Is Your 2006 GMC Envoy Running Poorly? The PCM Might Be the Cause.
The Powertrain Control Module, or PCM, is the central command center for your 2006 GMC Envoy’s engine and transmission. It processes data from dozens of sensors to manage critical functions like fuel injection, ignition timing, and transmission shift points. When this vital component begins to fail, it can cause a wide range of frustrating and difficult-to-diagnose issues, from a simple check engine light to a vehicle that won’t start at all. If you’re tired of guessing games and want a reliable solution, you’ve come to the right place.
This is a direct replacement PCM for your vehicle, delivered to you pre-programmed with the latest official GM software updates. We use your vehicle’s unique Vehicle Identification Number (VIN) to ensure the module has the exact calibration for your Envoy’s specific configuration, making installation as straightforward as possible.
From the Diagnostic Bay
We had a 2006 Trailblazer (the Envoy’s sibling) come into the shop with a bizarre intermittent issue. It would randomly stall at stop lights and sometimes refuse to start for 10-15 minutes, with no consistent trouble codes. The owner had already replaced the crank sensor and fuel pump. After hours of chasing wires, we monitored the live data from the PCM and noticed the 5-volt reference signal would occasionally drop out, killing power to multiple sensors at once. A new, properly programmed PCM fixed the issue instantly. These intermittent electrical faults inside the module are common as they age and are nearly impossible to diagnose without seeing them happen live.
Common Symptoms of a Failing Powertrain Control Module
If your vehicle is experiencing any of the following issues, a faulty PCM could be the underlying problem:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Error codes related to module communication (e.g., U0100)
- ✔ Rough or erratic engine idling
- ✔ Unexplained stalling or cutting out while driving
- ✔ A noticeable decrease in fuel economy
- ✔ Harsh or incorrect transmission shifting
- ✔ Engine misfires or hesitation during acceleration
- ✔ The vehicle cranks but refuses to start
The Direct Solution: A Programmed 2006 Envoy PCM
Don’t settle for a generic, unprogrammed computer that will require an expensive trip to the dealership. This module is a comprehensive solution. By providing your VIN during checkout, you ensure that the 2006 Envoy PCM you receive is loaded with the correct software for your truck’s engine, transmission, and emissions equipment. This process corrects many factory bugs and improves overall vehicle operation and efficiency. It’s the most reliable way to restore your vehicle’s performance and eliminate those frustrating electrical gremlins.
Simple Installation and Wide Compatibility
This Powertrain Control Module is located in the engine bay on the driver’s side. Installation is a matter of disconnecting the battery, carefully unplugging the electrical connectors from the old unit, unbolting it, and installing the new one in its place. After reconnecting the battery, you will likely need to perform a simple security relearn procedure, which typically involves cycling the key in the ignition. This can be done in your driveway and does not require special tools.
This unit is a direct replacement for a wide range of GM trucks and SUVs, including the GMC Envoy, Chevrolet Trailblazer, Buick Rainier, Hummer H3, and more. It replaces numerous original part numbers, including: 12569773, 12588650, 12589311, 12589585, 12591647, 12591648, 12593531, 12593532, 12594430, 12594431, 12596783, 12596784, 12597521, 12597776, 12597777, 12600818, 12604438, 12604439, 12606369, 12606373, 12606374, 12606398, 12606399, 19209820, and 19209821. Restore your vehicle’s reliability and drive with confidence again.
Frequently Asked Questions
What is VIN programming?
VIN programming is the process of loading your vehicle’s specific software and calibrations onto the PCM. Every vehicle has a unique VIN, which tells us its engine, transmission, tire size, and other options. We use this information to ensure the computer works perfectly with your exact vehicle configuration right out of the box.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your 17-digit VIN. We cannot ship your part until we receive this information, as the programming is a critical part of your order.
Will I need to do anything after I install this PCM?
In most cases, you will need to perform a security relearn procedure, also known as a Passlock relearn. This procedure syncs the new PCM with your vehicle’s anti-theft system. It is a simple process that typically involves turning the key to the ‘ON’ position for 10 minutes, then off, and repeating two more times. Instructions can be easily found online for your specific model.
Is this a brand new part?
This is a high-quality, fully tested, and guaranteed functional part. Each module undergoes a rigorous inspection and programming process to ensure it meets or exceeds original equipment performance standards.
Where is the PCM located on my 2006 Envoy?
On the 2006 GMC Envoy with the 4.2L engine, the PCM is located in the engine compartment on the driver’s side, near the firewall and fuse box. It is a silver metal box with several large electrical harness connectors.