BUICK 84145740 Avenir Rear Housing Fuel Door Filler Tank Lock Actuator

( Manufacturer Part Number: 84145740 ), ( Filler Neck Diameter: Oem ), ( Vintage Part: No ), ( Placement On Vehicle: Trunk, Rear ), ( Type: Fuel Tank ), ( Oe/oem Part Number: 84893074 / 8489-3074 / 8489 3074 )

Review BUICK Avenir Rear Door Housing Fuel Filler Tank Lock Actuator Oem fits ENCLAVE 2018–2023

The **Buick 84145740 18-23 Enclave Avenir Rear Door Housing Fuel Filler Tank Lock Actuator** is a precision-engineered component designed specifically for the rear door assembly of the Buick Enclave and Enclave Avenir models produced between the 2018 and 2023 model years. This critical actuator serves as the mechanical interface between the fuel filler door mechanism and the vehicle s electronic control system, ensuring seamless operation of the fuel filler flap while maintaining security and preventing unauthorized access to the fuel tank. Crafted from high-quality, durable materials, including reinforced plastics and corrosion-resistant metals, this actuator is built to withstand the demands of daily driving, including exposure to varying environmental conditions, temperature fluctuations, and the mechanical stress of repeated engagement and disengagement. The design incorporates a robust solenoid mechanism that, when activated by the vehicle s onboard computer, retracts the fuel filler flap to allow fueling while securely locking it in place when not in use. This actuator is engineered to integrate flawlessly with the existing wiring harness and electronic control module (ECM), ensuring reliable communication and operation. Whether replacing a worn-out or malfunctioning actuator due to electrical failure, mechanical wear, or accidental damage, this genuine OEM part guarantees a perfect fit and optimal performance, restoring the fuel filler system to factory specifications. Its compatibility with the Buick Enclave and Enclave Avenir ensures that it meets the exacting standards of Buick s engineering, providing drivers with the confidence of a seamless, secure, and efficient fueling experience.

Buying the **Buick part number 84145740 (18-23 Enclave Avenir Rear Door Housing Fuel Filler Tank Lock Actuator)** involves weighing several factors, including cost, availability, compatibility, and installation complexity. Below is a detailed breakdown of the pros and cons, followed by a conclusion and recommendation.

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### **Pros of Buying This Part**

1. **Direct OEM Fitment**

The part is an original equipment manufacturer (OEM) component designed specifically for the 2018 2023 Buick Enclave and Avenir models. This ensures a perfect fit with no modifications required, reducing the risk of misalignment or functionality issues. OEM parts are built to the same standards as factory-installed components, which can improve reliability and longevity compared to aftermarket alternatives.

2. **Reliability and Durability**

Since it is an OEM part, it is manufactured to Buick s quality control standards, which generally means fewer early failures or premature wear. This is particularly important for critical components like the fuel filler tank lock actuator, which affects vehicle security and fuel system operation.

3. **Warranty Coverage**

Purchasing from an authorized Buick dealer or a reputable online retailer (such as RockAuto, AutoZone, or parts distributors like Mopar or Carquest) may include a warranty, typically ranging from 6 months to 2 years. This provides peace of mind in case the part fails shortly after installation. Some third-party sellers may offer limited warranties as well, though these vary widely.

4. **Ease of Installation (For Skilled DIYers)**

While the part itself is straightforward, the installation process for the rear door housing and fuel filler tank lock actuator can be moderately complex due to the need to remove the rear door panel, access the fuel tank area, and potentially disconnect wiring or electrical components. However, if you have experience with automotive repairs or access to detailed repair guides (e.g., from Haynes or Chilton manuals), the job is manageable. Many buyers opt for professional installation, which can cost between $100 $200 in labor.

5. **Prevents Future Issues**

If the original actuator failed due to wear, corrosion, or electrical issues, replacing it with an OEM part can prevent recurring problems such as the fuel filler door not locking properly, difficulty opening the fuel cap, or even potential security risks if the lock mechanism is compromised.

6. **Resale Value Protection**

Maintaining the vehicle with OEM parts can help preserve its resale value, especially if you plan to sell the Enclave or Avenir in the future. Buyers often prefer vehicles that have been well-maintained with genuine components.

7. **Access to Technical Support**

Buying from authorized sources may provide access to technical support or troubleshooting assistance if issues arise during installation or after fitting the part. This can be invaluable for diagnosing problems that might not be immediately obvious.

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### **Cons of Buying This Part**

1. **Higher Cost Compared to Aftermarket Alternatives**

OEM parts are typically more expensive than aftermarket equivalents. The price for this Buick actuator can range from **$150 $300 or more**, depending on the retailer and whether it is new or refurbished. Aftermarket parts from brands like ACDelco, Dorman, or TEKO may cost **$50 $120**, though quality and longevity can vary significantly. The cost difference must be weighed against the perceived benefits of OEM quality.

2. **Longer Lead Times**

OEM parts, especially those ordered directly from Buick dealers or large distributors, may have longer lead times compared to aftermarket parts. This can delay repairs if you need the part urgently. Some online retailers offer expedited shipping, but this often comes at an additional cost.

