Top 20 2009 Hummer H3 Questions & Answers

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.

Spray water on the roof (with a friend inside looking) and find the leak, that is the only way.

There is a solenoid on your transfer case that is used to shift from 2WD to 4WD. It may have frozen or is just stuck. If you know what to look for, get underneath the vehicle, find the transfer case and locate the shift cylinder. There is an electrical connection on the shift cylinder. Ensure that it is plugged in.

3 years on, battery life is almost done with , just replace battery and u wont face this issue, generally battery lasts 3-4 years, then weather also plays its part. replace battery and thats it , u shall have peace of mind.

faulty tacho or short in the wiring

Circuit/System Description When the transmission is placed into REVERSE, a 12 volt signal is sent to the rearview camera image display module indicating that camera operation is requested. The rearview camera image display module then supplies ignition voltage and ground to the rear vision camera. The rear vision camera sends video information through the rearview camera image display module to the inside rearview mirror through a video signal + and a video signal - circuit. A grounded shielding also wraps the video signal circuits to reduce electronic interference which may degrade the video signal and cause a distorted or otherwise degraded image. Rearview Camera Image Display Module (UVC) In the instrument panel behind the driver side knee bolster to the right of the steering column Do you know how to do electrical testing ? Rear Vision Camera System Does Not Display Ignition OFF, disconnect the harness connector at the rear view camera image display module. Test for less than 1.0 ohm between the ground circuit terminal 3 and ground. ? If greater than the specified range, test the ground circuit for an open/high resistance. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 2 and ground. ? If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. Ignition ON, park brake applied, vehicle in REVERSE, verify that a test lamp illuminates between the control circuit terminal 1 and ground. ? If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. Ignition OFF, connect the harness connector at the rear view camera image display module. Disconnect the harness connector at the rearview camera. Ignition OFF, test for less than 1.0 ohm between the ground circuit terminal B and ground. ? If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the rear view camera image display module. Ignition ON, park brake applied, vehicle in REVERSE, test for 5.8-6.2 volts between the 6-volt reference circuit terminal A and ground. ? If less than the specified range, test the 6-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the rear view camera image display module. ? If greater than the specified range, test the 6-volt reference circuit for a short to voltage. If the circuit tests normal, replace the rear view camera image display module. Ignition OFF, disconnect the harness connector at the rear view camera image display module. Test for less then 1 ohm between the shield ground circuit terminal 10 at the rear vision camera display module harness connector and terminal D at the rear vision camera harness connector. ? If greater than the specified range, test the shield ground circuit for an open/high resistance. Ignition ON, test for less than 1 volt between the signal circuit terminal 9 and ground. ? If greater than the specified range, test the signal circuit for a short to voltage. Test for infinite resistance between the signal circuit terminal 9 and ground. ? If not the specified value, test the signal circuit for a short to ground. Test for less then 1 ohm between the signal circuit terminal 9 at the rear vision camera display module harness connector and terminal C at the rear vision camera harness connector. ? If greater than the specified range, test the signal circuit for an open/high resistance. Ignition OFF, disconnect the harness connector at the inside rearview mirror. Ignition ON, test for less than 1 volt between the following signal circuits at the inside rearview mirror harness connector and ground: • Video + signal circuit terminal 6 • Video - signal circuit terminal 7 Test for infinite resistance between the following signal circuits at the inside rearview mirror harness connector and ground: ? If greater than the specified range, test the signal circuit for a short to voltage. • Video + signal circuit terminal 6 • Video - signal circuit terminal 7 ? If greater than the specified value, test the signal circuit for a short to ground. Test for less then 1 ohm between the following signal circuits: • Signal circuit terminal 12 at the rearview camera image module and terminal 6 at the inside rearview mirror. • Signal circuit terminal 11 at the rearview camera image module and terminal 7 at the inside rearview mirror. ? If greater than the specified range, test the signal circuit for an open/high resistance. If all circuits test normal, test or replace the rear vision camera. Ignition ON, park brake applied, vehicle in REVERSE, verify a clear rear vision image is displayed on the radio. ? If a clear rear vision image is not displayed, test or replace the inside rearview mirror

Could be the sensor usually on top of the dashboard. It may think it is always daytime.

Sounds like your front drive shaft between the tansfer case and the front differential. Or it is a Haft shaft going out to the front wheels.

follow this link as i think it is exactly as your describing Thread H3 Manual Transmission Stuck Throttle

GM with Hummer has a recall pending on that exact thing due to possibility of a fire. Contact your dealership to see when they finalize the recall, right now they are still working on a part for the fix before they begin having anyone bring their H3 in to be fixed.

check the harmonic balancer for correct operation and condition

check fuses and relays especially the control module..

technician will do it, u cannot

Hi J, I think your problem must be related to the electrical supply to your system. It sounds as if you have constant power which means the connection has been made to the incorrect terminal. Trace the cable which feeds the set with power and connect it to the correct output from the ignition switch. Keep in mind the set needs one constant power which is for the internal memory and the other is controlled by the ignition switch. I suspect they have been connected together. Regards John

If you have swapped out your old factory radio with another factory radio from a different unit, it will not work. It is coded to the VIN#, Just to replace a radio at the dealer you must link up and download the current configuration from the old unit using the GM TECH-II, then remove the old unit and install the new one, upload the old config files to the new unit and hope it works. Sometimes it doesn't and you have to keep swapping units back and forth to download and upload and eventually maybe getting a successful upload. If all your doing is replacing the factory unit with another factory unit, it will work if you take it to a dealer and they do the process explained above. Just don't throw out your old radio, they will need it because all of your old config files are still in it!I hope this info helps!~subyguru~

The usual problem is the vent solenoid.The only thing is the best way to check it is with a scan tool.The vent solenoid is located in the rear area just in front of the rear axle.By the canister.There will be a line going from the canister to the fuel tank.Replacing will not make the light go out right of way but if this is the problem it will go out once the PCM performs a couple of run cycles and passes the test.Other wise the only way to clear the code is a scan tool.As far as the blower motor.If it does not work at all.You need to go on the passengers side and If there is and insulator panel then remove it so you can see the blower motor.Take a screw driver and tap on the motor with the handle part of the screw driver.If it starts to run then replace it.It might keep working for a while but it will eventually go out again.If it works on some speeds then you might have a bad blower resistor module.Hope this helps.Good luck.

This symbol is usually your security light it flashes when the vehicle is locked. It comes on solid and goes out after it recognizes the key. And it flashes fast when it thinks it's an invalid key

It's under the hood in engine compartment (driver side)

Hello: Down stream usually means behind the catalytic converter. What you really need to know is it sensor 1, sensor 2, or sensor 3.

Inside or outside the truck can you smell it ?