Estimates Starting and Charging Alternator Replacement

Volvo S40 Alternator Replacement

An alternator generates electric power in a car and is a major component of the car's charging system. Replacement costs depend on the year, make, and model of the car.

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Our repairs come with:

Certified Mechanics  •  
12-Month | 12,000-Mile Warranty

Easy Online Booking  •  7 Days a Week

Volvo S40 Alternator Replacement

RepairSmith offers upfront and competitive pricing. The average cost for Volvo S40 Alternator Replacement is $600. Drop it off at our shop and pick it up a few hours later, or save time and have our Delivery mechanics come to you.

Quoted on
2004 Volvo S40
2.5L L5 Turbo • 190,000 miles
San Jose CA 95112
Nov 16, 2020
$633 - $773
2006 Volvo S40
2.4L L5 • 13,000 miles
Chandler AZ 85225
Nov 7, 2020
$452 - $552
2006 Volvo S40
2.4L L5 • 181,460 miles
Las Vegas NV 89169
Oct 2, 2020
$444 - $542
2005 Volvo S40
2.5L L5 Turbo • 200,000 miles
Fullerton CA 92832
Aug 21, 2020
$490 - $598
2007 Volvo S40
2.4L L5 2.4i • 129,235 miles
Los Angeles CA 90011
Aug 1, 2020
$626 - $766
2005 Volvo S40
2.4L L5 • 155,000 miles
Rancho Cucamonga CA 91730
Jun 2, 2020
$418 - $510
2006 Volvo S40
2.4L L5 2.4i • 166,266 miles
Sacramento CA 95823
May 22, 2020
$540 - $660
2006 Volvo S40
2.4L L5 • 160,000 miles
Phoenix AZ 85033
May 7, 2020
$497 - $607
2004 Volvo S40
T5 • 113,000 miles
Menifee CA 92584
Jul 1, 2019
$756 - $924
Last Updated:
Dec 15, 2020 8:45 PM
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What is an Alternator?

The alternator is responsible for two things. First, it powers the electrical units when your car is running. The radio, lights, window switches, USB ports, etc., are all powered by the alternator. And second, it recharges the car’s battery, which is the source of electricity when the car is turned off. Your car’s alternator gains power from the engine. It’s connected to the engine via a drive belt, and it converts that energy into usable electricity. It’s a pretty simple system. However, the alternator does need to be regulated, to make sure that nothing is overcharged or undercharged. In older cars, that’s the job of the voltage regulator. In newer cars, the engine control module (ECM) is responsible for those duties.

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Symptoms of a failing Alternator

Car won’t start

When your car is running, the alternator uses energy from the engine to recharge the battery. When the car is off, it needs that electricity from the battery in order to turn back on. If the car won’t turn on, it may be because the alternator isn’t recharging the battery.

Hard starting

Similarly, if the alternator isn’t charging the battery sufficiently, you’ll likely have trouble starting the car, also known as a hard start.


You might think that these issues only arise when starting the vehicle, but a malfunctioning alternator can actually result in stalling when your car is turned on.

Lights that are too bright or too dim

If the alternator is sending too much electricity to the electrical units, your car’s lights will likely be brighter than they’re supposed to be. Conversely, if the alternator isn’t sending enough electricity, then the lights will be too dim.

Whining noise

A busted alternator will often make an annoying whining noise when the engine is running.

Warning lights

A malfunctioning alternator will usually result in a warning light or two illuminating on your dashboard. The check engine warning light and a charging system warning light are most common.

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How urgent is an Alternator replacement?

Usually a faulty alternator won’t cause further damage to the vehicle. However, if it is overcharging or undercharging certain electrical units, it is possible for some damage to occur. A malfunctioning alternator does make your car less reliable, however, due to the potential issues with stalling and starting, so it’s best to get it replaced immediately if you’re starting to notice the above symptoms.

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Car repair can be scary, but it doesn't need to be. RepairSmith is here to make it easy.

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