Skip the auto shop - Our mechanics make house calls

Q: car won't start

asked by on

I've got a mercedes c300 2011 that won't start. I believe the battery is okay because when I turn the ignition all electrical components respond quickly as they should. When I turn the ignition I do hear what sounds like the starter motor spinning without engaging the flywheel. I have verified fuses that I believe are associated with the starter system and they also appear okay. Is this more than likely a bad solenoid?

My car has 50000 miles.
My car has an automatic transmission.

A: When the solenoid is energized, the pinion ...

When the solenoid is energized, the pinion gear is forced out by a plunger or lever to mesh with the ring gear. If the starter motor is spinning, freely, without the pinion gear engaging the flywheel, then something is wrong with the pinion gear assembly (lever, etc.) within the solenoid. Prior to condemning the starter though (best to replace starter/solenoid as one assembly) be sure that the solenoid is indeed getting 12.6 volt power, with NO voltage drop, when you turn the key to the start position. If your Mercedes Benz dealer sells rebuilt starters, that is the recommended source for this starter unless you have identified a reputable supplier in the aftermarket. Should you desire that a certified professional from YourMechanic diagnose this no start issue, and if necessary procure and replace the starter, by all means please schedule a mobile visit to get this taken care of.

Was this answer helpful?
Recommended services
Get a Quote

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・Save up to 30%

Get a quote

What others are asking

Q: At what mm MUST I replace rear brakes?

Hello, thanks for your question. I would consider 3 mm to be the thickness that I would recommend for replacing the brakes. Some vehicles start out thinner than other vehicles, but under 3 mm is what most mechanics would consider...

Q: Sunroof and trunk not closing

It could be that the top needs to have its position relearned with an OEM compatible scan tool. The problem could also be with the top control module or one of its inputs. Finally, there could be a mechanical problem...

Q: How much time does it take a starter on a 2011 chrysler town and country 3.6

Hello, thanks for writing in about your Chrysler Town & Country. The book time for this is 2.6 hours. This time does not include testing. If you need to have your starter replaced, consider YourMechanic, as one of our certified...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.