Your engine squeals at a cold start or when the A/C comes on, or the shop showed you a cracked belt and a tensioner that wobbles. You want to know what the fix costs before you say yes.
So how much does it cost to replace a serpentine belt and tensioner? About $300 to $650, by the price page of a repair shop in Austin, Texas. The belt alone is $150 to $350 there.
Owners paid or were quoted $400 to $750 at dealers for a new tensioner, pulleys or belt. With the carmakers’ own parts and job times at the average US shop rate, the same kind of job comes to $171.32 to $220.59.
In this guide I will show you what a shop charges, what the carmakers’ parts and job times come to, which tensioner has a known leak, what owners paid, and how to tell the belt is going.
What a Shop Charges
Luxury Auto Works, a repair shop in Austin that works on luxury and imported cars, lists these prices on its page updated in February 2026:
The shop adds $100 to $350 in parts and 0.5 to 1.0 hour of labor when the tensioner or idler pulleys are replaced too. It says most belt jobs take 30 to 90 minutes.
What the Carmakers’ Parts and Times Come To
Carmakers put their own job times in their service bulletins. Here are four of those bulletins, with their own parts on dealer parts websites, checked October 9, 2026, and $132 an hour, the average US shop rate Tekmetric found in June 2026:
So at the carmakers’ own times the job comes to about $171 to $221 at the average rate. Shops and dealers charge more, as the owners’ bills below show.
Mazda’s Leaking Tensioner
Mazda’s bulletin 01-019/19, revised in June 2023, covers oil leaking from the belt tensioner and a rattle from the engine bay on many 2013 to 2019 Mazdas, and on early 2020 to 2021 CX-30s.
It names the 2013 to 2019 CX-5, the 2016 to 2019 CX-9 and CX-3, the 2014 to 2019 Mazda3 and Mazda6, and the 2016 to 2019 MX-5. The fix is a redesigned tensioner, PE03-15-980C.
Mazda covers it only within its new car warranty. After that, dealers quoted the owners of two 2016 CX-5s $400 and $400 for the leaking tensioner, in complaints filed in 2020.
What Owners Paid
Here is what owners shared on two forums and told NHTSA, the US road safety agency, with a link to each:
- A Toyota dealer asked $247 for the tensioner, $39 for the belt and $210 for labor on a 2013 Camry SE four cylinder, $496 in all, in April 2025. A local mechanic offered a Litens tensioner for $161.
- A dealer wanted $750 to replace all the idler pulleys and the belt of a Tacoma with 22,000 miles, in May 2023.
- Two Mazda dealers quoted $400 each for the leaking tensioner of a 2016 CX-5, in 2020.
- The owner of a 2011 Dodge Charger paid $450 to fix a serpentine belt that kept coming off, filed in April 2016.
So owners paid or were quoted $400 to $750 at dealers. On the Tacoma, members doubted that all the pulleys were bad at 22,000 miles, so ask the shop to show you which part makes the noise.
Signs Your Belt or Tensioner Is Going
The Austin shop lists squealing or chirping at a cold start or when the A/C comes on, and cracks, fraying, a shiny glazed belt or missing ribs.
Heavy steering now and then, a battery light and a temperature that creeps up in traffic point the same way.
It treats fraying, missing chunks or visible cords as urgent, because on many engines the belt also drives the water pump, and a broken belt can overheat the engine.
With the engine off, the shop spins the tensioner and idler pulleys by hand. Any roughness or wobble means they get replaced too, since a weak tensioner can shred a new belt.
GM’s bulletin for the Buick Regal has its technicians take the belt off and listen first. If the noise is gone, the belt and tensioner are replaced. I advise you to ask your shop if it did that check.
Many carmakers list a new belt at 60,000 to 100,000 miles. The Austin shop checks it at every oil change after 50,000 miles and plans a new one around 60,000 to 80,000.
Serpentine Belt Questions You Might Have
How much does it cost to replace a serpentine belt and tensioner?
About $300 to $650 at a shop in Austin, Texas, and owners paid or were quoted $400 to $750 at dealers. With the carmakers’ own parts and job times at $132 an hour it comes to about $171 to $221.
How much is it to replace just the serpentine belt?
$150 to $350 at the Austin shop, and the belt itself is $30 to $120.
How long does it take to replace a serpentine belt and tensioner?
The carmakers’ own times are 0.3 to 0.9 hour: Mazda pays 0.3 to 0.4 hour for the tensioner, GM 0.6 hour and Chrysler 0.9 hour for the belt and tensioner.
Should I replace the tensioner with the belt?
Only if it is weak, rough or leaking. A weak tensioner can ruin a new belt, so ask the shop to check it whenever the belt comes off.
What happens if a serpentine belt breaks?
The belt drives the alternator and often the water pump, so a broken belt can mean a dead battery and an overheated engine. Chrysler’s bulletin for the Pacifica Hybrid warns of exactly that.
Where These Prices Come From
- Luxury Auto Works, Serpentine Belt Replacement, Austin, Texas, updated February 23, 2026.
- Mazda bulletin 01-019/19 (November 2019, revised June 2023), Chrysler bulletin 09-004-23 (February 2023) and bulletin 07-001-16 (January 2016), and GM bulletin PI1173 (February 2014), on NHTSA’s website.
- Part prices on dealer parts websites, checked October 9, 2026: MazdaPartsNow PE03-15-980C, MoparPartsGiant 5281296AA, 5281615AA and 4627533AC, GMPartsGiant 12653318 and 12605175.
- Tekmetric, Average Auto Repair Labor Rates by State, June 30, 2026, and the owner posts and complaints to NHTSA linked above, read October 9, 2026.
I hope this helps you fix the squeal without paying for parts your engine does not need. If you have any questions, you can email me at costcheckr@gmail.com.
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