2003 GMC Yukon XL - Answered Questions & Fixed issues


I have a GMC Yukon XL 2003 and I need to know what this part is. Can you help me
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2003 GMC Yukon... | Answered on Jun 03, 2019 | 651 views


I suggest you get one of those manuals people get nowadays to do it yourself.. My brother used it to repair my car and
it's totally repaired now. he got it from. www.reliable-store.com

2003 GMC Yukon... | Answered on Mar 07, 2018 | 248 views


2003 gmc
If you're finding it difficult to service/repair your car, get one of those online manuals.
You'll not have to wait for others to answer, or rely on mechanics and all. Plus i know a website that sells very cheap but very very good manuals online, without expiry i.e. for lifetime.

2003 GMC Yukon... | Answered on Feb 01, 2018 | 67 views


It sounds like you have a bad connection on the battery. Make sure to clean the connections, make sure they are tight, and make sure the ground cable has a good connection at both ends, battery side and body/frame side. The bad connection is the only answer when the battery is fully charged and you turn the key and it all goes out. If you can turn on your headlights and press the brake at the same time, and they work, then it may be something else, but I would be amazed if they do work given your description of your problem.

So, make sure the battery is charged and clean and tighten all your connections. Test battery connection by putting it under a load with all the lights, head, and brake at the same time. If it goes off then, redo cables again.

Good luck.

2003 GMC Yukon... | Answered on Jan 08, 2018 | 150 views


2 wheel drive or 4 X 4 ? Automatic or manual climate control
Do you know what DTC'S - diagnostic trouble code's are ?
DTC B1375
The ignition 3 voltage circuit is a discrete input to the HVAC control module. The HVAC control modules uses the input to determine that the ignition switch is in the RUN position. When the ignition switch is in the RUN position, ignition voltage is applied to the input.
Rather then guessing as to what the problem , not being able to diagnose properly , your best bet mite be to have a qualified repair shop check it out . Would need to hook up a professional or factory scan tool to check code's ,see if the climate control module will communicate with the tool .
HVAC Control Module
The HVAC control module is a class 2 device that interfaces between the operator and the HVAC system to maintain air temperature and distribution settings. The battery positive voltage circuit provides power that the control module uses for keep alive memory (KAM). If the battery positive voltage circuit loses power, all HVAC DTCs and settings will be erased from KAM. The body control module (BCM), which is the vehicle mode master, provides a device on signal.

2003 GMC Yukon... | Answered on Jan 03, 2018 | 131 views


Look for a chaffed wire in the hinge area of the driver's door. That's the most likely place to find a short or break

2003 GMC Yukon... | Answered on Dec 27, 2017 | 23 views


What's your question ? Tailgate ajar light lit on the instrument cluster ?
The Body Control Module (BCM) monitors the lift glass and the cargo door ajar switches. When the switch closes, the path to ground is completed, and the BCM sends a class 2 message to the instrument cluster to display the CARGO DOOR AJAR message.There are two ajar switches for the rear door ,a left an a right ,the third switch is for the lift glass ajar switch . All three of these switches splice pack SP410 At ground point G410

(Shouldn't have any readings when door(s) and/or window closed.) It's the opposite . switches are open with door closed , G410
In the Body Harness, Behind the RR quarter trim panel near the D-Pillar
It turns out it has nothing to do with rear door. Something about drivers door actuator. NO IT DOESN"T !!!!

2003 GMC Yukon... | Answered on Nov 09, 2017 | 411 views


Check all fuses in your power box. Sounds like could be electrical short. Check connections and grounds to alternator and starter and battery. Also check coils, plugs etc.

Once resolved, try a can of SeaFoam from Canadian tire $12.00..put half in a full tank of gas and the other half in your oil. Do this when the engine is warm, not hot. Let it sit for 30 minutes then take it for a 10 minute drive and see the difference. Save hundreds in injector flushing. This should alleviate the hard starts.cheers.

2003 GMC Yukon... | Answered on Nov 01, 2017 | 54 views


Probably all related , all these systems are interrelated .One won't work without the other. Could have a problem with the TAC system - electronic throttle control . Your best bet , take it an have the computers checked for DTC'S - diagnostic trouble codes . Do you know anything about automotive electronic's ,serial data communication networks ?

2003 GMC Yukon... | Answered on Sep 16, 2017 | 160 views


there will be fault codes if you use the correct scanner that has the right protocols for the car system
the problem will be faulty injectors ( squirting and not atomizing) or the fuel pressure is too low to crack the injectors
take it to an accredited specialist diesel shop for a proper diagnosis and quote
continue to use easy start and you will have more than a no start problem as that has the capability of blowing a rod through the sump

2003 GMC Yukon... | Answered on Jul 26, 2017 | 570 views


There is no pressure switch - just a pump fuse, a relay and a pressure regulator. The pump runs continuously when the engine is running, and the regulator sends gas back to the tank if the engine doesn't need it at the correct operating pressure.

2003 GMC Yukon... | Answered on Jul 07, 2017 | 74 views


Replace the insturment cluster or fix it ! From 03 to 06 GM insturment clusters had bad stepper motors , this motors control the gauges .
How to repair GM Instrument Cluster Speedometer Gauge Stepper

Plus they have silver migration , this is caused by the solder they used . Can cause wierd problems .
Chevrolet Truck Battery Dies Overnight Part II

2003 GMC Yukon... | Answered on Jul 07, 2017 | 143 views


I will bet the check engine light comes on as well?

2003 GMC Yukon... | Answered on Jul 05, 2017 | 136 views


id be looking at a wheelspeed sensor with a wire about to break off. or a bad connection possibly. plug and unplug them all at least twice to see if the issue goes away..cheap to try.

2003 GMC Yukon... | Answered on Jul 03, 2017 | 204 views

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