Restore Your Envoy’s Peak Performance and Reliability
Is your 2006 GMC Envoy XL running rough, shifting erratically, or showing a persistent Check Engine Light? These frustrating issues often point directly to a failing Powertrain Control Module. Don’t let unpredictable performance ruin your drive. This genuine replacement PCM, part number 12606373, is the definitive solution to bring back the smooth, dependable operation you expect from your vehicle. We take the guesswork out of the repair by pre-programming the module to your specific Vehicle Identification Number (VIN) before it ships. This ensures a seamless installation and immediate communication with all your vehicle’s systems, getting you back on the road with confidence and peace of mind.
Warning Signs and How to Overcome Them
A failing PCM can cause a cascade of confusing symptoms. If you’re experiencing any of the following, this module is the reliable fix you need:
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Diagnostic Trouble Codes (DTCs) related to sensors, emissions, or communication, such as P0601, P0606, or U-series codes.
- ✔ Rough or unstable idling and unexpected stalling.
- ✔ A noticeable decrease in fuel economy.
- ✔ Harsh or delayed transmission shifting.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
- ✔ Failure to pass state emissions testing.
A Mechanic’s Story: The Ghost in the Machine
I once had a 2006 Trailblazer (which shares this platform) come into the shop with the most baffling intermittent stalling issue. The owner had replaced half a dozen sensors chasing the problem. After hours of diagnostics, all signs pointed to the PCM. It was failing internally only when it warmed up. We installed a VIN-programmed module just like this one, and the vehicle ran perfectly. It’s a powerful reminder that the PCM is the brain of your engine, and when it falters, it can create problems that seem to come from nowhere. A correct replacement brings everything back into harmony.
Guided Installation for a Confident Repair
Replacing your 2006 Envoy XL PCM is a straightforward process that you can handle with basic tools. Our pre-programming service makes it a true plug-and-play repair.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the Module: On your Envoy XL, the PCM is typically found in the engine bay, on the driver’s side, attached to the inner fender or firewall.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old module. They have locking tabs, so be gentle to avoid damage.
- Remove the Old PCM: Unbolt the old module from its mounting bracket.
- Install the New PCM: Mount your new, pre-programmed module in the same location and securely reattach the wiring harness connectors. You’ll hear a click as they lock into place.
- Reconnect Battery: Reattach the negative battery terminal. The vehicle is now ready for the final step.
- Perform Security Relearn: You will need to perform a security relearn procedure (often called a CASE relearn) so the vehicle recognizes the new module. This can typically be done with a capable scan tool or by a qualified technician.
Tailored Fit for Your Ride
This module is a direct replacement for a wide range of GM trucks and SUVs, ensuring perfect compatibility. Please verify your vehicle is on this list:
- Buick Rainier: 2006 (4.2L)
- Chevrolet Colorado: 2004-2006
- Chevrolet Trailblazer & Trailblazer EXT: 2006 (4.2L)
- GMC Canyon: 2004-2006
- GMC Envoy & Envoy XL: 2006 (4.2L)
- Hummer H3: 2006
- Isuzu Ascender: 2006 (4.2L)
- Isuzu i-280: 2006
- Isuzu i-350: 2006
- Saab 9-7x: 2006 (6 cylinder)
This unit is a direct replacement for part 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
Do I need to do any programming myself?
No. We handle the programming for you. Simply provide your vehicle’s VIN when you order, and we will flash the module with the latest GM-certified software for your specific vehicle. It will arrive ready to install.
What is a VIN and where do I find it?
The VIN (Vehicle Identification Number) is a unique 17-digit code for your vehicle. You can find it on the driver’s side dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both engine and transmission functions. If the module is faulty, it can cause poor shifting, hesitation, or incorrect gear selection. Replacing a failing 2006 Envoy XL PCM often resolves these transmission-related symptoms.
Is a security relearn or CASE relearn required after installation?
Yes, after installing the new module, a security relearn procedure is necessary for the vehicle to start and run correctly. Additionally, a Crankshaft Variation Relearn (CASE relearn) is often required to prevent a P1336 trouble code. This can be performed by most professional scan tools or by any qualified repair shop.
What if my original part number isn’t listed?
The part numbers listed are the most common, but GM often has many superseded numbers. If your vehicle model and year match our fitment list, this module will be the correct one. The VIN programming ensures it works perfectly for your vehicle, regardless of the number on your old part.