NISSAN 21421-6RZ0A Shutter

( Manufacturer Part Number: 21421-6RZ0A ), ( Genuine Oem: Yes ), ( Manufacturer Warranty: 1 Year ), ( Universal Fitment: Direct Replacement ), ( Parts Included: Only Part Reference 20 On The Diagram Is Included )

Review NISSAN Genuine Shutter Assembly

The **Nissan 21421-6RZ0A Shutter** is a high-performance, precision-engineered component designed specifically for Nissan s advanced automatic transmission systems, particularly those found in models equipped with the **CVT (Continuously Variable Transmission)** or **Xtronic** gearboxes. This shutter, often referred to as a **valve body solenoid shutter** or **transmission control valve assembly**, plays a critical role in regulating hydraulic flow within the transmission, ensuring seamless shifting, optimal torque conversion, and overall drivetrain efficiency. Crafted from durable **stamped steel** and precision-machined to exacting tolerances, this part is engineered to withstand the high pressures and temperatures inherent in modern transmission operations, preventing leaks, clogs, or premature wear that could compromise performance.

The **21421-6RZ0A** shutter is meticulously designed to fit a select range of Nissan vehicles, including popular models such as the **Altima, Sentra, Maxima, Rogue, and Murano**, particularly those produced between the late 2000s and early 2020s. Its unique shape and internal passages are calibrated to work in tandem with the transmission s solenoid pack, allowing for precise modulation of hydraulic pressure to the clutches, bands, and converters that enable smooth gear transitions. Over time, wear, debris buildup, or internal corrosion can degrade the shutter s sealing surfaces or restrict its movement, leading to symptoms such as delayed shifts, rough acceleration, or even complete transmission failure if left unaddressed. Replacing this component with an **OEM-quality or high-grade aftermarket alternative** restores the transmission s factory-intended functionality, extending its lifespan and maintaining the vehicle s intended performance.

Beyond its technical specifications, the **21421-6RZ0A shutter** exemplifies Nissan s commitment to reliability in its drivetrain systems. Unlike generic or poorly manufactured replacements, this part is built to meet or exceed the stringent quality standards of the original equipment manufacturer, ensuring compatibility with the vehicle s electronic control module (ECM) and transmission control unit (TCU). When installed by a trained professional, it integrates seamlessly with the transmission s fluid dynamics, helping to prevent costly repairs down the line. Whether addressing a failing transmission or performing routine maintenance, this shutter is an essential part for anyone seeking to preserve the longevity and efficiency of their Nissan s automatic transmission.

**Pros and Cons of buying a Nissan 21421-6RZ0A Shutter (Door Glass Regulator Motor)**

The **Nissan 21421-6RZ0A** is a door glass regulator motor used in various Nissan models, particularly in older vehicles like the Altima, Sentra, and Maxima (pre-2010). Below is a detailed breakdown of its advantages and disadvantages, followed by a conclusion and recommendation.

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### **Pros of buying a Nissan 21421-6RZ0A Shutter**

1. **Direct Fitment for Common Nissan Models**

- This part is designed specifically for older Nissan vehicles, ensuring compatibility without the need for extensive modifications. It fits models like the **2003 2009 Altima, 2003 2007 Sentra, and 2003 2006 Maxima**, among others. This makes it a reliable choice if you re restoring or repairing a known Nissan model.

2. **Reliability in Functionality**

- As an OEM (Original Equipment Manufacturer) or high-quality aftermarket part, it is built to meet Nissan s original specifications. This means it should operate smoothly, allowing the door glass to move up and down without excessive noise or resistance, which is a common issue with worn-out regulators.

3. **Prevents Further Damage**

- A failing door glass regulator can cause the window to stick, jam, or even fall out of the frame. Replacing it proactively can prevent more serious damage to the door panel, window track, or glass itself, saving money in the long run.

4. **Ease of Installation**

- The 21421-6RZ0A is relatively straightforward to install, especially for those with basic mechanical skills. It typically involves removing the door panel, disconnecting the old motor, and attaching the new one. Many online guides and videos provide step-by-step instructions, making the process accessible even for DIYers.

5. **Cost-Effective Compared to OEM Replacement**

- While not an OEM part in all cases, the aftermarket version is significantly cheaper than purchasing an original Nissan part. This makes it a budget-friendly solution for owners who want to avoid paying premium prices for genuine components.

