2021 - 2023 Chevrolet Trailblazer Throttle Body Assembly (OEM)

What to Look For When Buying:

• Check for any visible damage like cracks or broken connectors.
• Ensure the throttle plate moves smoothly.
• Verify the part is the correct type for your vehicle's engine.
• Read reviews from other buyers.

Quality Indicators:

• OEM Markings: If buying a used or refurbished OEM part, look for original manufacturer markings.
• Warranty: A warranty indicates the seller stands behind the product.
• Material Quality: Check that the materials appear durable and well-made.
• Testing: Confirm that used or refurbished parts have been tested.

What's Typically Included:

• The throttle body assembly itself
• Sometimes a new gasket may be included
• Mounting hardware may or may not be included

Difficulty Level and Estimated Time:

• Difficulty: Intermediate
• Estimated Time: 1-2 hours

Special Tools Needed:

• Socket set
• Screwdrivers
• Throttle body cleaner
• OBD-II scanner (to clear codes)
• Torque wrench

Critical Steps and Tips:

1. Disconnect the negative battery cable.
2. Remove the air intake duct.
3. Disconnect the electrical connector from the throttle body.
4. Remove the throttle body mounting bolts.
5. Remove the old throttle body.
6. Clean the throttle body mounting surface.
7. Install the new throttle body with a new gasket.
8. Reconnect the electrical connector.
9. Reinstall the air intake duct.

DIY or Professional Installation:

• DIY is possible for mechanically inclined individuals. However, professional installation is recommended if you are not comfortable working on your car or if a throttle body relearn procedure is required.

Here's a comparison of the different types of throttle body assemblies available:

Used OEM: These throttle body assemblies offer the best value. They are genuine factory parts that have been tested and inspected to ensure they are in good working condition. You get original equipment quality at a significantly lower price.

Refurbished OEM: These are factory parts that have been professionally restored to like-new condition. They often include new components and offer a good balance of quality and price.

New Aftermarket: These are brand new throttle body assemblies manufactured by third-party companies. They are built to meet or exceed OE specifications.

• Air filter
• Mass airflow (MAF) sensor
• Intake manifold gasket
• Throttle position sensor (TPS)
• Idle air control (IAC) valve (if applicable)

Replacing these parts at the same time as the throttle body can prevent repeat failures. For example, a dirty air filter can cause carbon buildup in the throttle body. A faulty MAF sensor can cause the engine to run poorly, putting extra stress on the throttle body. Replacing the intake manifold gasket can prevent vacuum leaks that can affect throttle body performance.

• The typical lifespan of a throttle body assembly is 75,000 to 150,000 miles.

Factors Affecting Longevity:

• Driving habits
• Regular maintenance (air filter changes)
• Quality of fuel used
• Environmental conditions (dust, extreme temperatures)

• Used OEM: $50 - $150
• Refurbished OEM: $100 - $250
• New Aftermarket: $150 - $350

Labor costs for installation can range from $100 to $300, depending on the shop and the complexity of the job.

Total job cost estimates:

• Used OEM: $150 - $450
• Refurbished OEM: $200 - $550
• New Aftermarket: $250 - $650

Some 2020-2025 Buick Encore GX, Envista, Trailblazer, and Trax vehicles have experienced issues with excessive carbon buildup in the throttle body, leading to rough idling and stalling. Regular cleaning of the throttle body may be necessary to prevent these issues. Check for any Technical Service Bulletins (TSBs) related to the throttle body on your specific vehicle. Some owners have reported issues with the throttle position sensor failing prematurely on these models.

How to Confirm Proper Operation:

• Start the engine and let it idle.
• Check for smooth and stable idling.
• Accelerate the engine and check for smooth acceleration without hesitation.
• Use an OBD-II scanner to check for any new trouble codes.

What to Look/Listen For:

• No rough idling or stalling
• Smooth acceleration
• No unusual noises from the engine
• Check Engine Light is off

Q: How often should I clean my throttle body?
A: It is recommended to clean your throttle body every 30,000 to 50,000 miles, or more often if you notice symptoms like rough idling.

Q: Will a new throttle body improve my gas mileage?
A: If your old throttle body was dirty or malfunctioning, replacing it can improve your gas mileage by restoring proper engine performance.

Q: Do I need to perform a throttle body relearn after installing a new throttle body?
A: Some vehicles require a throttle body relearn procedure after installing a new throttle body. Consult your vehicle's service manual or a professional mechanic to determine if it is necessary.

Q: What happens if I don't clean my throttle body?
A: If you don't clean your throttle body, carbon buildup can cause rough idling, stalling, poor acceleration, and decreased fuel economy.

Q: Can I use any type of cleaner to clean my throttle body?
A: No, you should only use a throttle body cleaner specifically designed for cleaning throttle bodies. Other cleaners can damage the throttle body components.

OEM Part Numbers:

• ACDelco: 55510598

Fits Years: 2021 2022 2023