Chevrolet Trailblazer 2021-2024 Engine Camshaft Position Sensor Guide
Fixing rough idle, stalling, and check engine light issues on your Trailblazer starts here.
- This guide applies to the 2021-2024 Chevrolet Trailblazer, as this model was introduced to the North American market in 2021.
- Symptoms often include a check engine light (P0340, P0341, etc.), stalling, and rough idle.
- Before replacing, inspect the sensor's wiring connector for corrosion or damage, as this can mimic a failed part.
- Be aware of TSBs for related camshaft components that can cause similar symptoms and codes.
Is Your Trailblazer's Camshaft Position Sensor Failing?
A bad camshaft position sensor can cause a range of frustrating engine problems. Because the sensor is so important for engine timing, a faulty one can make your vehicle run poorly or even prevent it from starting. Recognizing the symptoms early can save you from a potential breakdown.
Key Failure Symptoms:
- Check Engine Light: This is the most common sign. A code scanner will likely show codes like P0340, P0341, P0365, or P0366.
- Engine Stalling: The engine may stall unexpectedly while driving or when coming to a stop.
- Rough Idle: Your Trailblazer may shake or vibrate more than usual when stopped.
- Hard Starting or No Start: The engine may take longer to crank before starting, or it may not start at all.
- Reduced Engine Power: You might notice the vehicle feels sluggish and doesn't accelerate as it should.
Known Issues: Check This First!
General Motors has issued Technical Service Bulletins (TSBs) for 2020-2021 Trailblazer and Encore GX models related to camshaft actuator bolts and oil control valves. These issues can cause a rough idle, reduced power, and trigger check engine light codes (like P0011 and P0014) that are very similar to a failing sensor. Before replacing the sensor, it's wise to be aware that the root cause could be a related component mentioned in these TSBs.
Choosing the Right Aftermarket Sensor
When replacing the camshaft position sensor on your Trailblazer, you have options outside of the dealership. Aftermarket parts offer a balance of quality and value. For this specific part, the price difference between aftermarket and OEM may be small, so it's worth comparing prices.
Brand Tiers:
- Standard Ignition (Standard Motor Products): Often considered a premium aftermarket brand, Standard produces parts that are engineered to meet or exceed OE specifications. They are a reliable choice for owners who want quality and durability.
- Walker Products: Walker is a well-regarded manufacturer that specializes in engine management sensors. They offer a dependable, cost-effective alternative to OEM parts, making them a solid choice for budget-conscious repairs without sacrificing quality.
Pro Tip: Check the Connector
Before you buy a new sensor, take a moment to inspect the old one's electrical connector. A loose or corroded connection can cause the same symptoms as a failed sensor. Unplug it, check for any green corrosion or bent pins, and ensure it clicks back into place securely. Sometimes, a simple cleaning with electrical contact cleaner is all that's needed.
Estimated Replacement Costs
The cost to replace a camshaft position sensor can vary depending on whether you do it yourself or have a shop perform the work.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Part | $21 - $56 |
| New OEM Part | $15 - $40 |
| Shop Labor | $60 - $120 |
| Total (Shop Repair) | $75 - $160 |
Frequently Asked Questions (FAQ)
How many camshaft position sensors does my Trailblazer have?
Your 2021-2024 Trailblazer's 3-cylinder engine has two camshaft position sensors: one for the intake camshaft and one for the exhaust camshaft. The diagnostic trouble code (e.g., P0340 vs. P0365) will usually tell you which one is having a problem.
Where are the camshaft position sensors located?
The sensors are located on the top of the engine, inserted into the valve cover or cylinder head area, near the camshafts. They are typically held in by a single 10mm bolt, making them relatively easy to access.
Can I replace this sensor myself?
Yes, this is a very DIY-friendly repair for most people with basic tools. The process generally involves disconnecting the battery, unplugging the electrical connector, removing one bolt, and carefully pulling the old sensor out. Always apply a small amount of clean engine oil or assembly lube to the new sensor's O-ring before installation to ensure it seats properly.
Should I buy an OEM or Aftermarket sensor?
For this part, high-quality aftermarket brands like Standard Ignition and Walker Products offer excellent value. However, OEM parts are surprisingly affordable for the Trailblazer. It is best to compare prices and choose a reputable brand over a no-name, generic part to avoid premature failure.
Helpful Videos
Technical Specifications
OEM Part Numbers: 12683500
The 1.2L and 1.3L engines use two sensors, one for the intake cam and one for the exhaust cam. They are typically 3-pin Hall effect sensors.
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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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