Is Your GM Truck or SUV Running Rough? The PCM Might Be the Culprit.
The Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is the central computer of your vehicle. It’s the brain that manages everything from fuel injection and ignition timing to transmission shifting and emissions control. When it starts to fail, it can cause a cascade of confusing and frustrating problems that can be difficult to diagnose. If your 2003-2006 Chevrolet Tahoe, Silverado, Suburban, or other compatible GM vehicle is experiencing perplexing electrical or performance issues, a failing PCM is a likely cause.
Don’t let a faulty computer keep your reliable truck off the road. This is a direct-fit replacement PCM, service number 28042802, designed to restore your vehicle’s performance and reliability. The critical difference with our service is that we program the module specifically for your vehicle using your VIN before it ships. This ensures it arrives loaded with the latest GM software updates, ready for installation and proper communication with all other systems in your truck.
From the Diagnostic Bay
We had a 2005 Silverado 1500 in the shop that was driving the owner crazy. It would randomly stall at stoplights, but not always. Sometimes it would hesitate badly on acceleration. He had already replaced the throttle body and a few sensors with no luck. The check engine light was intermittent. After hours of checking wiring diagrams and testing circuits, we hooked up a scope to the PCM’s main processor. We found the voltage was dropping intermittently internally, causing it to reset. A new, properly programmed PCM like this one solved the problem instantly. It’s a reminder that these modules can fail in ways that don’t always throw a clear diagnostic code.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is on or flashes randomly, often with communication error codes (U-codes).
- ✔ Your vehicle won’t start or is very difficult to start (no-crank or crank-no-start).
- ✔ A noticeable decrease in fuel economy for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The engine stalls, stumbles, or misfires unexpectedly.
- ✔ Loss of power and poor overall engine performance.
- ✔ Inability for a scan tool to communicate with the PCM.
Your Go-To Solution for a 2003-2006 Tahoe PCM
Replacing the PCM on these GM trucks isn’t just about swapping hardware. The software is key. A module from a junkyard or a generic unprogrammed unit will not work, as it won’t have the correct software or security information for your specific vehicle. Our process eliminates the guesswork and the need for an expensive trip to the dealership for programming. We handle the complex part for you. By providing your VIN at checkout, you receive a module that is precisely calibrated for your truck’s engine, transmission, and options. This is the most reliable and efficient way to get your vehicle back to factory-spec operation.
Installation and Security Relearn
Physically installing the PCM is straightforward. It’s typically located in the engine bay on the driver’s side, near the battery or airbox. After disconnecting the battery, you simply unplug the electrical connectors and unbolt the old module to install the new one. However, after installation, you will need to perform a security relearn procedure. This allows the new PCM to synchronize with your vehicle’s anti-theft system. This procedure is simple and does not require special tools. It typically involves a 30-minute process of cycling the ignition key. We include instructions to guide you through this final step.
This module is a direct replacement for multiple service numbers, including 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. It fits a wide range of GM trucks and SUVs from 2003-2007. Please verify your vehicle in the fitment list to ensure compatibility.
Frequently Asked Questions
Why do you need my Vehicle Identification Number (VIN)?
Your VIN is essential because it allows us to program the PCM with the exact software and calibrations for your vehicle’s specific engine, transmission, and factory options. This ensures perfect compatibility and performance right out of the box.
Is this part difficult to install?
The physical installation is simple for anyone with basic mechanical skills. It involves disconnecting the battery, unplugging connectors, and swapping the module. The only additional step is a security relearn procedure, which we provide clear instructions for.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM or internal software error, this replacement module will solve the issue. It’s crucial to properly diagnose the vehicle first, as the light can be triggered by many other failing components.
What is a security relearn procedure?
It’s a process that syncs the new PCM with your vehicle’s anti-theft system. For most GM vehicles of this era, it involves turning the key to the ‘ON’ position for 10 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. This allows the systems to recognize each other.
Does this part fit models other than the Tahoe?
Yes, absolutely. This PCM is compatible with a wide array of GM trucks and SUVs, including the Silverado, Sierra, Suburban, Yukon, Escalade, Hummer H2, and more from roughly 2003 to 2007. Please check the detailed fitment list on this page to confirm for your specific model.