Restore Peak Performance and Reliability to Your GM Truck
Is your Silverado, Sierra, or Tahoe suffering from frustrating issues like a persistent check engine light, erratic shifting, a no-start condition, or poor fuel economy? These are classic signs of a failing Powertrain Control Module (PCM), the computer that serves as the brain for your vehicle’s engine and transmission. Don’t let a faulty module keep you off the road. This direct-fit replacement PCM is the definitive solution to restore your truck’s original performance and dependability.
We take the guesswork and extra cost out of the repair. Unlike parts from a salvage yard or a big-box store, this module arrives at your door pre-programmed with the latest official GM software updates, specifically matched to your truck’s Vehicle Identification Number (VIN). This means no expensive trips to the dealership for programming—it’s ready for installation right out of the box. Getting your truck back to factory-spec operation has never been easier.
A Technician’s Notebook: The Ghost in the Machine
I once had a 2005 Sierra 1500 in my bay that was driving the owner crazy. It would randomly stall at stoplights, but never throw a consistent code. Sometimes we’d see a U0100 (Lost Communication with ECM/PCM), other times nothing. We checked all the usual suspects—battery, alternator, grounds, and wiring harnesses—and everything tested perfectly. After hours of diagnostics, we swapped in a known-good, programmed PCM. The random stalling vanished instantly. The original module had an internal processor fault that only occurred under specific thermal conditions, making it nearly impossible to pin down. It’s a textbook example of how a failing 2003-2007 Silverado 1500 PCM can create phantom problems that defy normal diagnosis.
Is Your Truck Showing These Symptoms?
A failing PCM can cause a wide range of issues. If you’re experiencing any of the following, this module is likely the solution you need:
- ✔ Check Engine Light is illuminated with codes like P0601, P0606, or other communication errors.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel efficiency.
- ✔ Rough or unstable idling.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Vehicle fails to pass an emissions test.
- ✔ Intermittent stalling or loss of power while driving.
A Straightforward Guide to Installation
Installing your new 2003-2007 Silverado 1500 PCM is a job most DIYers can handle in their own driveway. Follow these steps for a smooth installation process.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental reconnection.
- 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.
- Disconnect the Connectors: Carefully unclip and remove the electrical wiring harness connectors from the old module. These connectors have locking tabs that need to be released before pulling. Avoid forcing them.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. It’s typically held in place by a few bolts (commonly 10mm or 13mm).
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and secure the bolts. Reconnect the wiring harness connectors, ensuring they click firmly into place.
- Reconnect the Battery: Reattach the negative battery terminal.
- Perform Security/CASE Relearn: After installation, you will need to perform a security relearn procedure (often called Passlock or VATS) for the vehicle to start. Additionally, a Crankshaft Variation (CASE) relearn with a capable scan tool is required to prevent a P1336 trouble code and ensure optimal engine performance.
Verified Vehicle Compatibility
This module is a direct replacement for a wide range of General Motors trucks and SUVs. It is compatible with service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. Please verify your vehicle is on the list below. For some models, matching the ID number is required.
ENVOY XL 03 (5.3L)
ESCALADE 03-06
ESCALADE ESV 03-06
ESCALADE EXT 03-06
HUMMER H2 03-07
ISUZU ASCENDER 03 (5.3L)
SIERRA 1500 PICKUP 03-07 (Classic)
SIERRA 2500 PICKUP 03-07 (Classic, Gas)
SIERRA 3500 PICKUP 03-07 (Classic, Gas)
SIERRA DENALI 03-07 (Classic)
SILVERADO 1500 PICKUP 03-07 (Classic)
SILVERADO 2500 PICKUP 03-07 (Classic, Gas)
SILVERADO 3500 PICKUP 03-07 (Classic, Gas)
SSR 03
SUBURBAN 1500 03-06
SUBURBAN 2500 03-06 (6.0L)
TAHOE 03-06
TRAILBLAZER EXT 03 (5.3L)
YUKON 03-06
YUKON XL 1500 03-06
YUKON XL 2500 03-06 (6.0L)
Frequently Asked Questions
Why do you need my VIN?
Why do you need my VIN?
We require your Vehicle Identification Number (VIN) to program the module with the exact software and calibrations your vehicle needs. This ensures perfect compatibility with your engine, transmission, and other options, and includes the latest updates from GM for optimal performance.
Is this a simple plug-and-play installation?
Almost. While the physical installation is plug-and-play, you must perform a security relearn procedure after installation for the vehicle to recognize the new PCM and start. A CASE (Crankshaft Variation) relearn with a scan tool is also necessary to clear certain trouble codes and ensure smooth operation.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM (e.g., codes P0601, P0606), then yes, this part will resolve the issue. However, if the light is on for another reason, such as a bad sensor, you will still need to diagnose and repair that separate problem.
How long does it take to program and ship?
Programming is typically completed within one business day of receiving your VIN. Once programmed, the module is shipped out promptly. Please provide your VIN during or immediately after checkout to avoid delays.