Skip the auto shop - Our mechanics make house calls

Q: car will crank battery fine but will only start with jump leads

asked by on

Battery fine car will crank but will only start with jump leads,only happens on cold morning s,once started drives fine but if left for long period of Tim e h ave to use jump leads again

My car has 166000 miles.
My car has a manual transmission.

A: Hi there: If you’re having these issues on...

Hi there:

If you’re having these issues only when it’s really cold outside, it’s possible that the battery is low on cold cranking amps. Batteries are measured in cold cranking amps which is the amount of amperage the battery can produce at 0 degrees. If the cold cranking amps of your battery are not up to what they should be, the vehicle may not be able to start in those colder temperatures.This is not tested during a typical battery test; which can be the reason why it’s assumed the battery is OK. If you replace the battery and still have these issues, you should have a mobile mechanic complete a car is hard to start inspection.

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: Truck will not start, just turns over - 2002 Dodge Ram 1500

Hi there. It looks as if you've checked multiple components except for the the starter or starter relay. In most cases, like you've described, the issue of not being able to crank an engine over is caused by a bad...

Q: Hole in engine. What's a probable cause for this?

It sounds as though there's no option for this car other than engine replacement. A catastrophic failure like that usually only results after the car has been driven with internal problems like main or rod bearing failure. There was probably...

Q: Issues when accelerating from a stop

This may be a sign of low transmission fluid or a faulty transmission control solenoid. As you know, automatic transmissions use pressurized hydraulic fluid to change gears. Every time a gear change is required, the car's computer activates a transmission...

Related articles

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 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...
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...