2021 - 2025 Chevrolet Trailblazer Throttle Body Assembly (OEM)

Buying a throttle body assembly? Here’s what to consider:

What to Look For:

• Compatibility: Make sure the part is designed for your specific year, make, and model.
• Condition: Assess the overall condition of the throttle body. Look for signs of damage, corrosion, or excessive wear.
• Functionality: If possible, test the throttle body before purchasing it. Check that the throttle plate moves smoothly and freely.

Quality Indicators:

What's Included:

Typically, the throttle body assembly includes:

• The throttle body housing
• The throttle plate
• The throttle position sensor (TPS)
• The throttle actuator motor (if applicable)
• Gaskets may or may not be included.

Replacing a throttle body assembly can range from a simple DIY job to one best left to a professional.

Difficulty Level: 2/5 (Easy to Moderate) Estimated Time: 30 minutes to 1 hour

Special Tools Needed:

• Socket set
• Screwdrivers
• Throttle body cleaner
• Scan tool (for clearing codes)

Critical Steps and Tips:

1. Disconnect the negative battery cable: This prevents electrical shorts during the installation.
2. Remove the air intake: Disconnect the air intake hose from the throttle body.
3. Disconnect electrical connectors: Unplug the connectors for the TPS and throttle actuator motor.
4. Remove the old throttle body: Unbolt the throttle body from the intake manifold.
5. Clean the mounting surface: Clean the intake manifold surface where the throttle body mounts.
6. Install the new throttle body: Install the new throttle body and tighten the bolts to the specified torque.
7. Reconnect electrical connectors: Plug in the connectors for the TPS and throttle actuator motor.
8. Reinstall the air intake: Reconnect the air intake hose to the throttle body.
9. Reconnect the negative battery cable:

DIY or Professional Installation?

• DIY: If you have basic mechanical skills and are comfortable working on your car, you can likely replace the throttle body yourself.
• Professional: If you're not comfortable working on your car, or if you're unsure about the installation procedure, it's best to have a professional install the throttle body.

Let's explore the different options for buying a throttle body assembly:

Compare Your Options:

When replacing your throttle body, consider these related parts:

• Mass Airflow (MAF) Sensor: A faulty MAF sensor can cause similar symptoms to a bad throttle body. Replacing it at the same time can prevent future problems.
• Air Filter: A dirty air filter restricts airflow and can cause the throttle body to work harder.
• Intake Manifold Gasket: If you remove the intake manifold to access the throttle body, replace the gasket to prevent vacuum leaks.

Replacing these parts together can save you time and money in the long run by preventing repeat failures.

A throttle body assembly typically lasts for:

• 100,000 to 150,000 miles or
• 7 to 10 years.

Factors Affecting Longevity:

• Driving conditions: Frequent stop-and-go driving can shorten the lifespan of the throttle body.
• Maintenance: Regular cleaning and maintenance can help extend the lifespan.
• Air filter condition: A clean air filter prevents dirt and debris from entering the throttle body.
• Fuel quality: Poor fuel quality can lead to carbon buildup in the throttle body.

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: $80 - $300

Labor Cost Considerations:

If you choose to have a professional install the throttle body, labor costs can range from:

• $100 - $200, depending on the shop's hourly rate and the complexity of the job.

Total Job Cost Estimates:

• DIY (Used OEM): $50 - $150 (parts only)
• DIY (New Aftermarket): $80 - $300 (parts only)
• Professional Installation (Used OEM): $150 - $350 (parts and labor)
• Professional Installation (New Aftermarket): $180 - $500 (parts and labor)

Some 2020-2025 Buick and Chevrolet models with the 1.2L and 1.3L engines have experienced issues with excessive carbon buildup in the throttle body. This can lead to rough idling, stalling, and poor performance. Regular cleaning of the throttle body is recommended to prevent these issues. Check for any Technical Service Bulletins (TSBs) related to the throttle body on your specific vehicle.

After installing the new throttle body assembly, it's important to verify that it's working correctly:

• Start the engine: The engine should start smoothly and idle properly.
• Check for smooth acceleration: The car should accelerate smoothly without hesitation.
• Listen for unusual noises: There should be no unusual noises coming from the throttle body area.
• Monitor the Check Engine Light: Make sure the Check Engine Light is off. If it's on, use a scan tool to check for trouble codes.
• Perform a throttle relearn procedure: This procedure helps the ECU learn the new throttle body's position. (Consult your vehicle's repair manual for the correct procedure).

What to Look/Listen For:

• Smooth, consistent idle speed.
• Responsive throttle when accelerating.
• No stalling or hesitation.
• No unusual noises from the engine bay.

FAQ

Q: How often should I clean my throttle body?
A: It's generally recommended to clean your throttle body every 30,000 miles or every two years, or more frequently if you notice symptoms like rough idling or stalling.

Q: Can a bad throttle body cause my car to fail an emissions test?
A: Yes, a malfunctioning throttle body can cause your car to fail an emissions test due to increased emissions.

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

Q: Do I need to reprogram the ECU after replacing the throttle body?
A: While not always necessary, performing a throttle relearn procedure is highly recommended to ensure the ECU properly adapts to the new throttle body. Consult your vehicle's repair manual for the correct procedure.

Q: What happens if I don't replace a faulty throttle body?
A: Ignoring a faulty throttle body can lead to worsening engine performance, potential damage to other engine components, and ultimately, a breakdown.

OEM Part Numbers:

• ACDelco: 25205292
• GM: 55510678, 55515823

Fits Years: 2021 2022 2023 2024 2025