Buick LaCrosse 2005-2019 Engine Timing Chain Kit Replacement Guide
Understanding the common timing chain issues in the 3.6L V6 and 2.4L engines and how to choose the right replacement kit.
- The 3.6L V6 engine in 2009-2012 LaCrosse models is highly prone to premature timing chain stretch, identified by a startup rattle and codes like P0008.
- This is an advanced, non-DIY repair with 10-14+ hours of labor; professional installation is required to avoid engine damage.
- Always purchase a complete, high-quality aftermarket kit from a brand like Cloyes that includes all chains, sprockets, guides, and tensioners.
- To prolong the life of the new chain, use full synthetic oil and change it every 5,000 miles, regardless of what the oil life monitor says.
Is Your Buick LaCrosse Timing Chain Failing?
If you own a 2005-2019 Buick LaCrosse, especially one with the 3.6L V6 or 2.4L 4-cylinder engine, you may have heard about timing chain problems. This is a real and well-documented issue. The 3.6L V6 engines, particularly from around 2009-2012, were known for premature timing chain stretching. The 2.4L engines also had issues with their timing and balance shaft chains. This guide will help you understand the symptoms, the causes, and how to select a durable aftermarket replacement kit.
Known Issues: GM Special Coverage Programs
General Motors was aware of these problems and issued several Technical Service Bulletins (TSBs) and Special Coverage Programs. For the 3.6L V6, TSB 11340C extended warranty coverage for stretched chains to 10 years or 120,000 miles. For the 2.4L engine, program 12313C covered the balance shaft chain for the same duration. For most 2005-2019 vehicles, these programs have now expired due to age. This means the cost of repair will likely be your responsibility.
Symptoms of a Failing Timing Chain
Ignoring these signs can lead to catastrophic engine failure. If you notice any of these, get your vehicle inspected immediately.
- Rattling Noise on Startup: The most common symptom is a metallic rattling or clatter from the engine for a few seconds after a cold start. This happens because a stretched chain slaps against its plastic guides.
- Check Engine Light: A stretched chain will cause the camshaft and crankshaft timing to be out of sync, triggering a check engine light. Common codes include P0008, P0009, P0016, P0017, P0018, and P0019. 🎬 Watch: How to diagnose these codes using a labscope.
- Rough Idle or Misfires: As the timing becomes more erratic, the engine may run poorly, shake at idle, or misfire.
- Loss of Power: The vehicle may feel sluggish or hesitate during acceleration because the valves are not opening and closing at the optimal time.
Choosing the Right Aftermarket Timing Kit
When replacing your timing chain, you have a choice between OEM and aftermarket parts. Given that the original OEM chains were prone to stretching, a high-quality aftermarket kit is an excellent choice. The wide price range you see ($70 - $930) is due to the difference between single components and complete kits.
Pro Tip: Always buy a complete kit. The labor is the most expensive part of this job. A full kit should include all chains, tensioners, guides, sprockets, and sometimes even VVT actuators (phasers). Replacing everything at once prevents having to do the job again if another old component fails.
Aftermarket Brand Quality
Not all aftermarket brands are equal. For a critical part like this, it's best to stick with reputable names.
- Top Tier (Recommended): Brands like Cloyes have a strong reputation in the industry for making timing components that are often considered equal to or better than the original factory parts. They are a trusted name among professional mechanics.
- Mid-Grade: Brands like Dayco, Gates, and INA are also major manufacturers of automotive parts. They offer reliable kits that are a good alternative to OEM. INA is a major OEM supplier for many European brands and has a strong engineering background.
- Budget Kits: Be cautious with unbranded or unusually cheap full kits. The quality of the chain steel and plastic guides may not be up to par, leading to premature failure and repeating this very expensive repair.
Cost to Replace a Buick LaCrosse Timing Chain
This is not a cheap repair due to the high amount of labor required. The engine's front cover, and often much more, must be removed to access the chains. On many 3.6L V6 models, mechanics must drop the entire engine and subframe assembly to perform the service.
| Item | Estimated Cost |
|---|---|
| New OEM Kit | $750 - $950 (Parts Only) |
| New Aftermarket Kit | $70.23 - $929.80 (Varies by brand and completeness) |
| Shop Labor | $1,300 - $1,900+ |
| Total Estimated Cost | $1,600 - $2,700+ |
Frequently Asked Questions
Can I drive my LaCrosse with a bad timing chain?
It is strongly recommended not to. A stretched chain can jump a tooth, causing poor performance and engine damage. If the chain breaks completely, the valves will likely hit the pistons, resulting in catastrophic and often irreparable engine damage.
Is this a DIY job?
For 99% of home mechanics, no. This is an advanced, 10-14+ hour job that requires special tools like camshaft holding plates, harmonic balancer pullers, and an engine support bar. Mistakes can easily destroy the engine. This job is best left to an experienced professional technician.
🎬 See this full step-by-step timing chain replacement walkthrough.What causes the timing chain to fail?
The primary causes for the issues in the LaCrosse were a combination of factors: original chain designs that were not robust enough and going too long between oil changes. Dirty or low oil cannot provide proper lubrication and hydraulic pressure for the tensioners, accelerating wear. Using high-quality full synthetic oil and following a strict 5,000-mile change interval is the best way to protect your new timing chain.
Do I need to replace the VVT phasers and water pump too?
It is highly recommended. The VVT phasers (actuators) are a known wear item and require the same amount of labor to access. If you're already paying for the labor, replacing them with the new chains is smart preventative maintenance. On some GM engines, the water pump is also driven by the timing assembly, making it wise to replace it at the same time.
Helpful Videos
Technical Specifications
OEM Part Numbers: 12633451 12609258 12609262 12612839 12645465
Vehicle fitment varies significantly by engine (2.4L I4, 3.0L V6, 3.6L V6, 3.8L V6) and model year. The most problematic engine is the 3.6L V6 (LLT). Always verify the kit matches your specific engine before purchase. Kits should contain three chains (1 primary, 2 secondary), tensioners, guides, and sprockets for the V6 engine.
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.
- Buick LaCrosse:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Buick LaCrosse Timing Chain Failing?
- Known Issues: GM Special Coverage Programs
- Symptoms of a Failing Timing Chain
- Choosing the Right Aftermarket Timing Kit
- Aftermarket Brand Quality
- Cost to Replace a Buick LaCrosse Timing Chain
- Frequently Asked Questions
- 🎟️ Get 5% Off