Restore Peak Performance to Your GM SUV
Is your 2002 Chevrolet Trailblazer, GMC Envoy, or Oldsmobile Bravada suffering from baffling engine issues? The Powertrain Control Module (PCM), often called the vehicle’s main computer, is the central command for all engine and transmission operations. When it begins to fail, it can cause a cascade of problems, from a simple Check Engine Light to a frustrating no-start condition. This replacement PCM, part number 16255240, is the definitive solution to get your truck back on the road, running smoothly and reliably.
This isn’t just a generic part off the shelf. We take your vehicle’s unique Vehicle Identification Number (VIN) and program the module with the latest, most stable software updates directly from GM. This ensures perfect compatibility and function, eliminating the need for an expensive trip to the dealership for programming. It arrives at your door ready for installation, making the repair process as simple and straightforward as possible.
From the Diagnostic Bay
We had a 2002 Envoy XL come in with a complaint of intermittent stalling at stoplights and a persistent P0300 (Random Misfire) code that no amount of new plugs or coils could fix. After hours of chasing wires, we hooked up a scope to the ignition coil control circuits directly at the PCM connectors. We found that the signal for cylinder 4 would drop out randomly when the module got warm. A failing ignition driver inside the original PCM was the culprit. Swapping in a VIN-programmed module like this one solved the problem instantly. The customer was thrilled to have their reliable family hauler back without the constant worry of stalling in traffic.
Common Symptoms of a Failing 2002 Trailblazer PCM
- ✔ Persistent Check Engine Light (CEL) with codes like P0601, P0602, P0606, or other communication errors.
- ✔ Engine stalling, stumbling, or running rough, especially after warming up.
- ✔ Unexplained misfires on one or more cylinders.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Complete no-start condition where the engine cranks but will not fire.
- ✔ Noticeable decrease in fuel economy.
- ✔ Failure to communicate with diagnostic scan tools.
Why Choose a VIN-Programmed Module?
The 4.2L Atlas inline-6 engine and 4L60-E transmission in your 2002 GM SUV rely on precise data to operate efficiently. A generic or non-programmed module simply will not work. Our process ensures this 2002 Trailblazer PCM is a true plug-and-play solution. By programming it to your VIN, we ensure it has the correct calibration for your engine, transmission, tire size, and emissions equipment. This critical step prevents compatibility issues and guarantees a seamless installation and immediate return to factory performance.
This module is a direct replacement for a range of part numbers, including: 19210066, 12571178, 12576463, 16255240, DLDA, YBLR, YBRY, and YBZP. It is compatible with the following vehicles:
- 2002 Bravada (Electronic Control Module; LH engine)
- 2002 Trailblazer & Trailblazer EXT (Electronic Control Module; LH engine)
- 2002 Envoy & Envoy XL (Electronic Control Module; LH engine)
After installation, you may need to perform a simple security relearn procedure, which can be done without any special tools. This syncs the new PCM with your vehicle’s anti-theft system. Once complete, your vehicle will start and run as it should, with performance and reliability restored.
Frequently Asked Questions
What exactly does the PCM do on my Trailblazer?
The Powertrain Control Module is the master computer for your engine and transmission. It reads data from dozens of sensors (like oxygen, crankshaft, and temperature sensors) and uses that information to control fuel injection, spark timing, and transmission shift points for optimal performance, fuel economy, and emissions.
Do I need to program this 2002 Trailblazer PCM?
No. We handle all the programming for you before shipment. Simply provide us with your vehicle’s 17-digit VIN during or after checkout, and we will load the correct GM-certified software for your specific vehicle. It will arrive ready to install.
Where is the PCM located on my 2002 Trailblazer?
On the 2002 Trailblazer, Envoy, and Bravada, the PCM is located in the engine bay on the driver’s side, near the firewall and brake master cylinder. It is a silver metal box with several large electrical connectors.
What is the security relearn procedure?
The security relearn, or Passlock relearn, syncs the new PCM to your vehicle’s anti-theft system. It’s a simple 30-minute process that involves turning the key to the ‘ON’ position for 10 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. No special tools are required.
Will this computer fit other part numbers?
Yes, this unit is a direct replacement for several part numbers, including 19210066, 12571178, 12576463, and service numbers DLDA, YBLR, YBRY, and YBZP. If your original module has one of these numbers, this part will be a perfect fit.