Most Common Belt Repair

Serpentine Belt Replacement Cost: $100 to $400

Updated March 2026

Belt only: $100-$250. Belt with tensioner: $150-$400. One of the cheapest and most important engine repairs you will ever do.

Belt part: $20-$50Labor: $80-$200With tensioner: $150-$400

Quick Answer

$100-$250

Belt only

$20-50 part + $80-200 labor

$150-$400

Belt + tensioner

$60-150 parts + $100-300 labor

$15-$50

DIY cost

Parts only, 30-60 minutes

What Does the Serpentine Belt Do?

Updated March 2026

The serpentine belt is a single long rubber belt that drives nearly every accessory on your engine from one source: the crankshaft pulley. Before serpentine belts existed, each accessory had its own separate belt. Now one belt handles everything.

When it snaps, you lose everything at once. That is both the efficiency and the risk.

Alternator

Battery stops charging. Car dies within minutes.

Power Steering Pump

Steering becomes very heavy immediately.

Air Conditioning

AC stops working.

Water Pump

Engine overheats fast. Pull over.

Power Brake Booster

Brakes still work but feel harder.

Air Pump (some cars)

Emissions system affected.

Belt Only vs Belt + Tensioner

Updated March 2026

Belt Only

Belt part cost$20-$50

Labor$80-$200

Total$100-$250

Reasonable if the tensioner is under 60,000 miles and shows no signs of wear.

Belt + Tensioner

Recommended over 100k miles

Parts (belt + tensioner)$60-$150

Labor$100-$300

Total$150-$400

Always replace the tensioner if the car has over 100,000 miles. A worn tensioner kills new belts. The labor is already done so it costs almost nothing to add.

Warning Signs Your Belt Needs Replacing

Updated March 2026

Squealing on startup

Especially when cold or wet. A loose or worn belt slips on the pulleys and squeals. Gets worse in rain.

Visible cracks or fraying

Look at the belt with a torch. Small cracks across the ribs are normal on old belts. Chunks missing or fraying is urgent.

AC stops working

If the AC compressor suddenly stops and the belt looks fine, the belt may be slipping rather than turning the AC pulley.

Power steering suddenly heavy

If the steering goes stiff suddenly at low speed, the belt may have broken or slipped off the power steering pump pulley.

Battery warning light

The alternator is belt-driven. If the belt slips or breaks, the alternator stops charging and the battery light comes on.

High mileage (over 60k-100k)

Most manufacturers recommend replacing the serpentine belt every 60,000-100,000 miles even with no symptoms.

Cost by Vehicle

Updated March 2026

Vehicle	Belt Only	Belt + Tensioner
Toyota Camry	$110-$190	$180-$310
Honda Accord	$100-$180	$160-$290
Ford F-150	$130-$230	$200-$380
Chevrolet Silverado	$140-$250	$220-$400
BMW 3 Series	$180-$320	$280-$500
Honda Civic	$90-$160	$150-$260

Prices are estimates at independent shops. Dealer labor rates typically add 20-40%. European vehicles cost more due to parts availability and labor complexity.

DIY Guide: Easy to Moderate

Updated March 2026

Good news: this is one of the easier engine repairs

No special knowledge required. The routing diagram is usually on a sticker under the hood or in the owner manual. Most cars take 30-60 minutes. You save $80-$200 in labor.

Take a photo first

Before touching anything, photograph the belt routing from multiple angles. The routing diagram sticker under the hood fades over time. Your photo is your safety net.

Get the right tool

You need a serpentine belt tool ($15 at any auto parts store) or a long-handled breaker bar. The tensioner pulley has a square socket that you push to release tension. Do not try to do this without the right tool.

Release the tensioner

Insert the tool into the tensioner, push to release tension on the belt, and slip the belt off one pulley. The tensioner is spring-loaded so hold it firmly.

Route the new belt

Follow your photo and the sticker. The ribbed side of the belt goes against ribbed pulleys. The smooth side goes against smooth idler pulleys. Getting this wrong makes the belt squeal instantly.

Check the tensioner

Spin each pulley by hand with the belt off. Any grinding, wobbling, or roughness means the tensioner or idler pulley needs replacing too. Parts are $20-$50 each.

Start the engine and check

Run the engine for 30 seconds. The belt should run smoothly without squealing. Turn on the AC to load the belt. Any squealing means a routing error or a worn tensioner.

Frequently Asked Questions

How much does a serpentine belt replacement cost?

A serpentine belt replacement costs $100-$250 total at most shops. The belt itself is $20-$50 in parts. Labor runs $80-$200. If you replace the tensioner at the same time, expect $150-$400 total.

Should I replace the tensioner when replacing the serpentine belt?

Yes, if your vehicle has more than 100,000 miles. The tensioner is what keeps the belt tight. A worn tensioner will cause a new belt to slip or fail prematurely. The labor is already done, so replacing both at the same time is much cheaper than two separate jobs.

What happens if the serpentine belt breaks while driving?

If the serpentine belt breaks, you lose power steering immediately, the alternator stops charging the battery, the water pump stops cooling the engine, and AC stops working. The car will run for a few minutes on battery but will overheat quickly. Pull over immediately.

Can I drive with a squealing serpentine belt?

A squealing belt is a warning sign, not a reason to stop immediately, but you should get it checked within a few days. Squealing usually means the belt is worn, cracked, or the tensioner is loose. If you ignore it, the belt can fail without further warning.