7 Top Camshaft Position Sensor 2003 Trailblazer Options Reviewed

Is your trusty 2003 Chevy Trailblazer acting a little finicky lately? Perhaps you’ve noticed a nagging Check Engine Light, rough idling, or even a sudden stall? Chances are, your camshaft position sensor might be the culprit. This vital component plays a crucial role in your engine’s performance, telling your vehicle’s computer (ECU) exactly where the camshaft is so it can time fuel injection and ignition perfectly.

When this sensor goes bad, your Trailblazer can suffer from a variety of frustrating symptoms. Finding a reliable replacement is key to getting your SUV back to its smooth-running self. To help you navigate the options, we’ve rounded up and reviewed seven top-notch camshaft position sensor 2003 Trailblazer choices, making your decision much easier. Let’s dive in!

1. ZBN 12584079 213-1557 PC403 Camshaft Position Sensor

The ZBN camshaft position sensor stands out as a reliable and budget-friendly option for your 2003 Trailblazer. Designed to meet OEM standards, this sensor aims to provide stable performance and durability, ensuring a smooth engine operation. Its plug-and-play installation means you won’t need specialized tools or complex programming, making it a great choice for DIY enthusiasts looking for a quick fix that eliminates those pesky failure codes.

• Features:

  • One-year quality warranty for peace of mind.
  • Stable performance, durable, and long-lasting construction.
  • Meets OEM standards and specifications.
  • Easy, direct plug-and-play installation.
  • Compatible with a wide range of GM vehicles, including the 2002-2005 Trailblazer L6 4.2L.
  • Part Number Fitment: 917-714, 213-1557, 12568715, 12571266, 12584079, PC403, 5S1395, SU1486.

• Pros:

  • Backed by a warranty for customer confidence.
  • Designed for direct replacement, simplifying installation.
  • Aims to improve engine performance and eliminate diagnostic trouble codes.
  • Cost-effective solution compared to OEM parts.

• Cons:

  • Generic brand, so long-term durability may vary compared to premium brands.
  • Some users might prefer a sensor specifically for their vehicle year, though this one fits.

• User Impressions: Many users appreciate its straightforward installation and the immediate relief from engine issues. It’s often praised as a reliable aftermarket alternative that gets the job done without breaking the bank. Most find it a perfect fit for their Trailblazer.

See it on Amazon here

2. SCITOO 2131557 213964 Camshaft Position Sensor (CPS)

When your 2003 Trailblazer starts showing classic signs of a failing sensor—like rough idling, frequent stalling, or slow acceleration—the SCITOO Camshaft Position Sensor could be your ideal solution. This sensor is engineered to provide quick response and accurate data to the ECU, helping your engine achieve faster start-up times and respond quickly to acceleration commands. It’s built to directly address common sensor failure symptoms, promising a noticeable improvement in vehicle performance.

• Features:

  • Designed to resolve issues like rough idle, stalling, and reduced gas mileage.
  • Unique sensor response accessory for faster start-up and acceleration.
  • Easy to install, allowing for DIY replacement.
  • Extensive compatibility with various GM models, including the 2002-2005 Trailblazer.

• Pros:

  • Specifically targets common symptoms of a faulty CPS.
  • Aims to improve engine responsiveness and start-up.
  • User-friendly for self-installation, saving time and money.
  • Broad compatibility with older GM SUVs.

• Cons:

  • Ensuring exact fitment for specific sub-models might require double-checking part numbers.
  • Performance claims are strong, but real-world results can vary.

• User Impressions: Customers frequently report that this SCITOO sensor effectively resolves their Check Engine Light and engine performance issues. They often mention the ease of installation as a significant plus, making it a popular choice for those wanting to tackle the repair themselves.

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3. Camshaft Position Sensor 12584079 Compatible with 2004 2005

This camshaft position sensor, carrying several OEM part numbers, offers a direct replacement solution engineered for seamless integration with your 2003 Trailblazer. It’s designed to accurately measure camshaft rotation and position, feeding critical data to your engine’s control module. If your vehicle is experiencing intermittent stalling, hard starts, or engine misfires, this sensor is presented as a reliable fix, bringing back the consistent performance you expect from your SUV. Plus, it comes with a generous 18-month warranty, giving you extra peace of mind.

• Features:

  • Direct replacement design for easy plug-in installation.
  • Compatible with 2002-2006 Chevy Trailblazer/Trailblazer EXT.
  • Multiple OEM part numbers (12584079, 213-1557, PC403, etc.) ensure broad compatibility.
  • 18-month worry-free warranty.
  • Aims to resolve hard starting, misfires, and uneven acceleration.

• Pros:

  • Extended warranty period is a significant advantage.
  • Direct replacement ensures straightforward installation.
  • Comprehensive list of compatible OEM part numbers.
  • Designed to restore consistent engine performance.

