Guide to the Engine VVT Solenoid for the 2005-2009 Buick LaCrosse
If your 3.6L V6 LaCrosse is running rough or has a check engine light, a faulty VVT solenoid could be the problem.
- This part is only for the 3.6L V6 engine, not the 3.8L V6 found in many 2005-2009 LaCrosse models.
- The most common cause of failure is dirty engine oil; regular oil changes are the best prevention.
- Symptoms include a check engine light, rough idle, and poor acceleration.
- Replacement is a simple DIY job for most, requiring basic tools and about 30 minutes.
Is This For My LaCrosse?
This guide is specifically for the 2005-2009 Buick LaCrosse equipped with the 3.6L V6 engine. The more common 3.8L V6 engine used in this generation does not have VVT solenoids. Check your vehicle's engine size before purchasing parts.
Symptoms of a Failing VVT Solenoid
A bad VVT solenoid can cause noticeable engine problems. The most common issue is a lit Check Engine Light on your dashboard. You might also experience a rough or shaky idle, where the car feels like it's vibrating when stopped. Other signs include poor acceleration, a general feeling of reduced engine power, and worse fuel economy than usual. 🎬 Watch: 5 symptoms of a bad VVT solenoid to look for. In some cases, you may hear a ticking or rattling noise from the engine.
The #1 Killer of VVT Solenoids
The leading cause of VVT solenoid failure is not age or mileage, but dirty or low engine oil. Sludge and contaminants in old oil clog the tiny filter screens on the solenoid, starving it of the oil pressure it needs to function. Sticking to your vehicle's recommended oil change schedule is the best way to prevent this part from failing prematurely.
🎬 See why dirty oil is the #1 killer of these parts.Choosing the Right Aftermarket Solenoid
When shopping for a replacement, you'll find several brands. Here’s how they generally stack up for your LaCrosse:
- Tier 1 (OEM Quality): Brands like ACDelco (the original GM parts supplier) and Standard Ignition (SMP) are known for their quality and reliability. They are engineered to the original factory specifications and are a trusted choice for durability.
- Tier 2 (Quality Aftermarket): Brands such as Dorman, Spectra, and Gates offer a more budget-friendly option. While Dorman is a popular aftermarket choice, some mechanics and DIYers report mixed results on electronic parts compared to OEM. However, for many drivers, these parts perform well and offer good value.
- Tier 3 (Value-Oriented): Other brands like Cloyes, Holstein, and various private labels provide the most affordable path to fixing the problem. These can be a good choice if the budget is the primary concern.
Pro Tip: Replace in Pairs?
Your LaCrosse's 3.6L engine has two VVT solenoids: one for the intake camshaft and one for the exhaust. They are identical parts. If one fails, the other has been operating under the same conditions (and with the same oil) for its entire life. To avoid doing the same job twice, it is often a good idea to replace both solenoids at the same time.
Installation Overview
Replacing the VVT solenoids on the 3.6L LaCrosse is a straightforward job that many DIYers can handle. The solenoids are located on the top front of the engine and are easy to access after removing the plastic engine cover. Each solenoid is held in by a single 10mm bolt. The basic steps involve disconnecting the battery, unplugging the electrical connector, removing the bolt, and carefully twisting and pulling the old solenoid out. Always lubricate the O-rings on the new solenoid with fresh engine oil before installation to ensure a good seal.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket VVT Solenoid | $33.95 - $82.52 |
| New OEM (ACDelco) VVT Solenoid | $55 - $90 |
| Shop Labor | $75 - $150 |
| Total Professional Replacement | $322 - $459 |
Frequently Asked Questions
Where are the VVT solenoids located?
On the 3.6L V6 engine, the two VVT solenoids are on the front (radiator side) of the engine, on top of the valve cover. They are positioned one above the other.
🎬 Watch: How to identify the solenoid locations and engine banks.Are there any recalls for this part?
No. While there are recalls for the 2005-2009 Buick LaCrosse, none are related to the VVT solenoids. The most prominent recall for this vehicle concerns the ignition switch.
Can I just clean my old VVT solenoid?
Some people have temporary success cleaning the solenoid's screens with brake cleaner. However, this is often a short-term fix. If the solenoid's internal electronic components are failing, or if the screens are too clogged, cleaning will not solve the problem and replacement is necessary.
What are the common trouble codes for a bad VVT solenoid?
The most common OBD-II codes are P0010, P0011, P0013, and P0014. These codes point to issues with the camshaft position timing on Bank 1 (the cylinder bank closer to the firewall on the 3.6L V6).
Do I need special tools for this job?
No special tools are required. A basic socket set with a 10mm socket and an extension will be sufficient for the job. A small magnet can be helpful for retrieving the bolt if it falls.
Helpful Videos
Technical Specifications
OEM Part Numbers: 12636175 12626012 12615613 12588943 12586722
Fits 2005-2008 Buick LaCrosse with 3.6L V6 (LY7) engine. Note: The 2009 model year did not offer the 3.6L engine. Two identical solenoids are used (Intake and Exhaust).
We Have This Part in Stock
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.
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