2021 - 2025 Chevrolet Trailblazer Throttle Body Assembly (OEM)

Buying a throttle body assembly? Here's what to keep in mind:

• Compatibility: Make sure the part is designed for your specific year, make, and model.
• Condition: Decide if you want a used, refurbished, or new aftermarket part.
• Warranty: Check if the part comes with a warranty.
• Reputation: Buy from a trusted source.

Quality indicators:

• Cleanliness: A clean throttle body is a good sign.
• Smooth operation: The throttle plate should move freely.
• Proper sealing: There should be no air leaks.
• Electrical connections: The connectors should be in good condition.

What's included:

• The throttle body assembly itself.
• Sometimes a new gasket is included.

Replacing a throttle body assembly is usually a medium-difficulty job.

• Difficulty level: Medium
• Estimated time: 1-2 hours

Special tools needed:

• Socket set
• Screwdrivers
• Throttle body cleaner
• OBD2 scanner (to clear codes)

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?

• If you're comfortable working on cars and have the right tools, you can probably do it yourself. If not, it's best to have a professional install it.

Here's a look at your options when buying a throttle body assembly:

• Used OEM: These are genuine factory parts that have been tested and inspected. They offer great value because they're much cheaper than new parts.
• Refurbished OEM: These are factory parts that have been professionally restored with new components.
• New Aftermarket: These are brand new parts made by third-party manufacturers. They're built to meet or exceed OE specifications.

All three options can be good choices, depending on your budget and needs.

When replacing the throttle body assembly, consider these related parts:

• Throttle Position Sensor (TPS): This sensor tells the engine control unit (ECU) the position of the throttle plate. If it's old or worn, it's a good idea to replace it at the same time.
• Air Filter: A clean air filter helps prevent dirt and debris from entering the throttle body.
• Intake Manifold Gasket: If you remove the intake manifold to access the throttle body, replace the gasket to prevent leaks.

Replacing these parts can prevent repeat failures and ensure your engine runs smoothly.

A throttle body assembly typically lasts for 75,000 to 150,000 miles.

Factors that affect longevity:

• Driving conditions: Stop-and-go driving can shorten the lifespan.
• Maintenance: Regular cleaning can help extend the lifespan.
• Quality of parts: Higher-quality parts tend to last longer.

Here's a general idea of what you can expect to pay for a throttle body assembly:

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

Labor costs:

• If you choose to have a professional install the throttle body, expect to pay $100 - $300 in labor.

Total job cost estimates:

• DIY: $50 - $350 (depending on the part you choose)
• Professional installation: $150 - $650 (including parts and labor)

Some Buick and Chevy models with this engine have been known to experience throttle body issues related to carbon buildup. Regular cleaning can help prevent problems. There may be Technical Service Bulletins (TSBs) related to throttle body issues on these vehicles, so it's worth checking with your dealer or online resources.

After installing the new throttle body assembly, make sure everything is working correctly:

• Start the engine and let it idle. The idle should be smooth and stable.
• Check for any trouble codes with an OBD2 scanner.
• Drive the car and make sure it accelerates smoothly.
• Listen for any unusual noises from the engine.

If everything seems normal, you're good to go!

Q: How often should I clean my throttle body?
A: It's a good idea to clean your throttle body every 30,000 miles or so, or whenever you notice symptoms of a dirty throttle body.

Q: Can I use any kind of cleaner on my throttle body?
A: No, use a cleaner specifically designed for throttle bodies. Other cleaners can damage the throttle body.

Q: Will a new throttle body improve my gas mileage?
A: If your old throttle body was dirty or malfunctioning, a new one can definitely improve your gas mileage.

Q: Do I need to reset the ECU after installing a new throttle body?
A: It's a good idea to reset the ECU after installing a new throttle body. This allows the ECU to learn the new throttle body's characteristics. You can do this with an OBD2 scanner or by disconnecting the battery for a few minutes.

Q: What happens if I don't replace a bad throttle body?
A: If you don't replace a bad throttle body, your car may continue to run poorly, stall, or have other engine problems. It can also damage other engine components over time.

OEM Part Numbers:

• Chevrolet: 25192904, 25205292

Fits Years: 2021 2022 2023 2024 2025