Skip the auto shop - Our mechanics make house calls

Q: Serpentine belt keeps shredding

asked by on

The serpentine belt keeps shredding off on the engine side (one groove at a time). I replaced both the number two idler pulleys that were making noise. Not sure why the belt is still coming apart. I think it might be the belt tensioner.

A: Hi. A malfunctioning belt tensioner is like...

Hi. A malfunctioning belt tensioner is likely, as well as other component along the belt drive system, to cause failure with the belt. Have a technician remove the belt and make sure all of the other components spin freely at the pulley. The technician will be able to determine if the belt is shredding due to misalignment. The repair cannot be complete without replacing the shredded belt as well. Once the drive belt starts to deteriorate, its life is shortened dramatically. If you need further assistance, I recommend you have a certified technician, like one from YourMechanic, replace the serpentine belt and inspect the pulleys to make sure they are not extremely hard to move, as this can cause your belt to deteriorate.

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: squeaky idler pulley

Replace the entire tensioner assembly since the tension is what caused the pulley to go bad. You should also replace the belt if any damage is noted.

Q: Transmission slips

The transmission may be slipping internally from a bad clutch servo or it has an internal seal leak. Have the transmission tested for proper pressures to see if it is a solenoid issue or the seals are leaking causing it...

Q: 4 hours to change serpentine and accessories belts?

As you may know, many mechanics and shops have varying labor rates that depend heavily on the skill set of the mechanics and the various costs associated with running that particular shop. I would recommend having an expert from YourMechanic...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...