GMC TRUCK SIERRA150 Fuel Door Filler 177.GM9M12

( Brand: Gmc Truck ), ( Manufacturer Part Number: SIERRA150 ), ( Part Type: Fuel Door Filler ), ( Conditions Options: Mocha Steel Metallic, Sl ), ( Genuine Oem: Yes ), ( Ipn: 177.gm9m12 ), ( Manufacturer Warranty: 6 Month )

Review GMC TRUCK Fuel Filler Door fits 2012

The **GMC Sierra 1500 (2012) Fuel Filler Door Assembly (Part Number: 177.GM9M12)** is a critical yet often overlooked component that ensures both functionality and aesthetic cohesion in one of the most rugged and versatile full-size pickup trucks on the road. Designed to seamlessly integrate with the 2012 model year s bold, angular styling cues, this fuel filler door is crafted from high-quality, durable materials to withstand the harshest conditions from blistering desert heat to freezing mountain climates while maintaining structural integrity over thousands of miles. Engineered with precision, the door features a robust latch mechanism that guarantees a secure seal, preventing fuel vapors from escaping and ensuring compliance with emissions regulations. The exterior surface is treated with a durable, scratch-resistant coating that resists chipping, fading, and corrosion, preserving the truck s sleek, aggressive appearance even after years of exposure to road debris, salt, and UV rays. Inside, the door houses a reinforced fuel cap release lever, designed for effortless operation with a single, firm tug, while the integrated fuel filler neck is engineered to accommodate the truck s fuel system with a precise, leak-proof fit. Beyond its practicality, this component plays a key role in the truck s overall branding, as it bears the GMC logo and distinctive styling elements that reinforce the Sierra 1500 s reputation for rugged performance and premium craftsmanship. Whether installed on a high-performance Duramax diesel or a powerful V8 gasoline engine variant, this fuel filler door ensures that the truck s fueling process remains both efficient and visually cohesive, bridging form and function with GMC s signature blend of durability and design.

Buying a used **2012 GMC Sierra 1500 (177.GM9M12) with a fuel filler door issue** requires careful consideration of the vehicle s condition, repair costs, and long-term reliability. Below is a detailed breakdown of the pros and cons, followed by a conclusion and recommendation.

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### **Pros of Buying This Vehicle**

1. **Strong Base Model**

The 2012 GMC Sierra 1500 is a well-built, heavy-duty truck known for durability, especially with the **5.3L V8 (L83) or 6.2L V8 (L86)** engines, which are reliable if maintained properly. The 2012 model year is part of the **third-generation Sierra**, which improved upon earlier reliability issues.

2. **High Resale Value & Demand**

Full-size trucks, particularly GMCs, hold their value well due to their reputation for towing and hauling capability. A well-maintained 2012 Sierra can still be a solid purchase, especially if the fuel filler door issue is minor or easily fixable.

3. **Potential for Customization & Upgrades**

If you plan to modify the truck (e.g., suspension, exhaust, or interior upgrades), the 2012 model offers a good platform for DIY projects. Many aftermarket parts are available for this generation.

4. **Lower Purchase Price Compared to New**

Buying used saves thousands compared to a new truck, allowing you to allocate funds toward repairs, modifications, or other needs.

5. **Proven Durability in Right Hands**

With proper maintenance (oil changes, transmission service, brake upgrades), many 2012 Sierra 1500s last well beyond 200,000 miles. The fuel filler door issue may be isolated to the exterior or wiring, not necessarily indicative of broader mechanical problems.

6. **Available Parts & Mechanics Familiarity**

As a common model, parts are widely available, and mechanics are familiar with its systems, reducing diagnostic time for potential issues.

---

### **Cons of Buying This Vehicle**

1. **Fuel Filler Door Issue (Primary Concern)**

- **Electrical wiring issues** (loose or corroded connectors).

- **Mechanical failure** (broken hinges, faulty motor, or sensor problems).

- **Software glitches** (ECU or door actuator not responding).

- **Repair Costs:** Fixing this can range from **$100 $500 **, depending on whether it s a simple wiring fix, motor replacement, or ECU reprogramming. Some owners report DIY fixes with basic tools, while others need professional help.

- **Recurrence Risk:** If the underlying issue (e.g., corroded wiring or a faulty actuator) isn t addressed properly, the problem may return.

2. **Age-Related Wear & Tear**

- **Transmission:** The **6-speed automatic (6L80)** is generally reliable but may require fluid changes every **60,000 100,000 miles** to prevent failure. Some owners report rough shifting or delayed engagement.

- **Suspension & Bushings:** Front and rear bushings, control arms, and sway bar links may need replacement, costing **$500 $1,500** depending on severity.

- **Brakes:** Rotors and pads wear out over time, especially if the truck is used for towing. Rear brake jobs can be expensive (**$800 $1,500**).

- **Exhaust & Emissions:** Catalytic converters and oxygen sensors may fail, triggering check engine lights. Replacement costs can add up (**$300 $1,000**).

3. **Potential Electrical Gremlins**

- **Faulty window regulators** (common in some models).

- **Intermittent sensor failures** (mass airflow, throttle position).

