Buick Enclave Engine Crankshaft Position Sensor Guide (2008-2018)
Everything you need to know before replacing the crankshaft position sensor on your 2008-2018 Buick Enclave.
- A failing crankshaft sensor can cause a no-start condition or dangerous stalling while driving.
- Due to the difficult replacement, always use a high-quality OEM or premium aftermarket brand like ACDelco, Delphi, or Bosch.
- A 'Crankshaft Variation Relearn' procedure with a professional scan tool is mandatory after replacement.
- Be aware of TSB PIP3423; timing-related codes could indicate a much more serious issue with the crankshaft reluctor wheel.
Is Your Buick Enclave Stalling or Not Starting?
A failing crankshaft position sensor is a common reason for a 2008-2018 Buick Enclave to develop serious running problems. Symptoms often start with a Check Engine Light but can quickly lead to your vehicle leaving you stranded. Understanding the signs of failure and how to choose the right replacement part is crucial.
Symptoms of a Failing Crankshaft Sensor
- Check Engine Light: This is often the first warning. The most common trouble codes are P0335 (Crankshaft Position Sensor 'A' Circuit Malfunction) and P0336 (Crankshaft Position Sensor 'A' Circuit Range/Performance).
- Engine Cranks but Won't Start: The engine turns over, but it won't fire up because the ECM doesn't have the crankshaft position data it needs to time spark and fuel.
- Sudden Stalling: The engine may die unexpectedly while you are driving, including at highway speeds or when coming to a stop. This is a critical safety issue.
- Rough Idle and Misfires: Your Enclave may idle poorly, shake, or feel like it's stumbling. This happens when the sensor sends erratic signals, confusing the engine's timing.
- Poor Acceleration: You might notice the vehicle feels sluggish or lacks power because the ignition and fuel timing are not optimized.
- Reduced Fuel Economy: Inefficient engine timing caused by a bad sensor can lead to your Enclave using more fuel than normal. 🎬 Watch: Common symptoms of a bad crankshaft position sensor
Warning: Potential for Serious Misdiagnosis
A GM Technical Service Bulletin (TSB PIP3423) applies to the 3.6L V6 engine in your Enclave. It warns that trouble codes often associated with timing chains (like P0008, P0009, P0016-P0019) can sometimes be caused by a slipped crankshaft reluctor wheel—the part the sensor reads. While the sensor itself is a simple part, a slipped reluctor wheel requires a major engine repair (crankshaft replacement). If you have these codes, it's important to rule out this serious mechanical issue before simply replacing sensors.
Choosing the Right Aftermarket Crankshaft Sensor
The crankshaft sensor is not a part where you want to cut corners. The labor to access it is significant, so a cheap, unreliable part could mean doing the job all over again. For a critical sensor like this, brand quality matters.
Brand Quality Tiers
- Tier 1: OEM & Premium Brands (Recommended)
These brands are either the original equipment manufacturer for GM or have a long-standing reputation for quality sensors. They offer the best reliability and are worth the extra cost to avoid a repeat failure. Sticking to this tier is highly recommended. Brands include: ACDelco (GM Original), Delphi, Bosch, Hitachi, and NGK/NTK. - Tier 2: Quality Aftermarket
These brands are well-known in the aftermarket and can be a reliable alternative to OEM. They are generally a safe choice if a Tier 1 brand is not available. Brands include: Standard Ignition (SMP) and Beck Arnley. - Tier 3: Economy Brands
While the low price is tempting, these brands can be a gamble in terms of quality and longevity. Given the difficulty of replacement on the Enclave, using an economy sensor is not advised. A failure could leave you stranded and require you to pay for labor a second time. Brands in this category include Dorman, Walker Products, Holstein, and other house brands.
Pro Tip: Crankshaft Variation Relearn is NOT Optional
After replacing the crankshaft position sensor on any 2008-2018 Buick Enclave, a Crankshaft Position System Variation Learn Procedure (also called a CASE relearn) MUST be performed with a compatible professional scan tool. This procedure teaches the ECM the unique signal from the new sensor to ensure accurate misfire detection. If you skip this step, the vehicle may set a P1336 trouble code, run poorly, or have a persistent Check Engine Light. Most DIY scan tools cannot perform this function. Plan to have a repair shop complete this procedure after you install the part.
🎬 Watch: How to perform a crankshaft variation relearn procedureEstimated Replacement Costs
The cost to replace the crankshaft position sensor can vary based on your location and the parts you choose. The labor is a significant part of the total cost due to the sensor's difficult-to-reach location.
| Part/Service | Estimated Cost |
|---|---|
| New OEM Sensor (ACDelco) | $40 - $60 |
| New Aftermarket Sensor | $22 - $156 |
| Shop Labor | $117 - $172 |
| Total Estimated Cost (Shop Repair) | $154 - $220 |
Frequently Asked Questions (FAQ)
Where is the crankshaft position sensor on a 2008-2018 Buick Enclave?
The crankshaft position sensor is located on the rear of the engine block, near where the engine bolts to the transmission. It is positioned behind a metal heat shield, making it difficult to see and access from underneath the vehicle.
🎬 See this walkthrough for replacing the sensor on a GM 3.6LCan I drive my Enclave with a bad crankshaft sensor?
No, it is not recommended. A failing sensor can cause the engine to stall suddenly and without warning, which is a serious safety risk on the road. If the engine won't start, you won't be able to drive it at all.
What is a crankshaft variation relearn?
It is a calibration procedure performed with a scan tool after replacing the sensor. It allows the engine computer to learn the precise signal of the new sensor to accurately detect misfires. It is a required step on all GM 3.6L engines.
Should I replace the camshaft position sensors at the same time?
It is not required. The crankshaft and camshaft sensors work together but do not necessarily fail at the same time. Replace only the part that has been diagnosed as faulty. However, if your vehicle has high mileage, replacing the two camshaft sensors (which are much easier to access on top of the engine) can be considered preventative maintenance.
Helpful Videos
Technical Specifications
OEM Part Numbers: 12590901 12615626 213-354
3-pin connector, Hall Effect sensor.
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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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