A Deep Dive into the 2016-2024 Hyundai Sonata Alternator
Everything a Sonata owner needs to know when their alternator fails, from symptoms to choosing the right replacement part.
- The best aftermarket choice is a new alternator from Mando, the Original Equipment (OE) supplier for Hyundai.
- Symptoms often start with electrical glitches like dimming lights or slow power windows before the car fails to start.
- If you have a 2015-2017 Sonata with the 1.6L Turbo engine, be aware of a TSB regarding the alternator mounting bolt.
- Replacing the serpentine belt at the same time is a smart and cost-effective decision.
Is Your Sonata's Alternator Failing?
An alternator doesn't usually fail without warning. For a 2016-2024 Hyundai Sonata, the signs are often electrical. Your car's computer is smart; if power is low, it will start shutting down non-essential items first. Look for these common symptoms before the part fails completely.
Key Failure Symptoms:
- Battery Warning Light: The most obvious sign is the battery-shaped warning light on your dashboard. This light indicates a problem in the charging system.
- Dimming or Flickering Lights: Headlights and interior dash lights may flicker, or appear dimmer or brighter than usual. This happens because the alternator isn't providing a steady flow of electricity.
- Slow or Malfunctioning Accessories: You might notice your power windows move slower, your radio cuts out, or your heated seats don't get warm. These are early signs that there isn't enough power to go around.
- Whining or Grinding Noises: A failing alternator often makes a whining or grinding sound that changes with engine speed. This is usually caused by worn-out internal bearings.
- Difficulty Starting or Stalling: If the alternator isn't recharging the battery, your car may struggle to start. In some cases, the engine can stall while driving because the spark plugs aren't getting enough power. 🎬 See how to diagnose a no-start issue and check your battery.
Pro Tip: The Voltmeter Test
🎬 Watch this quick video to see how to test your alternator.You can test your charging system with a simple voltmeter. A healthy, fully charged Sonata battery should read between 12.4 and 12.7 volts with the engine off. After starting the engine, the reading should jump to between 13.7 and 14.7 volts. If the voltage is low with the engine running, the alternator is likely failing. If it's too high, the voltage regulator (usually inside the alternator) is bad.
Known Issues for 2016-2024 Hyundai Sonata
While there are no major, widespread alternator recalls for this generation of Sonata, there is a specific Technical Service Bulletin (TSB) worth noting.
TSB: Alternator Mounting Bolt (2015-2017 1.6L Turbo)
Hyundai issued Service Campaign TTT for some 2015-2017 Sonatas with the 1.6L Turbo engine. This campaign addresses an issue with the top alternator mounting bolt, which could require replacement. If you have one of these specific models, it's worth checking if this service was performed.
Choosing the Right Aftermarket Alternator
When replacing your alternator, you don't have to buy the expensive part from the dealer. Aftermarket brands offer a range of quality and price points. For your Sonata, the choice is clear.
Tier 1: OE Supplier (Best Choice)
- Mando: Mando (now HL Mando) is the Original Equipment (OE) manufacturer for many Hyundai and Kia parts, including the alternator. Choosing a new Mando alternator means you are getting the exact same part, quality, and fitment that your car was built with, but at a lower price than the dealer-branded box. This is a brand new part, not remanufactured.
Tier 2: Reputable Aftermarket Brands
- MPA (Motorcar Parts of America): MPA offers new and remanufactured alternators that are designed to meet or exceed original specifications. They are a reliable choice if an OE part is not available.
- Remy / BBB Industries: Remy is a well-known aftermarket brand now owned by BBB Industries, a major remanufacturer. Quality can be mixed, with some users reporting long life and others experiencing premature failures. They are a common mid-range option.
Tier 3: Economy Brands
- WAI Global: WAI offers some of the most budget-friendly options. However, forum discussions from mechanics and DIYers suggest a higher likelihood of issues like bearing noise or early failure compared to premium brands. Consider this a short-term or budget-focused solution.
Hyundai Sonata Alternator Replacement Cost
The total cost depends on whether you do it yourself or use a repair shop. Shop labor costs for this job are generally reasonable.
| Item | Estimated Cost |
|---|---|
| New OEM Part (Dealer) | $534 - $836 |
| New Aftermarket Part | $227 - $448 |
| Shop Labor | $162 - $238 |
| Total Professional Replacement | $696 - $1,074 |
Frequently Asked Questions
Can I drive my Sonata with a bad alternator?
It is not recommended. Your car will run off the battery, but only for a short time. Once the battery is drained, the engine will stall, and you will be stranded. It's best to get it replaced as soon as you notice symptoms.
Should I buy a new or remanufactured alternator?
For the Hyundai Sonata, a new unit from the OE supplier (Mando) is available on the aftermarket and is the best choice. It offers the highest reliability without the dealer markup. A quality remanufactured part from a brand like MPA or BBB is a viable second option, but a new OE part is preferred when available.
Is replacing the alternator a DIY job?
For someone with moderate mechanical experience, yes. The job typically takes 1-2 hours. It involves removing the serpentine belt, disconnecting the battery, and unbolting the old alternator. Access can be tight, and you may need to remove the passenger-side front wheel and splash shield.
🎬 Follow this step-by-step walkthrough for replacing a Sonata 2.4L alternator.Should I replace the serpentine belt at the same time?
Yes. The serpentine belt has to be removed to replace the alternator, so it's the perfect time to install a new one. Belts are inexpensive and replacing it now saves you from having to do the labor again in the near future.
Helpful Videos
Technical Specifications
OEM Part Numbers: 37300-C1500 37300-C1600 37300-C0100 37300-2GAA0
Amperage ratings for the 2016-2024 Sonata can vary (e.g., 90A, 130A, 150A) depending on the engine and trim level. It is critical to match the amperage of the replacement part to the original unit.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Hyundai Sonata:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Sonata's Alternator Failing?
- Key Failure Symptoms:
- Pro Tip: The Voltmeter Test
- Known Issues for 2016-2024 Hyundai Sonata
- TSB: Alternator Mounting Bolt (2015-2017 1.6L Turbo)
- Choosing the Right Aftermarket Alternator
- Tier 1: OE Supplier (Best Choice)
- Tier 2: Reputable Aftermarket Brands
- Tier 3: Economy Brands
- Hyundai Sonata Alternator Replacement Cost
- Frequently Asked Questions
- 🎟️ Get 5% Off