Skip the auto shop - Our mechanics make house calls

Q: won't start almost dies

asked by on

I had a hard time starting my Hummer today and it only has 28,000 miles on it. It didn't want to turn all the way over. I finally got it to start and seems OK, but there are more problems. I replaced the battery a couple of months ago. So it can't be that. When I step on the gas the outside lights and inside lights dim a little - sometimes - when in park. When I tap the gas the tachometer revs up to normal but then drops nearly 500 and the car almost dies. Could this be a bad alternator?

A: Hello. It sounds like the battery is indeed...

Hello. It sounds like the battery is indeed low causing the starting issue. From what you are explaining it sounds like the battery may be low because the alternator is failing and needs to be tested. Your symptoms point to either a bad connection at the battery or at the ground connections or at the alternator. These all need to be checked to find the issue. If you need to have this looked at for you, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose your car’s loss of power.

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: Heat and air controls broken

Hi. This can be caused by two things. There are actuators or motors under the dash that operate doors in the vent system. These door direct air to the different vent locations. The actuators can be ran by vacuums or...

Q: Engine light came on and the gas cap is stuck

Hello. Your particular vehicle has what is known as the smart pin which will lock the gas when the vehicle itself is locked. If you unlock the vehicle with the key fob, the pin should disengage and you will be...

Q: Hello 2006 model Hummer car's fuel consumption too high

Hello: In most cases, the OBD-II error code you wrote down in your question is related to a faulty crankshaft position sensor. When this component is damaged, it can impact the ignition timing of the engine, causing increased fuel consumption,...

Related articles

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...