Hummer H3 - Popular Questions, Answers, Tips & Manuals

no year truck told why make it so hard.? 2006 to 2010, just 5 years.sold it can only be 2 places then. fuel rail or in the tank pump rack if car has 2 fuel lines it is on the rail if 1 line it is in the tank. 2 lines means low pressure regulation why not just pretend to buy it online see where it goes here I will for you in the USA the EPA caused this change,. BINGO 2008 guess 5.3L guess2 bingo in the rack https://www.rockauto.com/en/moreinfo.php?pk=5929317&cc=1441263&pt=10147&jsn=1041&_nck=Ekt6BqBF1pwlXdx0gYlm1XyS%2BrEifIwvxWIl7Mt9zft%2BWrd9NkObID6vX0VSfQvQu4KjTdKrzbDUBi9MzX%2FMdafUFWZ%2BkPLPhA3p459yzN6Kx9av8o0LZZeZcw1BlrZsyqN5mxsHgljscTFxks%2BO5NY5rLt8F4DK8Tawqmjk8dG9yROMXCPDLMJb876dqpOM0%2BG19tvZWSevwMEnCAYcUkYY9fAhpBZIXbFxUv4Gy09RmhWVlvNmIPSUIMAVvETkC9%2BUdWdQyhVKA4qQLNE2PYWkYeHwd3x8JoiUOjEiqI7ezoumSA%2BlUDltDKLaMbpqYChHkdNZMN9orXthuE4L3f0uDEamphST877IAFeeNPP7w7t9Ao%2B40cSj5HuF8wud

Question edited for clarity. Question moved to model category. So you now have 3 issues with your H3. They are all electronic. You need a qualified auto electrician with a professional grade scan tool computer to read the Diagnostic Trouble Codes. The codes tell the story and the fix. https://www.google.com/search?q=mobile+auto+electrician+near+me ..

levels good (tranny dip sticked , hot, idle , in park) shift linkage not bad. PRNDL does car move in park if car, is in park, and take off all brakes can car be pushed,? if yes park is failing too, and is bad shift linkage. this is step 1 and 2 in the service manual on topic of like 20 test. on car. RTM read the manual yet? buy it ?

no need to unless the compressor blew up. why not ask a shop to fix it.??? they do a battery of tests and fix it fast. even in hours. to replace that valve behind the evaporator core on most cars is horror. (nothing less)<< so why we do all tests first not 10 hours labor for zero gained. that be over the top. THAT act BREAKS OPEN THE LOOP .! best is avoid that. AND ALL R134A Refrigerant is lost. doing that. a real shop captures it and looks for metal particles there. but this a last step. not first and testing is first. .lots of tests are first. low-side pressure (30 psi par) high-side. pressure (300 psi par) are dampers stuck closed fuse blow bad compressor clutch make sure compressor is ok, first, if is the expansion valve is ok but there are test just for that. Dye tests for leaks to be found . once you break the loop and pump down vacuum pump is manitory to remove all water there (like 85% humid air ) and if is R134 hates that. and fails,.hard. (weak AC) and once loop breaks, a new receiver/dryer is need too. and more, lots more.

Normally yes we do. Everything here points to the BCM as though it does everything. I am puzzled. https://www.google.com/search?q=+2008+Hummer+H3+ECM+pinout https://schwarttzy.com/wp-content/uploads/2013/01/Hummer-H3-Wiring-2008-1-4-1.pdf ..

use a meter to check switch and motor --also check track for debris jamming or gear problem

• Wiring problem - short to power maybe . Did you check wiring harness?
Anonymous Jan 27, 2022 Turn Signal Lamps The FRT/TRN/HAZ/CRTSY/MIRR and REAR/TRN/HAZ fuses in the underhood fuse block supplies battery positive voltage to the body control module (BCM). When the turn signal switch is placed in either the left or right position, a signal is sent to the BCM to illuminate the desired turn signal lamps. The BCM has an internal flasher that sends an ON-OFF voltage signal to either the left or right turn signals and their instrument panel cluster (IPC) indicator. When the hazard switch is pressed, a separate ground signal is sent to the BCM to activate and flash all turn signal lamps including both IPC turn indicators. The front and rear turn signals are grounded at G105, G350 and G340. The sound for the turn signal indicators is produced by the IPC.

Ive changed the relay and the headlight switch on the dash .. still wont turn off headlights ? Just changing parts won't fix it , need to test . Hooking up a professional scan tool , one that can read codes in the BCM - body control module is the way to start to find the problem . Then familiarize yourself with how they work. Headlamps Major components of this system are the body control module (BCM), headlamp relay, beam select relay, ambient light sensor, headlamp and panel dimmer switch, turn signal/multifunction switch, park brake switch, and the low and high beam headlamps. The headlamps may be turned ON in 2 different ways. First, when the driver places the headlamp switch in the ON position, normal operation occurs. Second, when the headlamp switch is placed in the AUTO position, automatic lamp control (ALC) operation occurs. During ALC control, the headlamps will be OFF in daylight conditions or in low/high beam operation in low light conditions. The headlamp relay receives battery positive voltage directly from the battery. The BCM supplies a ground signal to the headlamp relay for normal headlight operation. The BCM also supplies voltage to the beam select relay coil for high beam headlight operation. When the driver places the headlamp switch in the ON position and the dimmer switch is in the low beam position, the headlamp relay supplies current flow through the left and right low beam headlamp fuses to both low and high beam headlamps. Both low beam headlights are grounded through the beam select relay. When activated, the dimmer switch sends a ground signal to the BCM in the high beam position and a momentary ground signal in the flash-to-pass (FTP) position from G106. The BCM then energizes the beam select relay which switches the headlamp grounds from the low beam headlight bulbs to the high beam headlight bulbs illuminating the high beam headlights. With the headlights in the low beam position, the high beams may be momentarily turned ON or flashed by activating the FTP portion of the switch. The instrument panel cluster (IPC) illuminates the high beam indicator when the BCM detects that the high beams are requested. The IPC receives a class 2 message from the BCM requesting illumination. The Headlamps On at Exit and Perimeter Lighting modes can be adjusted using the steering wheel controls to select the function as displayed in the driver information center (DIC). The Headlamps On at Exit selection will allow the driver to customize the period of time that the headlamps remain illuminated upon exiting the vehicle. This period can be adjusted from 0-180 seconds. The Perimeter Lighting feature allows the driver to select if they want the headlamps and backup lamps to illuminate when the door UNLOCK button on the key fob is activated. This feature can be turned ON or OFF by using the DIC steering wheel control buttons. DTC B2575 Headlamp Control Circuit Circuit Description When the body control module (BCM) senses a request for headlamp or daytime running lamp (DRL) illumination, the BCM sends a ground signal to the headlamp relay through the low beam headlamp relay control circuit. The headlamp relay will illuminate the low beam headlamps. Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, command the headlamps ON and OFF. Does the headlamp relay turn ON and OFF with each command? Do you know what bi-directional control means ? Need a professional scan tool to do these type of test . DTC B2602: Daytime Running Lamp Control Circuit Low or Open DTC B2603: Daytime Running Lamp Control Circuit High Without this type of info. from service repair manual an using a scan tool your missing the big picture .

Question edited for clarity and *won't, not want. Take it into a garage that has a good diagnostic scan tool. That is an electronics issue.

Their is also the timing chain problem https://www.autocodes.com/p0017_hummer.html

that is the easiest

pretty much thats the easiest a bunch of gm vehicles are like that with the stat and housing mounted to the lower part of block

Number one is at the front of the engine, (fan belt end).

was the ignition switch / key flashed to the vehicle

The Borg Warner (BW) model 4493/4494 NR4 transfer case is a 2-speed, full-time 4WD, transfer case. The transfer case has an external planetary type differential, which has 2 different sets of pinion gears. The planetary differential provides a 40/60 torque split front/rear full-time. This means the front and rear propeller shafts are constantly being driven for maximum traction in all conditions. A high/low planetary carrier assembly provides the high and low ranges, which is a 6-pinion gear, sun gear, and annulus gear arrangement, giving a 2.64 low range reduction ratio in the BW 4493 and a 4:1 ratio in the BW 4494.

spend some money and buy a repair manual then read it

What kind of problem at start up ?????? After start up is the check engine light on , any codes in the computers -P - B - C - an U codes ??????

Regarding the hard-to-turn feeling with a H3 Hummer. I had the same problem with one of my Hummers. The remedy was quick and simple, but the actual fix was more involved. The remedy was to push the 2x4 button (take it out out of 4 wheel drive). The 4x4 button is very easy to touch and engage when reaching the right side of the dash (for any reason). If the engage light is burned out, there is no way to know that the vehicle is in high range 4x4, except while turning right or left, or when you notice that the 2 x4 light is not lit. The fix is to replace the switch, which is somewhat costly and labor intensive.

You might have no power steering fluids.

have alarm tested --