- **Infotainment glitches** (if equipped with a radio/navigation system).

- These issues can be frustrating and may require professional diagnostics.

4. **Fuel Economy & Modern Standards**

- The **5.3L V8 gets 15 MPG highway**, which is poor compared to modern diesel or hybrid trucks. If fuel efficiency is a priority, this may not be the best choice.

- **Diesel alternatives** (e.g., 2014 models with Duramax) offer better MPG and torque, but come at a higher upfront cost.

5. **Rust Concerns (If in Snowy/Coastal Areas)**

- Older trucks in harsh climates may have **frame rust or undercarriage corrosion**, which weakens structural integrity. A thorough inspection is critical.

6. **Recall & Safety Modifications**

- Check if the truck has **unresolved recalls** (GM has had recalls for fuel filler door malfunctions, airbag issues, etc.). A **free recall check** via the NHTSA website ( safercar.gov (https://www.safercar.gov)) is essential.

- Some safety features (e.g., stability control, tire pressure monitoring) may require updates or replacements.

7. **Resale Value Decline**

- While still decent, the 2012 Sierra 1500 s resale value is lower than newer models. If you plan to sell later, you may not recover as much as with a more recent truck.

---

### **Key Questions to Ask Before Buying**

1. **Has the fuel filler door been repaired?** If yes, what was the issue and how was it fixed?

2. **Are there any active recalls?** (Check NHTSA and GM s website.)

3. **What s the maintenance history?** (Oil changes, transmission service, brake jobs, etc.)

4. **Has the truck been towed or used for heavy loads?** (Check for suspension wear.)

5. **Are there any check engine lights or warning lights?** (Scan for codes with an OBD-II reader.)

6. **Has the battery been replaced recently?** (Old batteries can cause electrical issues.)

7. **Are there any known rust hotspots?** (Inspect frame, wheel wells, and undercarriage.)

---

### **Conclusion**

- The truck is **low-mileage (under 100,000 miles) and well-maintained**.

- The fuel filler door problem is **minor (e.g., wiring issue) and not a recurring problem**.

- You re **willing to invest in repairs** (expect **$500 $1,500 ** for major issues).

- You **prioritize durability and towing capacity** over fuel efficiency or modern tech.

- The fuel filler door issue is **recurring or requires expensive parts**.

- The truck has **neglected maintenance** (e.g., no transmission service, worn suspension).

- You **can t afford unexpected repairs** (older trucks hide issues).

- You prefer **better fuel economy or modern safety features** (consider a newer diesel or hybrid).

---

### **Recommendation**

1. **Get a Pre-Purchase Inspection (PPI)**

- Hire a **trusted mechanic** to inspect the truck for **hidden issues** (transmission, suspension, electrical, rust). This costs **$100 $200** but can save thousands.

2. **Test Drive & Listen for Issues**

- Check for **unusual noises** (knocking from engine, grinding brakes, clunking suspension).

- Test the **fuel filler door** (open/close multiple times to see if it fails intermittently).

- Verify **all electronics** (windows, locks, lights, infotainment).

3. **Negotiate Based on Repairs Needed**

- If the fuel filler door repair is **$300 $500**, factor that into the purchase price.

- Avoid buying if the seller **won t disclose past repairs** or if the truck has **multiple unresolved issues**.

4. **Consider Alternatives**

- If you need **better fuel economy**, look at a **2014 Duramax diesel Sierra** (though they have their own quirks).

- If you want **lower maintenance**, consider a **used Ford F-150 (2015 ) or Ram 1500 (2019 )** with modern tech.

- If you re on a **tight budget**, a **2010 2011 Sierra** might be cheaper, but expect more wear.

5. **Budget for the Worst-Case Scenario**

- Allocate **$2,000 $5,000** for potential repairs in the first year (transmission, brakes, suspension, electrical).

- If the seller is **unwilling to negotiate** or **hides maintenance records**, walk away.

---

### **Final Verdict**

The **2012 GMC Sierra 1500 can be a solid buy** if you **find a well-documented, low

Details:

part #: sierra150 prices

• $80.70-$399.95

specifications fueltanksysteme:

• for makes: Gmc
• for years: 2012
• brand: Gmc Truck
• mpn: Sierra150
• part type: Fuel Door Filler
• conditions options: Mocha Steel Metallic, Sl
• genuine oem: Yes
• ipn: 177.gm9m12
• manufacturer warranty: 6 Month

general fueltanksysteme:

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

seller fueltanksysteme:

• city: Tyler, Texas
• # reviews: 2817
• rating: 98.9%

shipping fueltanksysteme:

• transit: 6-9 Days
• cost: $0.00
• type: Fixed
• carrier: USPS
• class: Expedited
• service: USPS Priority Mail

payments fueltanksysteme:

• other
• credit card: Mastercard
• wallet: Google-pay

offer fueltanksysteme:

• options: Ship-to-home
• availability: In Stock
• quantity: 1
• started: February 19, 2026
• sold: 0
• best offers: True

returns fueltanksysteme:

• paid by: Seller
• policy: Returns Accepted
• time: 60 Days

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