Chevrolet Impala Alternator Guide (2012-2020): Choosing a Replacement
Keep your 2012-2020 Impala's electrical system healthy by understanding alternator failure and choosing the right replacement part.
- Verify your Impala's generation (9th gen: 2012-13 & Limited vs. 10th gen: 2014-20) before buying, as the parts are different.
- Common failure signs include a 'Service Charging System' message, dimming lights, and whining noises.
- For best reliability, choose a new or remanufactured alternator from a premium brand like ACDelco, Denso, or Bosch.
- DIY replacement is feasible for those with moderate mechanical skill and can save over $100 in labor costs.
Understanding Alternator Failure in Your Impala
When your Impala's alternator starts to fail, it can't produce enough electricity to power the car and charge the battery. This leads to a variety of electrical problems. Often, the first sign is a 'Service Battery Charging System' message or a battery-shaped warning light on your dashboard. You might also notice your headlights and interior lights dimming or flickering, especially at idle. Other symptoms include strange noises, a dead battery, or even the engine stalling.
🎬 Watch this guide on diagnosing a failed alternator no-start issue.A Note on Impala Generations (2012-2020)
This year range covers two different versions of the Impala. The 2012-2013 Impala and the fleet-model 2014-2016 Impala Limited belong to the 9th generation. The completely redesigned 2014-2020 Impala is the 10th generation. These cars use different engines (like the 2.5L 4-cylinder and 3.6L V6) and have different alternators. 🎬 Watch: Step-by-step alternator replacement for the 3.6L V6 engine. Always confirm your exact year and model before ordering a part.
Choosing the Right Aftermarket Alternator
When replacing your alternator, you have several options beyond the expensive dealership part. Aftermarket brands offer a range of quality and price points. Here’s how they generally stack up for your Impala:
Tier 1: Premium Aftermarket & OEM Suppliers
These brands are known for high quality, often rivaling or exceeding original equipment standards. They are an excellent choice for owners who want long-term reliability.
- ACDelco: As GM's official parts brand, ACDelco is a trusted choice. Their 'Gold' (formerly Professional) line is considered a top-tier replacement, while their 'Silver' line offers a more budget-friendly but still reliable option.
- Denso: Denso is a major OEM supplier for many automakers and is widely regarded as one of the best aftermarket brands for reliability and performance.
- Bosch: Bosch has a long reputation for quality electrical components. Both their new and remanufactured units are considered a solid choice, often backed by good warranties.
Tier 2: Standard Aftermarket Replacements
These brands provide a good balance of cost and quality. They are a popular choice for daily drivers and a significant step up from basic, unbranded parts.
- Remy (Delco Remy): A historic brand, Remy offers both new and remanufactured alternators. Quality is generally considered good, though some users report occasional issues with remanufactured units.
- WAI Global: WAI is a large aftermarket manufacturer offering new alternators that are a common replacement option.
- MPA (Motorcar Parts of America): MPA produces the Quality-Built and Pure Energy lines. They focus on testing to meet or exceed OE specs.
Tier 3: Value-Oriented Brands
- BBB Industries: This company is a major remanufacturer, supplying parts under various names. They offer a cost-effective solution, but as with many value-focused remanufactured parts, quality can sometimes be inconsistent.
Pro Tip: New vs. Remanufactured
A 'new' aftermarket alternator is made with all-new components. A 'remanufactured' (or 'reman') alternator has been completely disassembled, cleaned, and rebuilt with new wear items like bearings and brushes. High-quality remanufactured units from brands like Bosch or Denso can be very reliable, while cheaper ones can be a gamble.
Cost of Replacing a Chevrolet Impala Alternator
The cost depends on the part you choose and who does the work. Doing it yourself can save a lot on labor. Shop labor costs for this job are typically estimated to be between $114 and $168.
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket | $186 - $680 |
| Remanufactured Aftermarket | $210 - $370 |
| Shop Labor | $114 - $168 |
| Total Professional Replacement | $519 - $800+ |
Frequently Asked Questions
Can I replace the alternator myself?
For a moderately experienced DIY mechanic, yes. The alternator on both the 2.5L and 3.6L engines 🎬 See how to locate and replace the 2.5L engine alternator. is accessible from the top of the engine bay. The process involves disconnecting the battery, removing the serpentine belt, unplugging the electrical connectors, and unbolting the alternator. It typically requires basic hand tools like sockets and wrenches. Estimated time is 1-2 hours.
What is a 'core charge'?
When you buy a remanufactured alternator, you'll often pay a 'core charge,' which is a refundable deposit. You get this money back when you return your old, failed alternator (the 'core') to the parts store. This allows the manufacturer to rebuild it for a future customer.
Are there any recalls for the Impala alternator?
As of early 2026, there are no specific NHTSA recalls for alternator failure on the 2012-2020 Chevrolet Impala. However, a Technical Service Bulletin (TSB), PIC6017A, was issued for some 2015 Impalas with the 2.5L engine for an intermittent 'Service Charging System' message, which could be related to the alternator system.
How long should a new alternator last?
A quality new or premium remanufactured alternator should last for many years, often 80,000 to 150,000 miles, similar to the original part. However, factors like driving conditions, electrical load (from accessories like large stereos), and exposure to engine oil leaks can shorten its lifespan.
Helpful Videos
Technical Specifications
Amperage: 150A or 170A depending on model and options. Voltage: 12V. Pulley: 6-Groove Pulley. Rotation: Clockwise.
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.
- Chevrolet Impala: