Top 20 2003 Chevrolet Tahoe Questions & Answers

Question edited for clarity. Question moved to model category. There are 4.3 and 5.7 engine variations, but this say two ABS sensors and one transmission speed sensor. https://www.autozone.com/engine-management/vehicle-transmission-speed-sensor More and a video that may help https://www.google.com/search?q=2003+Chevy+Tahoe+2+wd.+How+many+speed+sensors ..

Question moved from MISC to model category. Check the link and images tab https://www.google.com/search?q=03+chevy+tahoe+5.3+bcm+wiring+diagram ..

I will post and not cover Rear AUX heater box. ok, and is and option what part of this car has blower is this HVAC blower failing on HIGH is this manual version or climate control option. fuse are blown in cab or in bay (engine) fuses are first of high speed blower mode fails dead. what IS A CKED ????? is see no hits in my ASE books on that part or device name in a car or a truck 2003 chevy tahoe , no engine /trans told. (this dictates fuse boxes) my guess HVAC topic but no sure, what fan/blower or turbo this is. climate control model has left and right controls and all differenet wiring max. differ. fuse Hvac1, hvac-ECas, and fuse BOWER< yes 3 fuse must not be blown and the BCM is the brain here. not scanning the PCM to see BCM errors is a huge error in testing manual controls the resistor block uses a relay to send 12dc to he blower set to HIGH. all resistors bad ,high still works. here are the 4 things to fail; 4 is good so 3 things, 2 fuses, #3 is relay. to fail. a volt meter finds this easy for sure reading this page in the SM.below 3 pins on relay are at 12v. so are pin F and G 12vdc if not input to them is bad. not counting bad wires.,

When the fuel pump was changed, the battery was disconnected as standard practice.Now the Security System needs resetting. https://www.google.com/search?q=2003+chevy+tahoe+security+reset ..

Question edited into basic written English. Question moved to the correct make model category. Duplicate post deleted and amalgamated into this question. Please don't type in all CAPS, it is considered SHOUTING and is hard to read. Your heating is run from the Body Control Module. You have a very complex vehicle, and you can't fix this yourself, you need an auto electrician with a pro grade, bi-directional scan tool to diagnose where the breakdown in communication is.

no info generic answer check wiring and controller for short or failure

do not remove more then than 1 plug wire at a time, reinstall it before moving to next one. Make sure you have all tools needed. https://www.youtube.com/watch?v=R5jiNYx9ER8

Note the diagram, hope you can read it. Tail lamps/park lamps, the same thing. This diagram is for right rear, note the fuse, rr park fuse, goes hot when you turn on headlamps or park. at the right rear tail lamp, brown wire with white tracer is voltage, that bottom black wire in diagram is ground. Need both voltage and ground. not only make sure fuse is good, use a test light to see if voltage at fuse when you turn on headlamps. If no voltage, have to backtrack that circuit. good luck.

You need to be a bit of a detective for this. Is it one or two rattles then it stops or a constant ' machine gun' rattle sound. Is the noise there when the vehicle is standing at idle, only when moving or both? Does road speed alter the sound? Does the noise change if you stop and Rev the engine? Does cornering affect the noise? Use the comment button below and I'll see what extra help I can give you.

Any recent engine repairs ? Trouble codes ?

Bad bearings mine bad sensors, broken ABS wires,

Did you check your spark and your fuel pressure?

https://www.youtube.com/watch?v=0eIuOZwgbkc This video will help you

Passlock is pretty easy to diagnose and fix. See this post on how it works http://ricksfreeautorepairadvice.com/how-passlock-works/ The fix usually involves replacing the lock cylinder case http://ricksfreeautorepairadvice.com/passlock-fixes/

There is no "wire" to use, the factory radio is connected to the canbus (part of the vehicle communications wiring that goes to your computer in the car). You need a converter box that converts it to a signal that your radio can "understand." https://www.scosche.com/2003-up-gm-class-2-29-bit-lan-interface

It really sounds like a tranny problem, best addressed by a Transmission shop. It might be an easy fix, or a really expensive one.

OK... this is from a "SOLVED" 2002 FIXYA post for: "Temp sensor and compass not displaying on my 2003 yukon xl" Temp sensor and compass not displaying on my 2003 yukon xl ... this info MAY help you with your 2003 Tahoe ~ it has some good tips for you!? Here is more: "Chevy Mechanic: Dave Nova The problem is going to be a break in the circuit between the *SIR fuse and the yellow wire at the mirror connector. This wire travels through the relay block. You can check connections at the relay block and trace the wiring. You can also just run a new wire, it may be faster." and "Check for voltage on the yellow wire at the mirror connector with the key on. If there is voltage on the yellow wire then the problem is inside the circuit board in the mirror and the mirror will need to be replaced." Dave Nova included the Fuse Block shown below in his post, but I see no "SIR" Fuse? * I just discovered it is a "Supplemental Inflatable Restraint (SIR) Fuse = AIRBAGS. The two photos below are MUCH closer to what you should have! SEE YOUR FUSE ASSIGNMENTS HERE: Chevrolet Tahoe GMT400 mk1 1992 2000 fuse box diagram Auto Genius http://www.autogenius.info/chevrolet-tahoe-gmt400-mk1-1992-2000-fuse-box-diagram/ $50 please ANTHONY just kidding of course and by the way, MERRY CHRISTMAS 2017 as of 24 min ago!

You may need to clean inside the throttle body. YouTube has videos on how to do it. Also, your Idle Air Control motor might have carbon build-up in the passage for idle air. Take the motor off, and clean it gently and check the air passage for blockage.

At this website www.reliable-store.com I found all complete guide, much better language, complete detail in 800+ pages, and they also have live assistance feature

to locate and fix the you can take help from service and repair manual which you can get from the given link to save your time and money http://toolsnyou.com/