Skip the auto shop - Our mechanics make house calls

Q: Electrical or transmission problems with Hummer

asked by on

I am having electrical problems with my Hummer. My doors lock and unlock without being triggered, my gear indicator flashes from drive, to reverse, to park. Sometimes, when I start the vehicle, the gear indicator shows the vehicle as being in 1, but it is in park. I am not sure if it is a grounding problem or if has to do with the transmission. I had a new battery put in and a diagnostic run, but the problem could not be found. I had an aftermarket remote starter installed over a year ago, and had it removed to see if that was the problem, but the problem remains.

A: Hi there. This vehicle is known for having ...

Hi there. This vehicle is known for having a history of electrical issues. From the symptoms you are getting it sounds like a bad ignition switch or a failing body control module. Most of the time it is the ignition switch. When it fails internally it causes these systems to act up almost like the key is being turned off and on. This can be diagnosed with a voltage meter by doing a voltage drop test on the switch. If the switch is fine then the body control module will need to be replaced. If this is something that you want to have diagnosed, consider YourMechanic, as a certified mechanic can come to your office to inspect your electrical problems.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Rejects the nozzle when filling gas

Hello, It sounds like you may have an issue with your evaporative emissions control system. The EVAP system prevents fuel vapors from the fuel tank from escaping into the atmosphere. The EVAP system collects and temporarily stores the fuel vapors...

Q: Is a 2007 Hummer H3 a reliable vehicle?

For the 2007 model year, GM replaced the problematic 3.5L engine with the 3.7L. This engine is pretty decent. The transmission is a 4-L60E, which is well known for having all kinds of issues. The GM 10-bolt rear end is...

Q: Instrument panel acts erratically and A/C won't cool

There is a GM technical bulletin (#PIC5615B: Intermittent IPC Backlight Flash Or IPC Inoperative Code U0155 May Be Set - Feb 19, 2013) that may apply to your vehicle and the issue you are experiencing. They mention inspecting fuse F26DA...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...