Skip to content
EN · km
Language
Units
My Garage

Engine Cranks Slowly

A starter that turns the engine slowly and laboriously usually means a weak battery, poor connections or, less often, a worn starter motor.

Normal risk

Not dangerous, but the car may soon fail to start. Test the battery.

Short answer · Why is my engine cranking slowly?

Starting takes a big current. A battery that is old, partly discharged or cold cannot deliver it, so the starter turns slowly. Corroded terminals and a poor engine earth strap have the same effect. If the battery tests well and connections are clean, the starter itself may be worn.

On this page

Safe checks you can do

  1. Measure the battery voltageAbout 12.6 V at rest is healthy; much lower means it is weak or discharged.
  2. Check the terminalsClean and tighten corroded or loose clamps.Never touch both terminals at once with metal tools.
  3. Try a jump startIf it cranks normally with help, the battery is the problem.

Questions that narrow it down

  1. Is it worse in the cold?Typical of a weak battery.
  2. Is the battery older than about five years?Likely near its end.
  3. Short trips only?The battery never fully charges.

Possible causes

Listed without ranking. Use the questions above to see which ones fit your car.

  1. Weak or discharged batteryThe most common cause.
  2. Corroded terminalsHigh resistance.
  3. Poor earth strapBetween engine and body.
  4. Worn starter motorDraws too much current.
  5. Wrong oil viscosityThick oil in cold weather.

Questions about Engine Cranks Slowly

Can a battery charger fix it?

If the battery is just discharged, yes; a worn-out battery will not hold the charge.

Will the car leave me stranded?

Slow cranking is often the last warning before a no-start.