Electronic Throttle Body for Chevy Trailblazer Colorado Impala

In this review the focus is on the Electronic Throttle Body compatible with a range of GM mid-2000s V6 and V8 engines, aimed at owners needing a direct-replacement throttle body. The bottom line: this part is best for DIY mechanics and independent shops that need an affordable, correctly sized unit that matches OE specifications and vehicle fitment lists. The reviewer found the product generally straightforward to install on specified Chevrolet, GMC, Buick, Hummer, Isuzu and related models and worth considering when rebuilding the intake throttle system.

Key Features

• Wide vehicle fitment: Covers multiple Chevrolet, GMC, Buick, Hummer, Isuzu and Pontiac models from the early to mid-2000s, reducing the risk of ordering the wrong unit.
• Electronic throttle design: Provides automated throttle control suited to vehicles with drive-by-wire systems so the engine management can adjust throttle position precisely.
• Bore diameter 3.03 in: Matches the specified opening size for the listed engines, helping maintain intended airflow characteristics.
• OE-style terminal layout: Eight male pin terminals replicate the original connector arrangement for straightforward electrical hookup on compatible vehicles.
• Aluminum housing: Durable construction resists corrosion and heat in the engine bay compared with some cheaper materials.
• Throttle position sensor included: Integrates the position sensing required for electronic throttle control, avoiding a separate sensor purchase.

Who It's For

This Electronic Throttle Body is aimed at owners of 2002-2007 Trailblazer, 2004-2007 Colorado/Canyon, 2002-2007 Envoy, Buick Rainier, Hummer H3, Isuzu Ascender and similar GM-platform vehicles who need a direct-replacement unit that follows OE dimensions and connector style. It is especially useful for a home mechanic comfortable with throttle relearn procedures and basic electrical connections.

Those who should look elsewhere include owners of vehicles outside the listed model years or engines, and buyers who prefer a throttle body with an included gasket or an idle air control motor, since this unit ships without a gasket and the idle air control motor is not included.

Pros & Cons

Pros

• Good vehicle coverage for many GM models, making it easy to find a match for listed engines.
• Solid aluminum housing and OE-style electrical pins for reliable mounting and connection.
• Includes the throttle position sensor, avoiding a separate component purchase.

Cons

• Some customers report mixed reliability, with occasional early failure; quality control appears variable.
• Gasket and idle air control motor are not included, so expect to supply those separately when needed.

Specifications

Bore Diameter	3.03 in
Terminal Quantity	8
Terminal Type	Pin (male)
Housing Material	Aluminum
Throttle Position Sensor	Included
Idle Air Control Motor	Not included
Reference Numbers	12568580, 25312095, TB1022

Our Verdict

This Electronic Throttle Body is a practical option for owners of the listed GM vehicles who need an affordable OE-dimension replacement and are prepared to handle installation and relearn procedures. It offers correct bore size, an aluminum housing and the required sensor, delivering good value when parts quality is consistent; however, buyers should be aware of some reports of early failure and plan to source a gasket separately.

Frequently Asked Questions

Will this throttle body fit my 2005 Trailblazer?
Yes, it is listed as compatible with Trailblazer 2002-2007 and Trailblazer EXT 2003-2006 with the appropriate 4.2L engines.

Does the unit include a gasket and idle motor?
No, the throttle body does not include a gasket and the idle air control motor is not included; acquire those parts separately if needed.

Is a relearn procedure required after installation?
Yes, throttle relearn procedures may be required so the engine control module recognizes the new unit and restores correct idle and throttle response.