Q: Serpentine belt broke

asked by on

My Serpentine belt broke while driving and battery light came on. Drove 15 miles before i arrived home and shut car off. Tried to restart but it the battery was dead. Woke up in the morning car started just fine. I let the car run without driving and After about 7 mins car died again not completely. I shut it off and tried to restart and it was like the battery was dead. Its the orginal serpentine belt from mfg. So its 120,000 miles in. All pulleys seemed to be fine prior as i lifted my hood and never hear squeaks or see signs of the belt tensioners needing to be replaced. Should i still replace all belt tensioners? Is this a Sign of a faulty alternator?.

My car has 120000 miles.
My car has an automatic transmission.

Hello. Yes, the idler pulley and tensioner should be replaced with the serpentine belt. The bearing in the idler pulley wears out over the miles and the tensioner weakens with use as well.

This is not a sign of a faulty alternator. The battery is capable of running engine electronics for a short distance and you were probably most fortunate to get home before that occurred. I am very surprised you did not have an overheating event, as the serpentine belt also drives the water pump. Driving any distance (let’s say a mile) usually causes severe overheating.

If you would like to have this checked, a certified professional from YourMechanic can come to your car’s location to replace the serpentine belt and any other repair that is needed.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Serpentine belt broke

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: I heard a loud pop when driving on the expressway then noticed my C/H gague was going all the way up to the H do you think you can

This sounds like you broke the serpentine belt for the water pump, or one of the hoses came off, causing a loss of coolant, and the engine to overheat. Have the overheating issue diagnosed, and have the serpentine belt replaced,...

Q: Washer fluid not coming out

Hi. The windshield washer reservoir would need to be inspected to see if the reservoir is cracked. Other issues could be that the level sensor, pump motor or seals are starting to fail. I would recommend you have a mechanic,...

Q: Intake manifold swirl flap leaking air and control bar as come off 2007 Saab 9-3

Hello - this "intake swirl runner" problem may require removal, and repair or possibly replacement, of the intake manifold. The "swirl flaps" are internal to the intake manifold, and work to keep air velocity high during low speed operation for...

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...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.