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.

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: Crankshaft replacement fit? 2006 Hummer H3

Hello - the crankshaft on the 3.7l LLR engine does in fact have the same stroke as the L52 3.5l engine in your H3, so there is a good chance it is compatible. Check with your Hummer parts specialist for...

Q: Mirror won't swivel using inside switch

Hi. If your mirror is not longer functioning correctly, it may be possible that the mechanism connecting the mirror to the motor has become damaged. Many times, these are made of plastic, and can become brittle and easy to break....

Q: Number five cylinder problem

The wiring on older Volvos, such as with your 1996 Volvo 960, can be a little temperamental and have bad connections. If the ignition coil is good but the coil itself is not receiving the electrical signal from the computer,...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...