Is Your 2002 Trailblazer or Envoy Running Rough?
If you’re dealing with frustrating issues like unpredictable stalling, erratic shifting, a persistent check engine light, or a complete no-start condition, a failing Powertrain Control Module (PCM) is often the culprit. As a technician with over two decades of experience under the hood, I’ve seen firsthand how a faulty PCM can turn a reliable SUV into a source of constant stress. The PCM is the brain of your vehicle’s engine and transmission, and when it starts to fail, it can create a cascade of confusing and costly problems.
Get a Reliable, Pre-Programmed Solution
This isn’t just a replacement part; it’s a complete solution. We take a quality PCM, part number 16255240, and program it specifically for your vehicle using your unique Vehicle Identification Number (VIN). This process ensures all communication pathways are correct and installs the latest, most stable software updates from GM. This critical step eliminates the need for an expensive trip to the dealership for programming, saving you time and money.
Common Symptoms of a Failing 2002 Trailblazer PCM:
- ✔ Unexplained engine stalling or cutting out while driving
- ✔ Harsh or delayed transmission shifting
- ✔ Check Engine Light (CEL) with communication-related trouble codes (U-codes)
- ✔ Reduced engine power or poor fuel economy
- ✔ The vehicle cranks but refuses to start
- ✔ False sensor readings or multiple unrelated error codes
A Real-World Diagnostic Story
“A customer’s 2002 Envoy XL came into my shop last month with a ‘Reduced Engine Power’ message and a code for the throttle position sensor. They had already replaced the throttle body twice with no success. After a quick check with my scan tool, I noticed the 5-volt reference signal to the sensor was dropping out intermittently. This is a classic sign of a failing driver inside the PCM. Instead of chasing phantom sensor issues, we installed a correctly programmed PCM, and the truck has been running perfectly ever since. It saved the customer from spending hundreds more on unnecessary parts.”
Plug-and-Play Installation: No Dealer Visit Required
We handle the complex programming so you can focus on the straightforward installation. Getting your Trailblazer, Envoy, or Bravada back to peak performance is easier than you think. Just follow these simple steps.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On these GMT360 platform vehicles, the PCM is located in the engine bay on the driver’s side, near the air filter housing.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old module. Inspect the pins for any corrosion or damage before proceeding.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New PCM: Mount your new, pre-programmed PCM and securely reconnect the wiring harnesses. Ensure they click into place.
- Reconnect the Battery: Reattach the negative battery terminal.
- Perform Security Relearn (If Necessary): In most cases, the vehicle will start right up. Some vehicles may require a simple security relearn procedure, which typically involves cycling the key and can be done in your driveway in about 10-15 minutes. Instructions are readily available online for your specific model.
Guaranteed Compatibility
This module is a direct replacement for several part numbers, ensuring a perfect fit and function for your vehicle. It is compatible with the following part numbers and models:
- Part Numbers: 19210066, 12571178, 12576463, 16255240, DLDA, YBLR, YBRY, YBZP
- Vehicle Fitment:
- 2002 Oldsmobile Bravada (with LH engine)
- 2002 Chevrolet Trailblazer (with LH engine)
- 2002 Chevrolet Trailblazer EXT (with LH engine)
- 2002 GMC Envoy (with LH engine)
- 2002 GMC Envoy XL (with LH engine)
IMPORTANT: After your purchase, please send us your vehicle’s 17-digit VIN. We cannot ship your order until we have this information to complete the essential programming service.