Is Your 2006 Envoy Giving You Headaches?
If your 2006 GMC Envoy is suddenly acting possessedโstalling randomly, shifting erratically, or the check engine light is on with a host of confusing codesโthe problem often points directly to the heart of the vehicle’s electronics: the Powertrain Control Module (PCM). As a technician with over two decades of experience, I’ve seen this exact scenario play out hundreds of times on the GMT360 platform (which includes your Envoy, the Trailblazer, Rainier, and others). The PCM is the brain, and when it starts to fail, the symptoms can be frustratingly inconsistent.
The Real Problem: Why These PCMs Fail
The PCM in your Envoy is located on the driver’s side of the engine bay. It’s constantly subjected to intense heat cycles and engine vibration. Over years of service, these factors can cause microscopic cracks in the solder joints on the circuit board or lead to the failure of internal electronic components. This isn’t a sign of a bad vehicle; it’s a reality of electronics aging under harsh conditions. The result? Intermittent communication breakdowns between the engine, transmission, and the rest of your vehicle’s systems.
Expert Pro Tip: Don’t Forget the Relearn Procedure!
After installing your new PCM, a Security Relearn (often called a Passlock or Passkey relearn) is almost always required. It’s a simple procedure you can do yourself in about 30 minutes with just the ignition keyโno special tools needed! This syncs the new PCM with your vehicle’s anti-theft system. Failing to do this will result in a crank-no-start condition. Many DIYers miss this step, but it’s critical for a successful installation on these GM models.
Common Symptoms of a Failing 2006 Envoy PCM:
If you’re noticing any of the following issues, a faulty PCM is the most likely culprit. I’ve personally diagnosed these symptoms and traced them back to the module time and time again in my shop.
- โ Check Engine Light is on with seemingly unrelated communication codes (U-codes) or specific processor faults.
- โ The engine cranks but refuses to start, or starts and immediately stalls.
- โ Harsh or delayed shifting from the automatic transmission.
- โ A noticeable drop in fuel economy for no apparent reason.
- โ The engine misfires, idles roughly, or hesitates during acceleration.
- โ Your scan tool cannot communicate with the PCM at all.
The Direct Solution: A VIN-Programmed PCM
This isn’t just a replacement part; it’s a complete solution. We take a genuine GM PCM and program it specifically for your 2006 Envoy using your vehicle’s unique 17-digit Vehicle Identification Number (VIN). This is the exact same process a dealership performs, but done for you before we ship it out.
What VIN Programming Means for You:
- โ No Dealer Visit Required: Save yourself the time, towing costs, and high labor rates of a dealership service appointment.
- โ Latest GM Software: We flash the module with the newest calibration updates from General Motors. These updates often correct factory bugs related to drivability, emissions, and transmission performance that your old module never received.
- โ Guaranteed Compatibility: By using your VIN, we ensure the PCM is loaded with the correct software for your Envoy’s specific engine, transmission, and emissions equipment.
- โ Plug-and-Play (Almost!): Once you receive the module and perform the quick Security Relearn procedure, you’re ready to go. It’s designed for a straightforward installation.
Guaranteed Compatibility
This Powertrain Control Module is a direct replacement for a wide range of GM vehicles. Please verify your part number or match your vehicle in the list below. This unit is compatible with the following part numbers and vehicles:
Replaces 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
Vehicle Fitment:
- โ Buick Rainier: 2006 (4.2L)
- โ Chevrolet Colorado: 2004-2006
- โ Chevrolet Trailblazer & Trailblazer EXT: 2006 (4.2L)
- โ GMC Canyon: 2004-2006
- โ GMC Envoy & Envoy XL: 2006 (4.2L)
- โ Hummer H3: 2006
- โ Isuzu Ascender: 2006 (4.2L)
- โ Isuzu I-280: 2006
- โ Isuzu I-350: 2006
- โ Saab 9-7X: 2006 (6-cylinder models)
IMPORTANT: After purchasing, please provide us with your VIN. We cannot ship your order until we have programmed the module. Get your Envoy back on the road with confidence. Order today!