Skip the auto shop - Our mechanics make house calls

Q: Serpentine belt came off

asked by on

The serpentine belt came off all of the pulleys except one. It is the biggest pulley on the bottom left side.

A: A thrown belt is generally caused by either...

A thrown belt is generally caused by either a seized peripheral - such as an alternator - AC compressor, or possibly a faulty tensioner or idler pulley. It is often suggested that if a belt has been thrown, that the belt be replaced, if all pulleys and peripherals check out fine. It is imperative that the belt be routed correctly, and installed properly, on each of the pulleys' guide tracks. You may want to enlist the help of a mechanic, such as one from YourMechanic, who can inspect all of the pulleys and drive items, and who can also properly install a belt to prevent damage from the belt being thrown in the future.

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・Save up to 30%

Get a quote

What others are asking

Q: Power steering - 2007 Pontiac Grand Prix

Hi. It is very difficult to tell you size of the belts that would needed to eliminate the power steering pump without measuring some things on the car. If I had to guess, you may need a belt that is...

Q: I'm on the side of the road, the tension pulley bolt came loose now it won't go back in

Look at the threads to see if the bolt is left hand threads, or standard right hand threads. If the threads are damaged, then use a thread chaser to clean them out. If the pulley bearings seized, it may have...

Q: Front left tire shakes during braking

You may have a warped rotor, this can be checked with a dial indicator to measure the runout of the suspecting rotor. If the rotor is okay then you may have an ABS problem with the wheel sensor causing the...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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...