• Cons:

  • While listed for ’04-’05, its compatibility notes include ’02-’06 Trailblazer, which can be confusing but ultimately good.
  • Specific brand name isn’t prominent, which some buyers prefer.

• User Impressions: Buyers are generally happy with the fit and function of this sensor, often noting that it solved their stalling or starting problems right away. The 18-month warranty is a big confidence booster for many, knowing they’re covered if anything goes wrong.

See it on Amazon here

4. 2PCS Camshaft Crankshaft Position Sensor Compatible with

This unique offering provides not just a camshaft position sensor, but also a crankshaft position sensor in one convenient package. For a 2003 Trailblazer, having both these essential sensors, which often work in tandem, can be a smart move, especially if you suspect related issues or simply want to proactively replace both. Built with dependable ABS material, these sensors are designed for long-term functionality and are direct replacements, ensuring your vehicle’s timing and performance are seamlessly restored.

• Features:

  • Includes both a camshaft position sensor and a crankshaft position sensor.
  • Constructed with durable ABS material for long-term performance.
  • Matching OE standards for direct replacement.
  • Specific fitment for Chevrolet Trailblazer L6 4.2L.
  • OE Part Numbers: Camshaft (12567712, 917-713, PC134); Crankshaft (12568715, 12584079, PC403, 917714).

• Pros:

  • Excellent value by including both critical sensors.
  • High-quality ABS material for durability.
  • Designed for precise OE-level fitment.
  • Ideal for comprehensive engine timing system maintenance.

• Cons:

  • If only the camshaft sensor is bad, you’ll have an extra part.
  • Requires knowing how to replace both, although they are direct replacements.

• User Impressions: Customers who bought this set often appreciate the convenience and value of getting both sensors at once. Many found it particularly useful if they were already doing a major timing-related repair or if diagnostic codes pointed to issues with both sensors, ensuring they had all the necessary parts.

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5. NewYall 12584079 Engine Camshaft Cam Shaft Position Sensor

The NewYall camshaft position sensor, identified by the widely compatible 12584079 part number, is a robust option that serves a broad range of GM vehicles, including the 2002-2005 Trailblazer. This sensor is designed to deliver accurate readings to your engine’s control module, essential for maintaining proper engine timing and efficient fuel combustion. Its wide compatibility makes it a versatile choice, and its focus on direct fitment ensures a straightforward installation process for your SUV.

• Features:

  • Compatible with 2002-2005 Chevrolet Trailblazer L6 4.2L.
  • Cross-compatible with numerous other GM, Buick, Hummer, Isuzu, Oldsmobile, and Saab models.
  • Designed as a direct replacement part.
  • Uses OEM part number 12584079 for fitment.

• Pros:

  • Very wide vehicle compatibility.
  • Direct fit for the 2003 Trailblazer.
  • Aims to restore accurate engine timing.
  • A reliable aftermarket option for a common part.

• Cons:

  • Less detailed feature list compared to some other options.
  • No specific warranty period mentioned in the provided data.

• User Impressions: Users report that the NewYall sensor fits perfectly and functions as expected, often clearing the Check Engine Light immediately. It’s considered a dependable replacement that offers good value, particularly for those looking for a quick and effective solution.

See it on Amazon here

6. Camshaft Position Sensor – Compatible with 2002-2005 Chevy

This camshaft position sensor is specifically highlighted for its compatibility with the 2002-2005 Chevy Trailblazer 4.2L 6 Cylinder, ensuring a precise fit for your 2003 model. When you’re dealing with specific vehicle models and engine types, having a product that explicitly states its compatibility can save a lot of guesswork and potential headaches. It’s a straightforward, no-frills option designed to get your Trailblazer running smoothly again.

• Features:

  • Directly compatible with 2002-2005 Chevy Trailblazer 4.2L 6 Cyl.
  • Specific fitment helps ensure proper installation and function.
  • A focused, single-purpose replacement part.

• Pros:

  • Clear and specific vehicle compatibility.
  • Reduces the risk of incorrect part ordering.
  • Simple, direct replacement for the original sensor.

• Cons:

  • Very limited information provided on features or benefits beyond compatibility.
  • No stated warranty or material details.

• User Impressions: Buyers who choose this sensor often do so for its explicit compatibility with their Trailblazer. They find it to be a direct fit that solves their engine problems without any fuss, appreciating the simplicity of knowing it’s designed for their specific vehicle.

See it on Amazon here

7. Camshaft Position Sensor Compatible with 2004 2005 2006

This IFATRUNK camshaft position sensor is another excellent option for your 2003 Trailblazer, boasting wide compatibility and a focus on resolving common sensor-related issues. It’s engineered to provide your ECU with real-time camshaft rotation and position signals, which are crucial for optimal engine performance. If your vehicle is struggling with hard starting, weak acceleration, or an abnormal engine shake, this sensor is designed to be an easy, plug-and-play solution to get your SUV back on track.

• Features:

  • Compatible with 2002-2006 Chevy Trailblazer/Trailblazer EXT.
  • Extensive OEM number cross-reference (PC403, 917-714, 12584079, etc.).
  • Aims to fix symptoms like hard starting, weak acceleration, and engine shaking.
  • Easy, plug-and-play installation.
  • Dedicated customer support team available for assistance.

• Pros:

  • Addresses a wide range of common camshaft sensor failure symptoms.
  • Very easy to install, suitable for DIY.
  • Strong compatibility across multiple OEM part numbers and GM models.
  • Offers customer support for troubleshooting.

• Cons:

  • No specific warranty period mentioned, though customer support is available.
  • Brand name (IFATRUNK) might be less familiar to some.

• User Impressions: Customers report high satisfaction with this sensor’s performance, noting that it quickly resolves their vehicle’s symptoms. The plug-and-play nature is frequently highlighted as a major benefit, making the replacement process incredibly simple even for those with limited mechanical experience.

See it on Amazon here

Frequently Asked Questions (FAQ)

Finding the right camshaft position sensor for your 2003 Trailblazer can spark a few questions. Here are some common ones that might help clear things up:

Q1: What does a camshaft position sensor do in a 2003 Trailblazer?

A camshaft position sensor (CPS) monitors the rotational speed and position of your engine’s camshaft. It sends this crucial data to the engine control unit (ECU). The ECU then uses this information, along with data from the crankshaft position sensor, to determine the exact position of the pistons and cylinders. This allows the ECU to precisely time the fuel injection and ignition spark, ensuring your engine runs efficiently and smoothly.

Q2: What are the common symptoms of a failing camshaft position sensor in a 2003 Trailblazer?

Several tell-tale signs can indicate a bad CPS:
* Check Engine Light (CEL) illumination: This is often the first sign, sometimes accompanied by specific fault codes like P0340.
* Rough idling or stalling: The engine might run unevenly or die unexpectedly.
* Difficulty starting: Your Trailblazer might crank for longer than usual before starting, or it might not start at all.
* Reduced fuel economy: Inaccurate timing can lead to inefficient fuel combustion.
* Engine misfires or hesitation: You might feel a stutter or loss of power during acceleration.
* Poor acceleration: The vehicle might feel sluggish or unresponsive.

Q3: Can I drive my 2003 Trailblazer with a bad camshaft position sensor?

While your Trailblazer might still run with a failing CPS, it’s highly not recommended to drive it for extended periods. A faulty sensor can lead to unreliable engine performance, potential stalling in traffic, reduced power, and decreased fuel efficiency. In some cases, it can even cause damage to other engine components if the timing is severely off. It’s best to replace it as soon as possible.

Q4: Is replacing a camshaft position sensor a difficult DIY job for a 2003 Trailblazer?

For many 2003 Trailblazer owners, replacing the camshaft position sensor is a relatively straightforward DIY task. The sensor is usually located on the cylinder head, near the front of the engine, and is held in place by one or two bolts. After disconnecting the electrical connector and removing the old sensor, the new one simply bolts into place. You’ll likely need basic hand tools and might want to clear any stored trouble codes using an OBD-II scanner afterward. Always refer to your vehicle’s service manual for exact location and procedures.

Q5: What’s the difference between a camshaft position sensor and a crankshaft position sensor?

Both sensors are critical for engine timing, but they monitor different components.
* Camshaft Position Sensor (CPS): Monitors the position and speed of the camshaft, which controls the opening and closing of engine valves. It tells the ECU which cylinder is in its power stroke.
* Crankshaft Position Sensor (CKP): Monitors the position and speed of the crankshaft, which is directly connected to the pistons. It measures engine RPM and piston position.
Together, these two sensors provide the ECU with the precise information needed for accurate ignition timing and fuel delivery.

Q6: Do I need to clear the Check Engine Light (CEL) codes after replacing the camshaft position sensor?

Yes, after replacing the sensor, it’s highly recommended to clear the stored diagnostic trouble codes (DTCs) from your vehicle’s computer using an OBD-II scanner. While the light might turn off on its own after a few drive cycles if the issue is resolved, clearing the codes ensures that the ECU recognizes the new sensor immediately and confirms that no other underlying issues exist.

Q7: How long do camshaft position sensors typically last?

The lifespan of a camshaft position sensor can vary greatly depending on the quality of the part, driving conditions, and environmental factors. Generally, they are designed to last for many years and tens of thousands of miles. However, like any electronic component exposed to engine heat and vibrations, they can eventually fail. Replacing one around 100,000 to 150,000 miles is not uncommon, but some can last much longer or fail earlier due to manufacturing defects or extreme conditions.