Honda Pilot Alternator Replacement Guide for 2017-2022 Models
Experiencing flickering lights or a 'Check Charging System' warning? This guide covers your aftermarket alternator options.
- The 'Check Charging System' light, flickering lights, and slow accessories are key signs of a failing alternator in your Pilot.
- For best results, choose a premium aftermarket alternator from Denso, the original equipment manufacturer.
- Check for Honda TSB 18-010; your electrical issues might be a simple loose screw, not a failed alternator.
- Due to the Auto Start-Stop feature, a high-quality, reliable alternator is critical for 2017-2022 Pilot models.
Is Your Honda Pilot's Alternator Failing?
When your Pilot's alternator starts to wear out, it can't produce enough electricity to meet the vehicle's demands. This can be mistaken for a battery problem, but there are specific signs to watch for. Ignoring them can leave you stranded, as the vehicle will eventually lose all electrical power once the battery is drained.
Key Failure Symptoms:
- Battery or 'Check Charging System' Light: This is the most direct warning. A light on your dashboard indicates a problem within the charging system. In some cases, a faulty battery sensor can trigger this light, so a full system diagnosis is recommended.
- Dimming or Flickering Lights: You might notice the headlights and interior lights flicker or dim, especially when you use other accessories like the power windows. This happens because the alternator can't provide a consistent supply of power.
- Slow or Malfunctioning Accessories: Power windows that move slowly, a weak blower fan, or a glitchy infotainment screen can all point to a lack of sufficient electrical power from a failing alternator.
- Whining or Grinding Noises: A high-pitched whining sound that changes with engine speed often indicates worn-out bearings inside the alternator.
- Engine Stalling or Trouble Starting: While many issues can cause stalling, a weak alternator can fail to provide enough power to the spark plugs, leading to stalling. It can also prevent the Auto Start-Stop system from restarting the engine.
Known Issue: Loose Alternator B+ Sensing Screw
Honda issued Technical Service Bulletin (TSB) 18-010 for some 2016-2017 Pilot models. The symptom is flickering lights, jerky steering, and multiple warning indicators. The cause is a B+ sensing screw on the alternator that was not properly torqued from the factory. The fix is to simply tighten the screw to the correct specification (2 N·m). 🎬 Watch: This video shows the easy TSB fix for flickering lights. Before replacing your alternator, it's worth checking if this simple fix applies to your vehicle.
Choosing the Right Aftermarket Alternator
When replacing the alternator on your Pilot, you have several options outside of the expensive dealership part. The original alternator is made by Denso, which also sells parts on the aftermarket. Understanding the different quality tiers can help you make the best choice for your budget and needs.
Premium Aftermarket (OEM Supplier)
- Denso: As the Original Equipment Manufacturer (OEM), a new or remanufactured Denso alternator is generally considered the highest quality replacement. It is designed to the exact specifications for your Pilot's demanding electrical system. Reviews for Denso remanufactured units are consistently positive, with many stating they are visually and functionally identical to the original part.
Standard Aftermarket
- MPA (Motorcar Parts of America): MPA is a large North American supplier that offers new and remanufactured alternators under its Quality-Built (QB) brand. They are designed to meet or exceed original specifications and are 100% end-of-line tested. This brand represents a solid balance of quality and value.
- BBB Industries: BBB Industries is a major remanufacturer that supplies parts to many large auto parts stores. While they offer a cost-effective solution, online forum discussions show mixed experiences, with some users reporting premature bearing failure. They can be a viable budget option, but the quality may not be as consistent as a premium brand like Denso.
Pro Tip: Many modern Honda vehicles use a dual-mode charging system that only produces a higher voltage (around 14V) when there's a significant electrical load. At idle with no accessories on, the system may only show around 12V. Don't immediately assume the alternator is bad based on a simple voltage test at idle; turn on the headlights and A/C to properly test its output.
🎬 See how to properly test your alternator and battery light.Honda Pilot Alternator Replacement Cost
The cost to replace the alternator can vary significantly based on the part you choose and labor rates in your area. The job is moderately difficult and typically takes a professional mechanic 2-3 hours.
| Item | Estimated Cost |
|---|---|
| New OEM Honda Alternator | $680 - $1,005 |
| New Aftermarket Alternator | $161 - $402 |
| Shop Labor | $415 - $609 |
| Total Professional Replacement (Aftermarket) | $576 - $1,011 |
Frequently Asked Questions
Are there any recalls for the 2017-2022 Honda Pilot alternator?
No, there are no specific recalls for the alternator itself. However, NHTSA has an ongoing investigation into the Auto Start-Stop feature on 2016-2020 Pilots, where the engine may fail to restart. While not directly an alternator recall, this issue is related to the vehicle's electrical and charging system. Some owners reported needing a jump-start to get the vehicle running again after a failure.
Can I drive my Pilot with a bad alternator?
It is not recommended. A failing alternator will not recharge the battery. Your Pilot will run off the battery's stored power for a short time until it is completely drained, at which point the engine will shut off, and you will be stranded.
Is it hard to replace the alternator on a 2017-2022 Pilot?
It is a moderately difficult job. The alternator is located in a tight space on the passenger side of the engine. The process involves disconnecting the battery, removing the serpentine belt, unbolting several components for access, and then removing the alternator itself. While possible for an experienced DIYer with the right tools, it can be challenging due to the limited space.
🎬 Watch this step-by-step walkthrough of the alternator replacement process.Should I replace the battery at the same time as the alternator?
It's a good idea to have the battery tested. A failing alternator can damage a battery by undercharging it, and a battery with a bad cell can overwork and destroy a new alternator. If the battery is over four years old or fails a load test, replacing both at the same time is a wise investment.
What is the OEM part number for the 2017-2022 Pilot alternator?
The most common OEM part number for this generation is 31100-5J6-A01, which has been superseded by 31100-5J6-A51. Always confirm fitment with your vehicle's VIN.
Helpful Videos
Technical Specifications
OEM Part Numbers: 31100-5J6-A01 31100-5J6-A51
Voltage: 12V, Amperage: 155A, Rotation: Clockwise, Pulley: 6-Groove Clutch Pulley.
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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.
- Honda Pilot:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Honda Pilot's Alternator Failing?
- Key Failure Symptoms:
- Known Issue: Loose Alternator B+ Sensing Screw
- Choosing the Right Aftermarket Alternator
- Premium Aftermarket (OEM Supplier)
- Standard Aftermarket
- Honda Pilot Alternator Replacement Cost
- Frequently Asked Questions
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