Question about 2003 Hummer H2

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Repairing P1875 code for hummer 2 2003 model

How to find and repair the 4WD low circuit fault in Hummer 2 2003 model.

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5 Suggested Answers

Ajkill
  • 2035 Answers

SOURCE: hummer h2 2003 55000 mill

Remote the battery wire from the car for 20 minutes make and plug it back this will reset the computer of the car if the light is on you need to service center and get it checked....................

Posted on Jun 08, 2008

SOURCE: turn signal repair hummer h3

my computer screen is the wrong way round?

Posted on Jun 28, 2008

SOURCE: my 2003 h2 hummer will initally not shift from

Check the linkage that goes from the shift lever down to the transmission. It sounds like somewhere along the line, it has become disconnected or has broken.
if that parts are clean then It sounds like you have a shift control solenoid that has high resistance causing the hard shift you describe. Scan the PCM for trouble codes if none are present you could have a internal transmission problem.

Posted on Jul 17, 2009

  • 1 Answer

SOURCE: hummer h2 idle rpm too low

I can't solve the problem but was hoping you found the answer. I have a 2003 Hummer H2 and I am having the same problems if started in park or Neutral it will idle fine but if I put it in drive or reverse it will not idle

Did you find the solution and if so could you email me the fix.

tdunham@drainageplus.com

Thanks,

Troy

Posted on Jul 30, 2009

abdoush
  • 12 Answers

SOURCE: 4WD switch not working on a Hummer H2

Same thing happened with my H2 2003 model, no lights above the 4wd buttons and i can't switch between high and low 4wd.
did u know what is the problem ?

Posted on Sep 08, 2009

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2 Answers

Why is the service 4WD message on all the time and diff lock light flashes and dos not lock?


Hummer 4wd service light reset Questions & Answers - Fixya

www.fixya.com > Forum > Tags > 4wd service light reset
Hummer h2 2003 55000 mill ... service 4wd the liht is on all time Remote the battery wire from the car for 20 ... My 2006 H3 will not come out of 4 wheel drive?

Sep 22, 2015 | 2006 Hummer H2

1 Answer

My 2005 hummer h2 will not shift into 4wd high or low the 4wd button for everyday driving is lit up but when I try and go to 4wd high or low or lock it just flashes the light and nothing happens


When the 4WD lights flash on and off, this indicates that there are 4WD-related trouble codes in the 4WD control module. Sometimes 4WD lights never illuminate.
The first step in diagnosing the system is to establish communication and retrieve trouble codes from the control module. After retrieving the codes, write them down, clear the codes and retest to see which codes are regenerated. False codes can be set if a component is disconnected when the key is turned on.
If the 4WD lights flash on and off, and no codes are found in the 4WD control module, try clearing the codes anyway. After a certain amount of key cycles, the codes will normally clear from the 4WD control module, but the module will not respond to commands until it is re-initialized by clearing the codes or disconnecting the battery to erase its memory.
If your scan tool will not communicate with the 4WD module, first verify that the scan tool has the proper software and the latest updates. If it does, then try another scan tool. If it still has no communication, the power and grounds that are supplied to the module will need to be tested. See if the scan tool will communicate with the other modules on the shared communication network. If they're OK, check the harness from the data link connector (DLC) for an open circuit to the 4WD module.

Apr 23, 2014 | Cars & Trucks

1 Answer

1996 chevy s10 code read a P1875. what is it and how to fix it?


In Chevrolet vehicles, code P1875 is given the description "4WD Low Switch Circuit Electrical." A fault has been sensed in the electrical switch circuit for the low setting of the four-wheel drive when this code appears. The problem sensed is within an electrical circuit that connects the Vehicle Control Module to the Transfer Case Control Module. good-day !

Jan 08, 2012 | Chevrolet Blazer Cars & Trucks

2 Answers

The reduce engine power message keeps coming on, giving limited power when driving does anyone know what the proble could be with my 2007 hummer H2 SUT.


The Powertrain Control Module (PCM) is shutting down your throttle body control for some reason and limiting how much throttle you can apply. The only way to find out why it is doing this is to scan the PCM for Diagnostic Test Codes (DTCs) and diagnose any existing codes accordingly. It is very likely to be caused by a fault in your throttle position sensor or accelerator pedal position sensor circuits.

There is a Technical Service Bulletin (TSB) for your vehicle which covers a known problem with reduced engine power and sets DTC P2138. The known problem is that the Accelerator Pedal Position (APP) sensor circuits are being infiltrated by water intrusion into a connector and causing erratic voltage readings at the PCM. It is TSB reference # 07-06-04-019D

Jul 18, 2011 | 2007 Hummer H2 SUT

1 Answer

Do you drive.in two wheel or four wheel drive, how do you change.to two wheel drive?


The Hummer H2 and H3 are both all time 4WD. There is no way to put it in 2WD. Now, you can select 4WD High or 4WD Low. You can also, if your vehicle is equipped with it, lock the front or rear wheels through the differential selector. This is one of the primary reasons Hummers get terrible gas mileage is because they are always in 4WD.
The only other solution is to swap the transmission to an Allison 6Spd, which is often done with diesel conversions, and they usually give you a 2WD option, and can get up to 25 MPG out of an H2.......but that conversion is about $30k.

Jun 23, 2011 | 2005 Hummer H2

3 Answers

Code po650, po332,p1875 comes on what do they mean exactly,whats wrong


CODE PO650 MALFUNCTION INDICATOR LAMP CIRCUIT MALFUNCTION CONDITIONS. POSSIBLE CAUSES MIL CONTROL CIRCUIT IS OPEN , SHORTED TO GROUND TO SYSTEM POWER,MIL CONTROL POWER CIRCUIT OPEN IN THE INSTRUMENT CLUSTER, MIL THE LAMP IS DAMAGED OR HAS FAILED,INSTRUMENT CLUSTER OR THE PCM HAS FAILED. CODE PO332 KNOCK SENSOR CIRCUIT LOW INPUT BANK 2 CONDITIONS, POSSIBLE CAUSE KNOCK SENSOR FAILED, CODE P1875 4WD LOW SWITCH CIRCUIT MALFUNCTION CONDITIONS FOR TRANSMISSIONS 4L60E 4L80E, POSSIBLE CAUSES 4WD SWITCH LOW SIGNAL CIRCUIT IS OPEN OR SHORTED TO GROUND, 4WD LOW SWITCH IS DAMAGED OR IT HAS FAILED,PCM HAS FAILED.

Mar 14, 2011 | 2003 Chevrolet Avalanche

2 Answers

My 2006 H3 will not come out of 4 wheel drive?


Hummers are 4WD all the time, you can never take it out of 4WD. Now, you can select between locked 4WD HIGH and locked 4WD LOW. Those are switched by putting the vehicle in Neutral, and pushing the button the dash, waiting till the correct indicator light illuminates and then putting the truck in drive. Based on the above info, what exactly kind of 4WD drive problem are you having?

Feb 13, 2010 | 2009 Hummer H3

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