6. **Improves Comfort and Convenience**

- A properly functioning door glass regulator ensures smooth operation of the power windows. This enhances the overall driving experience, especially in hot or cold weather when windows are frequently used.

7. **Widely Available**

- This part is stocked by many auto parts retailers (e.g., RockAuto, Amazon, eBay, and local auto shops), ensuring availability. It s also a common part in used or salvage yards, which can be a cost-effective option if sourced carefully.

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### **Cons of buying a Nissan 21421-6RZ0A Shutter**

1. **Age of the Part (Potential Wear in Aftermarket Versions)**

- Some aftermarket versions of this part may not be as durable as OEM parts, especially if they are older stock or lower-quality replicas. Over time, the motor may wear out again, requiring another replacement sooner than expected.

2. **Compatibility Issues with Modified or Aftermarket Doors**

- If the vehicle has been modified with aftermarket door panels or custom wiring, the 21421-6RZ0A may not fit perfectly or may require additional adjustments. This could complicate installation or lead to malfunctions.

3. **Potential for Counterfeit Parts**

- Buying from untrusted sellers (especially online marketplaces) increases the risk of receiving a counterfeit or low-quality part. Counterfeit parts may fail prematurely or not function at all, leading to frustration and additional costs.

4. **Limited Longevity in Harsh Conditions**

- Like all mechanical parts, the regulator motor s lifespan can be shortened by extreme temperatures, excessive use, or exposure to moisture (e.g., in coastal or rainy climates). If the vehicle is frequently exposed to harsh conditions, the part may not last as long as expected.

5. **Requires Basic Mechanical Skill**

- While installation is manageable for DIYers, those without mechanical experience may struggle with disassembling the door panel or reconnecting wiring. Improper installation could lead to further damage or failure of the part.

6. **Possible Noise or Stiffness Over Time**

- Even a new regulator may develop slight noise or stiffness as it ages, especially if the surrounding components (e.g., window tracks, seals) are worn. This could require additional maintenance down the line.

7. **Not a Permanent Fix for Underlying Issues**

- If the problem stems from something other than the regulator (e.g., a faulty window switch, wiring issues, or a damaged window track), replacing just the motor may not resolve the issue permanently. A thorough diagnosis is essential before purchasing.

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### **Conclusion**

The **Nissan 21421-6RZ0A door glass regulator motor** is a practical and cost-effective solution for owners of older Nissan models experiencing power window issues. Its direct fitment, reliability, and ease of installation make it a strong candidate for those looking to restore or maintain their vehicle. However, potential buyers should be cautious about part quality, installation challenges, and the risk of counterfeit products. Additionally, ensuring that the underlying cause of the problem (e.g., wiring, switches) is addressed will maximize the part s effectiveness.

For most DIYers or those working on a budget, this part is a **recommended choice**, provided it is sourced from a reputable seller and installed correctly. If the vehicle has been heavily modified or if the issue persists after replacement, further diagnostics may be necessary.

- **Buy it** if you re restoring a known Nissan model, have basic mechanical skills, and source the part from a trusted supplier (e.g., RockAuto, Amazon, or a local auto parts store with good reviews).

- **Consider alternatives** (e.g., OEM parts or professional installation) if you re unsure about compatibility, quality, or installation.

- **Pair the replacement with a check of related components** (window switches, wiring, tracks) to ensure long-term reliability.

Details:

Parts must be resalable and in the original packaging. Murfreesboro, TN 37129. Electrical parts are not returnable. Murfreesboro Nissan Parts.

Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer.

part #: 214216rz0a prices

• $186.25-$206.03

specifications ocoosys:

• for makes: Nissan
• mpn: 21421-6rz0a
• genuine oem: Yes
• manufacturer warranty: 1 Year
• universal fitment: Direct Replacement
• parts included: Only Part Reference 20 On The Diagram Is Included

returns ocoosys:

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

seller ocoosys:

• rating: 98.6%
• city: Murfreesboro, Tennessee
• # reviews: 204

payments ocoosys:

• credit card: Diners-club
• other
• wallet: Apple-pay

general ocoosys:

• condition: New
• Car Truck Parts Accessories > Engine Cooling Components > Other Engine Cooling Components

shipping ocoosys:

• type: Fixed
• class: Standard
• cost: $26.20
• transit: 4-9 Days
• service: Standard

offer ocoosys:

• started: March 1, 2026
• sold: 0
• options: Ship-to-home
• availability: In Stock
• quantity: 1

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