Skip the auto shop - Our mechanics make house calls

Q: Vehicle will sometimes turn over, but not start

asked by on

Sometimes my vehicle will turn over, but it won’t start. The crank sensor was replaced and a local import repair shop reported that they think it to be the main computer because the fuel pump is getting too much. Randomly the vehicle will start over and over, but other times it only turns and won’t start. Can you tell me what could be causing this?

A: Based on your description, it sounds like y...

Based on your description, it sounds like your 2007 Mercedes GL450’s fuel pump may be randomly shutting off. This can be due to a malfunctioning powertrain control module as the repair shop told you. This can also be related to a faulty fuel pump, loose wire, faulty fuel pump relay, faulty ignition switch, or a clogged fuel filter.

I would recommend having your fuel pump’s electrical circuit inspected for damages and tested with a digital multimeter in various locations to determine if the circuit is performing its intended purpose. If any damaged wires are located, they should be replaced immediately as this can cause the symptoms you are having. It is also very important to check near the power distribution center under your hood for the fuel pump relay and see if any damages are found there as well. A certified technician from YourMechanic can diagnose your starting issue if you need further help.

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: Front end car noise at 15 mph and over on 2007 BMW 530xi

Hello. It's a little difficult for me to pinpoint that type of noise you are hearing over the net. The noise you are describing likely has to do with a braking issue, such as low brake pads or a suspension...

Q: Engine kicking on startup when it's cold

The first thing you'd want to do is check the ignition timing. It is possible that it is too far advanced. If it is too far advanced, odds are, it's going to need a timing chain, which can be...

Q: Bad computer in a jeep grand cherokee

I would not take anyone's word on the problem and look into it further. Find out why they did not get it replaced to sell the vehicle? If you decide you want to chance purchasing it then get pricing first...

Related articles

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...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...