Buick LaCrosse (2005-2019) Engine Crankshaft Position Sensor: A Complete Guide
Experiencing stalling or starting problems with your LaCrosse? Your crankshaft position sensor might be the culprit.
- Do not drive if you suspect a bad crankshaft sensor; the risk of stalling is a major safety hazard.
- Replacement difficulty varies greatly by engine: the 3.8L V6 requires a pulley puller, while the 3.6L V6 sensor is in a very hard-to-reach location.
- For 2017 models with a 3.6L engine and a P0336 code, investigate TSB 17-NA-156 before replacing the part, as an ECM update may be the real solution.
- Choosing a quality brand like ACDelco, Delphi, or Bosch is recommended for this critical sensor to ensure reliability.
Is Your LaCrosse Stalling or Refusing to Start?
A failing crankshaft position sensor is a common reason for frustrating engine problems in the 2005-2019 Buick LaCrosse. When this sensor starts to go bad, it can leave you stranded without warning. The symptoms often start small but can quickly become serious. Recognizing the signs early can save you from a breakdown.
Top 5 Symptoms of a Bad Crankshaft Sensor
- Check Engine Light: A faulty sensor will almost always trigger the check engine light. The most common trouble code is P0335.
- Engine Won't Start: The engine may crank but refuse to start. This happens 🎬 Watch: Troubleshooting a Buick LaCrosse that cranks but won't start because the computer doesn't know when to send spark and fuel.
- Sudden Stalling: The engine may cut out unexpectedly while driving, especially when it's warm. This is a serious safety issue.
- Rough Idle and Misfires: You might feel the engine vibrating or stumbling when you're stopped at a light.
- Poor Acceleration: The car may feel sluggish or hesitate when you press the gas pedal because the ignition and fuel timing are off.
Engine & Year Differences Matter
Where the sensor is and how hard it is to replace depends entirely on which engine your LaCrosse has.
- 3.8L V6 (2005-2009): The sensor is located on the front of the engine, behind the main crankshaft pulley (harmonic balancer). Replacing it requires removing the passenger-side wheel and splash shield and using a special puller tool to remove the pulley. This is a moderately difficult job.
- 3.6L V6 (2010-2019): This is the most difficult replacement. The sensor is on the back of the engine near the transmission, in a very tight space. It is hidden behind a heat shield, and mechanics often need to work from both above and below the car. Some find it necessary to slightly lower the engine subframe for access. 🎬 See this walkthrough for replacing the sensor on a 3.6L engine
- 2.4L 4-Cylinder (2010-2016): The sensor is on the rear of the engine block, just above the oil filter. While still in a tight spot behind the starter, it is generally considered easier to access than on the 3.6L V6.
Known Issue: TSB for 2017 LaCrosse 3.6L V6
General Motors issued Technical Service Bulletin (TSB) 17-NA-156 for some 2017 LaCrosse models with the 3.6L engine. This TSB addresses an issue where the check engine light comes on with code P0336, but the sensor itself is not faulty. The problem is caused by electrical interference. The official fix is to have a GM dealer reprogram the Engine Control Module (ECM) with an updated calibration, not to replace the sensor. If you have a 2017 model with this code, check with a dealer before buying a new part.
Choosing the Right Aftermarket Sensor
When buying a new aftermarket sensor, quality matters. A cheap, poorly made sensor can fail quickly or provide inaccurate readings, causing the same problems you were trying to fix.
- OEM & Premium Brands (ACDelco, Delphi, Bosch): ACDelco is the original equipment supplier for GM, so their parts guarantee a perfect fit and performance. Delphi and Bosch are also major OEM suppliers known for high-quality electronics. These are your best bet for reliability and longevity.
- Quality Aftermarket (Standard Ignition, Dorman, NGK, Hitachi): Brands like Standard Ignition (SMP) and Dorman have a long history in the aftermarket. They offer a good balance of quality and price. NGK and Hitachi are well-respected OEM suppliers for many Japanese brands and also produce reliable sensors.
- Economy Brands (Store Brands, others): While the low price is tempting, economy sensors can be a gamble. They may work fine, but they might also have a shorter lifespan or less precise readings. If your budget is very tight, they are an option, but a premium brand is recommended for a critical part like this.
Cost of Replacing the Crankshaft Position Sensor
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Part | $20 - $131 |
| New OEM Part | $25 - $100 |
| Shop Labor | $150 - $450 |
Note: Labor costs vary significantly based on your engine type. The 3.6L V6 is on the high end of this range due to difficult access.
Frequently Asked Questions
Can I drive my LaCrosse with a bad crankshaft sensor?
No, it is not recommended. The engine can stall at any time, creating a dangerous situation in traffic. If the sensor fails completely, the car will not start, leaving you stranded.
What is the most common mistake when ordering this part?
The most common mistake is ordering the wrong sensor for your engine. The part for the 3.8L V6 is different from the one used in the 2.4L and 3.6L engines. Always verify the part number fits your specific year and engine before purchasing.
Do I need to perform a "relearn" procedure after replacement?
For most LaCrosse models, a specific relearn procedure with a scan tool is recommended after replacing the crankshaft position sensor to ensure the ECM has the most accurate data. Some sources note this is a required step. While the 🎬 Watch: How to perform a crankshaft sensor relearn procedure car may run without it, performance and fuel economy might be affected. After installation, it's also good practice to clear any stored trouble codes.
Is there a recall for the crankshaft position sensor on the Buick LaCrosse?
No, there are no active recalls specifically for the crankshaft position sensor on the 2005-2019 Buick LaCrosse. However, a Technical Service Bulletin (TSB) exists for some 2017 models with the 3.6L engine for a related trouble code.
Helpful Videos
Technical Specifications
OEM Part Numbers: 10456161 213-151 12615626 213-4573
A 3-pin Hall effect or magnetic sensor that reads the crankshaft reluctor wheel to determine engine speed and position.
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 LaCrosse Stalling or Refusing to Start?
- Top 5 Symptoms of a Bad Crankshaft Sensor
- Engine & Year Differences Matter
- Known Issue: TSB for 2017 LaCrosse 3.6L V6
- Choosing the Right Aftermarket Sensor
- Cost of Replacing the Crankshaft Position Sensor
- Frequently Asked Questions
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