BUICK 12678019 Left Cylinder Head 306-00272

( Brand: Buick ), ( Manufacturer Part Number: 12678019 ), ( Vintage Part: No ), ( Interchange: 306-272 ), ( Type: Cylinder Head Assembly ), ( Ipn: 306-00272 ), ( Manufacturer Warranty: 1 Month ), ( Id: 25c3e62e-2687-484f-97de-5f559da0b4d6 ), ( Country Of Origin: United States ), ( Performance Part: Yes )

Review BUICK Chevy Gmc Vin Left Cylinder Head Oem fits ENCLAVE TRAVERSE ACADIA 2012–2017

The **Buick 12678019 Cylinder Head (2012 2017 Enclave, 2017 Chevrolet Traverse, and 2017 GMC Acadia)** is a precision-engineered component designed to deliver optimal performance and reliability for the 3.6-liter V6 engine found in these popular midsize SUVs. Crafted from high-grade cast iron, this cylinder head features a robust, heat-resistant structure that ensures durability under the demanding conditions of daily driving, highway cruising, and towing. The head incorporates a **four-valve-per-cylinder design**, allowing for improved airflow, enhanced combustion efficiency, and a more responsive throttle response, which translates to smoother acceleration and better fuel economy. Each cylinder head is meticulously machined to tight tolerances, ensuring proper sealing with the intake and exhaust manifolds, as well as the engine block, to prevent leaks and maintain optimal compression.

This component is equipped with **hydraulic valve lifters**, which automatically adjust to eliminate valve lash, reducing wear on the camshaft and valves while minimizing noise and improving long-term reliability. The **intake and exhaust ports** are strategically contoured to optimize airflow dynamics, helping the engine achieve a balanced power-to-torque ratio that delivers both strength and efficiency. The cylinder head also houses the **spark plug wells**, which are designed to protect the plugs from heat and debris, ensuring consistent ignition and preventing misfires. Additionally, the head includes **integrated oil passages** that efficiently lubricate the camshaft and rocker arms, further extending the life of critical engine components.

For maintenance and repair purposes, this cylinder head is engineered for ease of access and serviceability. The **spark plug holes** are strategically positioned for quick and straightforward replacement, while the **valve cover** features a secure yet removable design, allowing for routine inspections and adjustments. The **exhaust ports** are optimized for compatibility with modern catalytic converters and emissions systems, ensuring compliance with stringent environmental regulations while maintaining peak engine performance. Whether used in a **Buick Enclave** for its refined luxury and spacious interior, a **Chevrolet Traverse** for its family-friendly versatility, or a **GMC Acadia** for its rugged adaptability, this cylinder head plays a crucial role in sustaining the engine s power output, fuel efficiency, and overall longevity.

Built to meet or exceed OEM specifications, this replacement cylinder head is an ideal solution for restoring or upgrading an engine that may have experienced wear, damage, or failure. Whether replacing a worn head due to overheating, coolant leaks, or general degradation, this part ensures a seamless fit and reliable operation, helping drivers maintain the performance and dependability they expect from these popular SUVs. With its combination of precision engineering, high-quality materials, and compatibility with aftermarket and OEM maintenance practices, this cylinder head is an essential component for anyone seeking to preserve or enhance the performance of their 3.6-liter V6-powered vehicle.

### **Analysis of Buying a Used Vehicle with a Known Cylinder Head Issue**

The vehicle in question a **2017 Buick Enclave, 2017 Chevrolet Traverse, or 2017 GMC Acadia** (all sharing the **2.0L turbocharged Ecotec engine, LFX code, with a reported left cylinder head issue (part number 12678019)** requires careful consideration before purchase. Below is a detailed breakdown of the pros and cons, followed by a conclusion and recommendation.

---

### **Pros of Considering This Vehicle**

1. **Shared Platform and Reliability (When Well-Maintained)**

- These vehicles share the same **2.0L turbocharged engine (LFX)**, which is generally reliable when properly serviced. Many owners report smooth operation if the turbo, oil system, and cooling are maintained.

- The **cylinder head issue (12678019)** is a known problem, but if the seller has already addressed it (or it s minor), the vehicle could still be a good buy.

