct DTC'S then we could advise you . Trouble Codes
7/31/2022 7:21:14 PM • GMC Cars &... • Answered on Jul 31, 2022
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How to test the neutral safety switch on a 2010 GMC Sierra

The best way, easiest way, with a professional or factory scan tool . Check input data to the TCM - transmission control module. The long drawn out way, viewing wiring diagrams, then using a DVOM - digital volt ohmmeter an test electrical circuits one by one. Check out videos on youtube. The transmission range (TR) switch is part of the park/neutral position (PNP) and backup lamp switch assembly, which is externally mounted on the transmission manual shaft. The TR switch contains four internal switches that indicate the transmission gear range selector lever position. The transmission control module (TCM) supplies ignition voltage to each switch circuit. As the gear range selector lever is moved, the state of each switch may change, causing the circuit to open or close. An open circuit or switch indicates a high voltage signal. A closed circuit or switch indicates a low voltage signal. The TCM detects the selected gear range by deciphering the combination of the voltage signals. The TCM compares the actual voltage combination of the switch signals to a TR switch combination chart stored in memory.
7/31/2022 7:00:59 PM • GMC Cars &... • Answered on Jul 31, 2022
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Wiring diagram for a 1997 gmc 2500 4l80e and cruize control

google for the service manual, and pay. if must even $10 or pay $20 here like all savvy ASE techs do. https://eautorepair.net/Marketing/Default.asp
7/30/2022 7:38:06 PM • GMC Cars &... • Answered on Jul 30, 2022
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2002 gmc yukon xl rear heat blows heat front blows cold air

Try to back wash the heater core first if it doesnt work then its clogged up try to turn the heater on the front with the heater off for the back keep an eye on the temp guage if it goes up than normal then its clogged.... Fyi u have to run the engine for awhile with the heater fan on
7/28/2022 7:39:22 PM • 2002 GMC Yukon... • Answered on Jul 28, 2022
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Transmission compatibility?

The best thing to do is visit your local wrecking yard. They should tell you what can be switched and what problems you might run into.
7/27/2022 8:12:24 PM • GMC Cars &... • Answered on Jul 27, 2022
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