If you’re dealing with frustrating and unpredictable engine problems in your 2002 Oldsmobile Bravada, GMC Envoy, or Chevy Trailblazer, a failing Powertrain Control Module (PCM) is often the hidden culprit. As the brain of your vehicle’s engine, a faulty PCM can cause a cascade of issues that are difficult to diagnose, from a car that won’t start to poor fuel economy and a persistent Check Engine Light. This isn’t just an inconvenience; it’s a reliability issue that can leave you stranded.
This replacement PCM, part number 12576463, is the definitive solution. We take the guesswork and hassle out of the repair process. Before we ship it, we program the module with the latest official GM software updates, using the specific Vehicle Identification Number (VIN) from your truck. This means it arrives at your door ready for a straightforward installation, without requiring a trip to the dealership for expensive programming. Restore your vehicle’s performance and peace of mind with a reliable, correctly configured engine computer.
From the Diagnostic Bay
I remember a 2002 Trailblazer that came into my shop with a whole list of bizarre, intermittent complaints. The owner was frustrated because he’d already replaced the throttle body and a couple of sensors. The truck would randomly stall at idle, the transmission would sometimes shift hard, and the gauges would occasionally flicker. There were no consistent trouble codes, just a history of random communication errors. After checking all the main power and ground circuits to the PCM, we decided to swap in a known-good computer. Instantly, all the gremlins disappeared. The original 2002 Bravada PCM (same family) had internal circuit board failures that were causing data corruption across the network. It’s a classic example of how a single module can create multiple, seemingly unrelated symptoms.
Is Your SUV Showing These Symptoms?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, this module is likely the solution you need:
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (PCM Processor Fault).
- ✔ The engine cranks but refuses to start.
- ✔ Stalling, rough idling, or hesitation during acceleration.
- ✔ A noticeable drop in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication errors with diagnostic scan tools.
A Straightforward Guide to Installation
Replacing your 2002 Bravada PCM is a manageable job for a DIYer. While the module is pre-programmed, you will need to perform a security relearn procedure after installation so the vehicle recognizes the new component. This procedure is simple and requires no special tools.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to allow all capacitors to discharge.
- Locate the PCM: On these GM SUVs, the PCM is located in the engine bay, on the driver’s side, near the fuse box.
- Disconnect Connectors: Carefully release the locking tabs and unplug the wiring harness connectors from the old PCM. Inspect them for any corrosion or damage.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount the new PCM onto the bracket and securely plug in the wiring harness connectors.
- Reconnect Battery: Reconnect the negative battery terminal.
- Perform Security Relearn: Follow the included instructions for the GM Security Relearn Procedure (Passlock system). This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating this cycle three times before starting the engine.
Verified Vehicle Compatibility
This module is a direct replacement for several original equipment part numbers and is guaranteed to fit the following vehicles. Please provide your VIN upon purchase to ensure perfect programming.
- Compatible Part Numbers: 19210066, 12571178, 12576463, 16255240, DLDA, YBLR, YBRY, YBZP
- 2002 Oldsmobile Bravada (Electronic Control Module; LH engine)
- 2002 Chevrolet Trailblazer (Electronic Control Module; LH engine)
- 2002 Chevrolet Trailblazer EXT (Electronic Control Module; LH engine)
- 2002 GMC Envoy (Electronic Control Module; LH engine)
- 2002 GMC Envoy XL (Electronic Control Module; LH engine)
Frequently Asked Questions
2002 Bravada PCM
What information do you need from me?
After you complete your purchase, you must provide us with your 17-digit Vehicle Identification Number (VIN). We cannot program and ship your without it.