Restore Peak Performance to Your GM Truck or SUV
Is your 2006 GMC Envoy, Trailblazer, or Hummer H3 acting up? Experiencing frustrating issues like stalling, erratic shifting, a no-start condition, or a persistent Check Engine Light? As a technician with over two decades of experience under the hood, I’ve seen these symptoms countless times. More often than not, the culprit is a failing Powertrain Control Module (PCM)—the electronic brain of your vehicle. This replacement PCM, part number 19209820, is the definitive solution to get your vehicle running reliably again.
We take the guesswork and dealership hassle out of the equation. Before this module ships, we program it specifically to your vehicle using the VIN you provide. This ensures it arrives loaded with the latest GM factory software updates, making it a true plug-and-play component. You’re not just buying a part; you’re getting a fully integrated solution designed to restore the precise fuel delivery, ignition timing, and transmission control your vehicle had when it was new. This is the most direct path to solving complex electronic issues and restoring your peace of mind.
From the Diagnostic Bay
I remember a 2006 Trailblazer 4.2L that came into my shop with a maddeningly intermittent problem. The owner complained of random stalling at stoplights and a check engine light that would come and go. We scanned it and found a P0606 (PCM Processor Fault) code stored. After verifying all power and ground circuits to the PCM were solid—a critical first step—we knew the internal processor was failing. The owner was worried about a multi-day repair and a huge bill from the dealer for a new computer and programming. We sourced this exact type of pre-programmed module. The swap took less than 30 minutes, and the Trailblazer ran perfectly. The customer saved hundreds and was back on the road the same day. That’s the value of a direct-fit, correctly prepared part.
Is Your Vehicle Showing These Symptoms?
A failing PCM can cause a wide range of problems. If you’re noticing any of the following, your engine computer is the likely cause. This is especially true if you have diagnostic trouble codes (DTCs) like P0601, P0602, or P0606.
- ✔ Unexplained Check Engine Light illumination
- ✔ Vehicle refuses to start or has difficulty starting
- ✔ Poor engine performance, hesitation, or misfires
- ✔ Decreased fuel economy
- ✔ Harsh or incorrect automatic transmission shifting
- ✔ Communication errors with your scan tool
A Straightforward Guide to Installation
Replacing the 2006 Envoy Powertrain Control Module is a job a confident DIYer can handle. The key is knowing its location, which varies by model.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait 10 minutes for capacitors to discharge.
- Locate the PCM: On SUV models like the Envoy, Trailblazer, Rainier, and Ascender, the PCM is typically mounted on the driver’s side of the engine block. On truck models like the Colorado, Canyon, and Hummer H3, it’s usually found on the passenger’s side firewall.
- Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harnesses and pull them straight out from the module. Avoid damaging the pins.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. There are usually two or three bolts holding it in place.
- Install the New Module: Seat your new, pre-programmed PCM into the bracket and secure it with the mounting bolts.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect your vehicle’s battery terminal.
- Final Steps: Your vehicle may require a security relearn procedure, which typically involves cycling the key. Consult your owner’s manual or a reliable online resource for the specific steps for your vehicle.
Verified Vehicle Compatibility
This module is a direct replacement for a wide range of original equipment part numbers and is guaranteed to fit the following vehicles:
- 2006 Buick Rainier (4.2L)
- 2004-2006 Chevrolet Colorado
- 2006 Chevrolet Trailblazer & Trailblazer EXT (4.2L)
- 2004-2006 GMC Canyon
- 2006 GMC Envoy & Envoy XL (4.2L)
- 2006 Hummer H3
- 2006 Isuzu Ascender (4.2L)
- 2006 Isuzu i-280
- 2006 Isuzu i-350
- 2006 Saab 9-7X (6-cylinder, ID 12569773 or 12597521)
This part also replaces service numbers: 12569773, 12588650, 12589311, 12589585, 12591647, 12591648, 12593531, 12593532, 12594430, 12594431, 12596783, 12596784, 12597521, 12597776, 12597777, 12600818, 12604438, 12604439, 12606369, 12606373, 12606374, 12606398, 12606399, 19209820, 19209821.
Frequently Asked Questions
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential for us to load the exact, correct GM software for your vehicle’s specific options and calibrations. This ensures perfect compatibility and function right out of the box, eliminating the need for expensive dealership programming.
Is this a plug-and-play part?
Yes, because we program it to your VIN, it is designed to be a plug-and-play installation. In some cases, a simple security relearn procedure (often called a ‘key-cycle relearn’) may be necessary, which you can typically do yourself in a few minutes.
Will this fix my Check Engine Light?
If the Check Engine Light is caused by an internal failure of the original PCM (common codes P0601-P0606), then this replacement module will solve the problem. It’s crucial to ensure the root cause of the issue is the PCM and not another sensor or wiring problem.
What if I have the wrong part number?
This module replaces a long list of original part numbers. As long as your vehicle is listed in our compatibility chart, this module will work, regardless of which of the listed part numbers was originally installed. The VIN programming is what makes it a perfect match.