Programmed 2003-2007 Silverado 1500 PCM Engine Computer | 28042802

Restore Your Truck’s Performance and Reliability

Is your 2003-2007 Silverado 1500 acting up? Dealing with a persistent Check Engine Light, unpredictable stalling, or rough transmission shifts can be incredibly frustrating. As a technician with over 20 years of experience under the hood, I’ve seen firsthand how a failing Powertrain Control Module (PCM) can create a cascade of baffling electronic problems. This isn’t just a component; it’s the brain of your engine and transmission. When it falters, your truck’s performance, fuel economy, and dependability suffer. This replacement PCM is the definitive solution, arriving pre-programmed with the latest GM software matched directly to your vehicle’s VIN. It’s designed to restore your truck to its original factory specifications and get you back on the road with confidence.

Is Your Truck Exhibiting These Classic PCM Failure Signs?

A faulty PCM can manifest in numerous ways, often mimicking other sensor failures. Before you start replacing parts unnecessarily, check if your vehicle is showing these common symptoms. A correct diagnosis saves time and money. This 2003-2007 Silverado 1500 PCM is the direct fix for these issues.

• ✔ Unexplained Check Engine Light with codes like P0601 (Internal Control Module Memory Check Sum Error), P0606 (PCM Processor Fault), or U-series communication codes.
• ✔ The engine cranks but refuses to start.
• ✔ Sudden stalling or a rough, inconsistent idle.
• ✔ Noticeable decrease in fuel mileage.
• ✔ Harsh, erratic, or delayed automatic transmission shifting.
• ✔ Failure to pass state emissions testing.
• ✔ Apparent loss of engine power and throttle response.

A Straightforward Guide to Installation

Installing your new 2003-2007 Silverado 1500 PCM is a manageable job for a DIYer with basic hand tools. Since we program it for you, there’s no need for an expensive trip to the dealership. Just follow these steps carefully.

1. Safety First: Always disconnect the negative terminal from your truck’s battery and wait at least 15 minutes for the system capacitors to discharge.
2. Locate the PCM: On most of these GM trucks and SUVs, the PCM is located in the engine bay on the driver’s side, often under or next to the battery tray in a black plastic housing.
3. Disconnect the Harnesses: Carefully lift the locking tabs and unplug the wiring harness connectors from the old PCM. Never force them; they are designed to come off smoothly once unlocked.
4. Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s typically held in by a few 10mm bolts.
5. Install the New PCM: Mount your new, pre-programmed PCM and securely fasten the bolts.
6. Reconnect Everything: Plug the wiring harnesses back into the new module, ensuring the locking tabs click firmly into place. Reconnect the negative battery terminal.
7. Perform Security Relearn (CRITICAL): You must perform a security relearn procedure (often called a Passlock or VATS relearn) for the truck to start. This syncs the new PCM with your vehicle’s anti-theft system. The typical procedure is: Turn the key to ‘ON’ for 10-15 minutes, then ‘OFF’ for 10 seconds. Repeat this cycle 3 times. On the fourth try, the vehicle should start.

Verified Vehicle Compatibility

This module is a direct replacement for service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. It fits a wide range of GM trucks and SUVs. Please verify your model and year below.

Note: For some 2004 models, please verify your ID matches 12602802. For 2007 models, this fits the ‘Classic’ body style with the creased door skin.