Programmed 2002 Trailblazer EXT PCM | Replaces YBLR & More | VIN Matched

Restore Peak Performance to Your 2002 GM SUV

Is your 2002 Trailblazer, Envoy, or Bravada suffering from frustrating and unpredictable issues? A faulty Powertrain Control Module (PCM), the vehicle’s main computer, is often the culprit behind a host of problems that can leave you stranded. As a technician with over two decades of experience, I’ve seen firsthand how a failing PCM can mimic dozens of other component failures, leading to wasted time and money on incorrect repairs. This replacement 2002 Trailblazer EXT PCM is the definitive solution, arriving at your door fully programmed to your specific vehicle for a straightforward and effective repair.

Is Your SUV Exhibiting These Symptoms?

A failing engine computer can cause a wide range of issues. If you’re experiencing any of the following, a faulty PCM is a likely cause:

• ✔ Check Engine Light (CEL) is illuminated with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
• ✔ The engine cranks but refuses to start.
• ✔ Unexplained stalling, rough idling, or hesitation during acceleration.
• ✔ Harsh or erratic automatic transmission shifting.
• ✔ A noticeable decrease in fuel economy.
• ✔ Failure to pass an emissions inspection.
• ✔ Other warning lights (like ABS or security) turning on without a clear cause.

The Advantage of a Pre-Programmed Module

The biggest hurdle in replacing a modern vehicle’s computer is the programming. Typically, this requires a trip to the dealership and expensive specialty tools. We eliminate that entire process. When you order, you simply provide us with your vehicle’s 17-digit VIN. We then flash this 2002 Trailblazer EXT PCM with the latest, most stable software updates directly from GM. This ensures your engine and transmission operate exactly as the manufacturer intended, often correcting factory bugs you didn’t even know you had. It’s a true plug-and-play solution designed to get you back on the road with confidence.

A Straightforward Guide to Installation

Installing your new PCM is a manageable job for a DIYer with basic tools. Follow these steps carefully for a successful installation.

1. Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
2. Locate the PCM: On most 2002 GM SUVs like the Trailblazer, the PCM is located in the engine bay on the driver’s side, near the firewall or inner fender.
3. Disconnect the Old Module: Carefully unplug the electrical harness connectors from the old PCM. There are typically release tabs that need to be pressed or lifted. Avoid pulling on the wires themselves.
4. Remove the Old PCM: Unbolt the module from its mounting bracket. There are usually two or three bolts holding it in place.
5. Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and secure it with the original bolts.
6. Reconnect Everything: Plug the wiring harness connectors firmly into the new module until they click into place. Reconnect the negative battery terminal.
7. Perform Security Relearn: You will likely need to perform a simple security relearn procedure to sync the new PCM with your vehicle’s anti-theft system. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Instructions will be included.

Will This Fit My SUV?

This Electronic Control Module is guaranteed to be a direct-fit replacement for the following vehicles, provided they are the 2002 model year and equipped with the specified engine:

• ✔ 2002 Oldsmobile Bravada (LH engine)
• ✔ 2002 Chevrolet Trailblazer (LH engine)
• ✔ 2002 Chevrolet Trailblazer EXT (LH engine)
• ✔ 2002 GMC Envoy (LH engine)
• ✔ 2002 GMC Envoy XL (LH engine)

This module directly replaces the following part numbers: 19210066, 12571178, 12576463, 16255240, DLDA, YBLR, YBRY, and YBZP. Match any of these numbers to confirm compatibility.