2. **Fuel Efficiency and Performance**

- The turbocharged 2.0L engine provides **better fuel economy ( 20-22 MPG combined)** compared to older V6 models, making it cost-effective for daily driving.

- The **turbocharger adds power (190-200 HP)**, which is adequate for highway driving and light towing (up to 3,500 lbs with the proper package).

3. **Spacious and Comfortable Interior**

- These SUVs offer **three rows of seating**, making them practical for families or those needing extra space.

- The **interior quality is solid**, with decent materials and a smooth ride, though some have noted **plastic durability issues** over time.

4. **Resale Value and Availability of Parts**

- As mid-size SUVs, these models still hold **decent resale value**, and parts are widely available due to their popularity.

- The **cylinder head is a common replacement part**, meaning repairs are feasible if needed.

5. **Potential for Lower Purchase Price**

- Due to the **known cylinder head issue**, these vehicles may be priced lower than comparable models without engine concerns, offering a bargain for buyers who are willing to address the problem.

---

### **Cons and Risks**

1. **Known Cylinder Head Failure (12678019)**

- **Overheating** (common in turbocharged engines if cooling is neglected).

- **Improper maintenance** (low coolant, failed thermostat, or a bad water pump).

- **Manufacturer recalls** GM issued a **recall (NHTSA #17V-022)** for some 2017 models with this issue, but not all affected vehicles were fixed.

- **White smoke from the exhaust** (coolant burning).

- **Overheating** (even with a new thermostat).

- **Misfires or rough idle** (due to internal leaks).

- **Coolant loss** (visible under the engine bay).

- **Repair cost**: Replacing the cylinder head (or gasket) typically ranges **$1,200 $2,500**, depending on labor rates and whether additional components (like the turbo or water pump) need replacement.

2. **Turbocharger and Oil System Concerns**

- The **2.0L turbo engine is known for turbocharger failures** if oil changes are skipped or oil quality is poor.

- **Symptoms**: Whining noise from the turbo, blue smoke, or loss of power.

- **Repair cost**: Turbo replacement can cost **$1,500 $3,000 ** if labor is included.

3. **Transmission Issues (Especially in Older Models)**

- Some 2017 models have reported **rough shifting or delayed engagement** in the **6-speed automatic transmission**, particularly if fluid hasn t been changed.

- **Symptoms**: Jerky acceleration, grinding gears, or transmission slipping.

- **Repair cost**: Fluid change ( $300 $500) may fix minor issues, but a full transmission rebuild can exceed **$3,000**.

4. **Electrical and Infotainment Problems**

- The **infotainment system (if equipped with a touchscreen)** can be finicky, with reports of **freezing, slow response, or Bluetooth issues**.

- **Power window or door lock failures** are also common due to corrosion or wiring issues.

5. **Rust and Body Corrosion**

- These SUVs are prone to **underbody rust**, especially in snowy or salted regions. A thorough inspection of the **wheel wells, frame rails, and undercarriage** is essential.

6. **Recalled but Not Fixed Issues**

- Some 2017 models were part of a **recall for the cylinder head**, but not all owners completed the repair. Buyers should verify if the recall was addressed.

---

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

1. **Has the cylinder head (12678019) been replaced or repaired?**

- If not, **walk away** this is a major risk.

- If yes, ask for **proof of repair** (receipt, service records).

2. **Has the vehicle overheated recently?**

- Even if it hasn t, check for **coolant leaks, a bad thermostat, or a failing water pump**.

3. **Are there any turbocharger noises or performance issues?**

- A whining sound from the turbo is a **red flag**.

4. **When was the transmission fluid last changed?**

- If never or over **60,000 miles**, it should be replaced immediately.

5. **Has the vehicle been in an accident?**

- Frame damage can lead to **alignment and structural issues** over time.

6. **Are there any open recalls on the vehicle?**

- Check **GM s recall portal** or **NHTSA s VIN lookup** to confirm all recalls were addressed.

---

### **Conclusion**

Buying a **2017 Buick Enclave, Chevrolet Traverse, or GMC Acadia with a known left cylinder head issue (12678019)** is **risky but not impossible** if the following conditions are met:

- **The cylinder head has already been replaced** (with proper documentation).