3. **Potential for Counterfeit or Low-Quality Parts**

When purchasing online, there is a risk of receiving a counterfeit or substandard part, particularly from unverified sellers on platforms like eBay or Amazon. Always buy from reputable dealers with positive reviews and clear return policies to mitigate this risk. Checking the part s authenticity (e.g., by verifying the part number and packaging) can help avoid this issue.

4. **Complex Installation Requirements**

The fuel filler tank lock actuator is located behind the rear door panel and near the fuel tank, which requires disassembling parts of the door and potentially working around the fuel system. This can be time-consuming and may require specialized tools (e.g., door panel removal tools, trim removal tools). If you are not comfortable with this level of repair, professional installation is advisable, adding to the overall cost.

5. **Risk of Additional Wear or Damage During Installation**

If the installation is not done carefully, there is a chance of damaging surrounding components, such as the door panel, wiring harness, or fuel tank seals. This could lead to additional repair costs if not handled properly.

6. **Limited Availability of Refurbished or Used Parts**

While some OEM parts may be available refurbished, this option is less common for specialized components like the fuel filler tank lock actuator. Refurbished parts may not come with the same warranty as new ones, and their condition can be unpredictable.

7. **Potential for Overkill for Minor Issues**

If the original actuator failed due to a simple electrical issue (e.g., a blown fuse or corroded wiring) rather than mechanical failure, replacing the entire actuator may be unnecessary. Diagnosing the root cause before purchasing the part can save money and time.

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### **Conclusion**

Buying the **Buick 84145740 (18-23 Enclave Avenir Rear Door Housing Fuel Filler Tank Lock Actuator)** as an OEM part is a sound choice if you prioritize reliability, fitment, and long-term performance. The part is designed to meet Buick s standards, ensuring compatibility and durability, and it comes with the added benefit of warranty coverage from authorized sellers. However, the higher cost and potential complexity of installation must be carefully considered, especially if you are on a tight budget or lack mechanical experience.

For most buyers, the trade-offs are justified if the actuator is a critical component that has failed and needs immediate replacement. If cost is a major concern, aftermarket alternatives can be explored, but they should be thoroughly researched for quality and compatibility. Ultimately, the decision depends on your budget, technical comfort level, and whether you value the peace of mind that comes with an OEM part.

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### **Recommendation**

1. **Verify the Root Cause**: Before purchasing, ensure that the actuator is indeed the faulty component. Check for electrical issues (e.g., fuse, wiring, or relay problems) that might be causing the failure. This can save money if the issue is simpler to fix.

2. **Purchase from a Reputable Source**: Buy the part from an authorized Buick dealer, a trusted online retailer (such as RockAuto, AutoZone, or a parts distributor with good reviews), or a dealership parts department. Avoid unknown sellers to prevent receiving counterfeit or damaged parts.

3. **Consider Aftermarket Options**: If budget is a constraint, compare aftermarket brands like ACDelco, Dorman, or TEKO. Look for parts with high ratings and positive feedback from owners of similar Buick models. Ensure the part number matches your vehicle s specifications.

4. **Plan for Professional Installation**: Unless you are experienced with automotive repairs, consider having the part installed by a professional mechanic. The labor cost will add to the total expense but can prevent mistakes that might void warranties or damage other components.

5. **Check for Warranty Coverage**: Confirm the warranty terms before purchasing. Some sellers offer limited warranties, while others may not. Keep receipts and installation records in case of issues.

6. **Prepare for Installation**: Gather the necessary tools (e.g., trim removal tools, door panel removal aids) and follow a step-by-step repair guide (e.g., from a Haynes manual or YouTube tutorial) to ensure a smooth installation process.

By following these steps, you can make an informed decision that balances cost, quality, and practicality for your Buick Enclave or Avenir.

Details:

All electronics are tested before removed from vehicle. Shipping prices for ground apply only to the continental USA. Item may show light scuffs, scratches or other imperfections as a result of this being used part. All the parts are tested either before or after removal from vehicle.

part #: 84145740 prices

• $33.88-$53.90

specifications fueltanksysteme:

• for models: Enclave
• for makes: Buick
• for years: 2018-2023
• mpn: 84145740
• filler neck diameter: Oem
• vintage part: No
• placement on vehicle: Trunk, Rear
• type: Fuel Tank
• oe/oem part number: 84893074 / 8489-3074 / 8489 3074

shipping fueltanksysteme:

• service: USPS Ground Advantage
• type: Fixed
• class: Standard
• carrier: USPS
• transit: 6-12 Days
• cost: $0.00

offer fueltanksysteme:

• started: February 27, 2026
• quantity: 1
• options: Ship-to-home
• best offers: True
• sold: 0
• availability: In Stock

general fueltanksysteme:

• condition: Used
• Car Truck Parts Accessories > Air Fuel Delivery > Fuel Tanks Filler Necks

seller fueltanksysteme:

• rating: 99.9%
• # reviews: 12663
• city: Yuba City, California

payments fueltanksysteme:

• wallet: Apple-pay
• credit card: Visa
• money order
• other

returns fueltanksysteme:

• time: 30 Days
• paid by: Buyer
• policy: Returns Accepted

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