Restore Peak Performance to Your GM Truck or SUV
Is your Chevrolet Tahoe, Silverado, or GMC Sierra suffering from frustrating and hard-to-diagnose issues? An erratic idle, poor fuel economy, harsh shifting, or a persistent check engine light can often be traced back to a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM is responsible for managing everything from fuel injection and ignition timing to transmission shift points. When it begins to fail, it can cause a cascade of problems that can be difficult to pinpoint. This direct-fit Powertrain Control Module, service number 28042802, is the definitive solution to restore your vehicle’s reliability and drivability.
From the Diagnostic Bay
We had a 2005 Silverado 2500 come in that was a real head-scratcher. The owner had replaced the throttle body, MAF sensor, and all eight spark plugs chasing a rough idle and intermittent stalling issue. The codes were all over the place—random misfires, O2 sensor faults, communication errors. After hours of checking wiring and sensors, we hooked up a scope to the PCM outputs. We found the injector driver circuits were intermittently dropping out. A new, properly programmed PCM fixed every single issue. It’s a powerful reminder that when multiple, unrelated systems act up, the central computer is often the root cause.
Is Your Vehicle Exhibiting These Symptoms?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, it might be time to replace your engine’s computer. This replacement 2003-2006 Tahoe PCM is engineered to resolve these exact problems.
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Unexplained drops in fuel efficiency.
- ✔ Rough or unstable engine idle.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Hard, erratic, or delayed transmission shifting.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Failure to pass state emissions testing.
The Plug-and-Play Advantage: Programmed to Your VIN
Replacing a PCM isn’t just about swapping hardware. The module must be programmed with the correct software for your vehicle’s specific configuration, including engine size, transmission type, and emissions equipment. Our service eliminates the most difficult part of the job. When you order, simply provide us with your vehicle’s VIN. We will flash this module with the latest, most stable GM-certified software calibration for your exact vehicle. This ensures optimal performance, fuel economy, and emissions compliance right out of the box. You get a component that is ready for installation, saving you a costly trip to the dealership for programming.
Installation and Post-Installation Procedure
This module is a direct physical replacement for the original unit, typically located in the engine bay on the driver’s side, under or near the battery. While the physical swap is straightforward, please be aware that after installation, your vehicle will likely require a Crankshaft Position System Variation (CASE) relearn procedure. This synchronizes the new PCM with the engine’s crankshaft position sensor. Most professional-grade scan tools can perform this procedure in a few minutes. This is a critical step to ensure accurate ignition timing and prevent misfire codes.
Frequently Asked Questions
Do I need to get this PCM programmed by a dealer?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during or after checkout, and we will flash the module with the correct GM software for your specific truck or SUV.
What is a CASE relearn and is it required?
A CASE (Crankshaft Angle Sensor Error) relearn is a procedure that calibrates the PCM to the specific signal from your crankshaft position sensor. It is highly recommended after replacing the PCM on these GM vehicles to prevent a P0315 trouble code and ensure smooth engine operation. This can be done with most bi-directional scan tools.
Where is the PCM located on my 2004 Silverado?
On most GM trucks and SUVs from this era, including the Silverado, Tahoe, and Sierra, the PCM is located in the engine compartment on the driver’s side, often mounted to a bracket underneath the battery tray or next to the air filter box.
How do I provide my VIN number?
After you complete your purchase, you will receive instructions on how to send us your 17-digit VIN. We cannot ship your order until we receive this information, as the programming is specific to your vehicle.
Will this part fit other GM models besides the Tahoe?
Yes, absolutely. This PCM is compatible with a wide range of GM trucks and SUVs from 2003-2007, including the Avalanche, Escalade, Sierra, Yukon, Hummer H2, and more. Please review the detailed fitment list on this page to confirm compatibility with your exact model and year.