Skip the auto shop - Our mechanics make house calls

Q: Car not starting, even after jumpstart

asked by on

My car will not start, even after I jumpstart it.

Hello. When a car won’t start, power to the starter motor must be checked, and voltage drops performed. The starter motor is mounted under the intake manifold, so alternative test points must be used to test the starter motor. The larger wire at the starter motor should have 12v at all times, and the smaller wire should have 12v in the Start position. If voltage is good, then a voltage drop should be performed between the battery positive, and the same two wires in the Start position. If the reading is less than 0.5v, the wiring is good, and the starter has failed. If there is a lack of 12v at either wire, then the circuit must be checked to find the open circuit. A certified mechanic, such as one from YourMechanic, can properly diagnose your non-starting issue.

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: my car has a leak in a hose by the water punp i think it is that causes it too overheat and all water i put in goes right back out

Hello. This is a water bypass hose. The water pump will need to be removed and the metal portion of the hose removed in order to replace this hose. It can typically only be purchased from the dealer. If you...

Q: timing cuver

Hi there. If you would like to have one of our mobile mechanics come to your location to complete a timing cover replacement, please click this link and then click the Get a Quote button.

Q: Vehicle scan showed problem with emissions air pump. My air smog pump was filled with liquid

The air pump sucks in outside air in the lower front fender area and the car may have sucked in water while the pump was running. The only way to stop water from entering the air pump is to not...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...