- **The turbocharger and cooling system are in good condition** (no whining noises, proper oil changes, no overheating history).

- **The transmission fluid is fresh** (or recently changed).

- **The vehicle has been well-maintained** (service records available).

- **The purchase price accounts for potential future repairs** (budget at least **$2,000 $3,000** for unexpected issues).

**If the cylinder head has not been fixed**, the risk of **sudden engine failure, overheating, or costly repairs** makes this purchase **not worth the gamble**. The **2.0L turbo engine is reliable when properly maintained**, but the **cylinder head is a critical weak point** that cannot be ignored.

---

### **Final Recommendation**

- **Proceed with caution**, but **inspect thoroughly** (cooling system, turbo, transmission).

- **Get a pre-purchase inspection (PPI) from a trusted mechanic** ( $150 $200).

- **Negotiate the price downward** (10 20%) to account for the known issue.

- **Budget extra for maintenance** (expect at least **$1,000 $2,000** in the first year for potential issues).

- **Do not buy** unless the seller offers a **full warranty or significant discount** to cover the repair.

- **Consider a different model** (e.g., a **2018 model with the updated cylinder head design** or a **non-turbocharged V6** for lower risk).

- **2018 models** (GM improved the cylinder head design in later years).

- **2016 models with fewer miles** (if the cylinder head issue hasn t manifested yet).

- **A different brand** (e.g., **Toyota Highlander, Honda Pilot, or Ford Explorer**) with a **proven engine** and lower repair risks.

**Bottom Line:** This vehicle can be a **good buy if the cylinder head is fixed and the rest of the engine is healthy**, but the **risk is too high if the issue is unresolved**. Always **prioritize maintenance records and a thorough inspection** before committing.

Details:

Engines must be shipped to a commercial address with dock and forklift or the closest shipping terminal. Some external sensors or solenoids may need to be replaced. Transmission lines will need flushed, along with the transmission oil cooler needs replaced if equipped, this to be done so contaminants from bad not ruin your replacement. BUICK ENCLAVE 12-17 LH.

Picture in the listing may not be of actual item sold; it a stock picture only. Cylinder Head. GMC ACADIA 12-16 LH. Depending on the age of vehicle and other circumstances they will rust show signs corrosion.

CHEVROLET TRAVERSE 12-17 LH. In some cases the Transmission Control Computer module is internal and incorporated with valve body, which may require body to be replaced. Most items are shipped the same-day as purchase. Free shipping, if offered, applies only to commercial addresses with proper equipment dock and forklift unload.

Search for more parts BUICK ENCLAVE. Transmissions must be shipped to a commercial address with dock and forklift or the closest shipping terminal. Quick shipping. Buyer pays return shipping if wrong color ordered.

Warranty period begins the day after delivery. Buyer will need to replace the transmission oil filter, put a new pan gasket on, flush and add manufacturer specific fluids. Transfer cases will not be included with transmissions from 4x4 or All Wheel Drive vehicles. Axle seals, front and drive shaft seals will also need to be replaced.

part #: 12678019 prices

• $293.62-$343.00

specifications cylinderheapar:

• for models: Enclave, Traverse, Acadia
• for makes: Chevy, Gmc, Buick
• for years: 2012-2017
• brand: Buick
• mpn: 12678019
• vintage part: No
• interchange: 306-272
• type: Cylinder Head Assembly
• ipn: 306-00272
• manufacturer warranty: 1 Month
• id: 25c3e62e-2687-484f-97de-5f559da0b4d6
• country of origin: United States
• performance part: Yes

offer cylinderheapar:

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

general cylinderheapar:

• condition: Used
• Car Truck Parts Accessories > Engines Engine Parts > Cylinder Heads

seller cylinderheapar:

• # reviews: 24838
• city: Erie, Pennsylvania
• rating: 99.6%

returns cylinderheapar:

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

payments cylinderheapar:

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

shipping cylinderheapar:

• carrier: USPS
• type: Fixed
• transit: 3-7 Days
• class: Standard
• cost: $0.00
• service: USPS Ground Advantage

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