Restore Your Truck’s Performance and Reliability
Is your 2003-2007 HUMMER H2 or GM truck suffering from frustrating issues like a persistent check engine light, erratic engine behavior, or a complete no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the central computer of your vehicle. A faulty PCM can disrupt everything from fuel delivery and ignition timing to transmission shifting, leaving you stranded and facing a costly diagnostic puzzle. This replacement PCM is the direct, reliable solution to get your vehicle running like new again.
We take the guesswork and hassle out of the repair. Unlike a generic module from a parts store, this unit arrives at your door pre-programmed with the latest official GM software, specifically matched to your vehicle’s VIN. This means no expensive trips to the dealership for programming. It’s a straightforward fix designed for both professional technicians and capable DIYers who want to restore their vehicle’s core functionality and peace of mind.
From the Diagnostic Bay: The Intermittent No-Start Nightmare
I remember a 2006 Silverado 2500 that came into my shop on a tow truck. The owner was at his wit’s end. The truck would start and run perfectly for weeks, then suddenly refuse to start for a day. He had already replaced the battery, starter, and crank sensor. We checked fuel pressure and spark—both were fine when it was running, but absent during the no-start episodes. The scanner showed intermittent U0100 (Lost Communication with ECM/PCM) codes. After hours of chasing wires, we finally pinpointed the issue: the PCM itself was failing internally, but only when it reached a certain temperature. We swapped in a VIN-programmed PCM like this one, and the problem was solved instantly. It’s a reminder that sometimes the ‘brain’ is the source of the most elusive electrical gremlins.
Is Your Truck Showing These PCM Failure Signs?
- ✔ Check Engine Light is on with communication-related codes.
- ✔ Common Diagnostic Trouble Codes (DTCs) like P0601, P0606, or U0100.
- ✔ Engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine stalling, stumbling, or running rough for no apparent reason.
- ✔ Other modules on the vehicle cannot communicate with the PCM.
A Straightforward Guide to Your PCM Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- ✔ Locate the PCM: On most compatible models like the HUMMER H2 and Silverado/Sierra, the PCM is located in the engine bay on the driver’s side, often under or next to the battery tray.
- ✔ Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harnesses and pull them straight out from the PCM. There are typically multiple connectors; take note of their orientation.
- ✔ Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s usually held in place by a few small bolts.
- ✔ Install the New Module: Seat your new, pre-programmed PCM into the mounting bracket and secure it with the original bolts.
- ✔ Reconnect Everything: Firmly plug the wiring harnesses back into their correct sockets on the new module. You should hear or feel a click as they lock into place. Reconnect the negative battery terminal.
- ✔ Perform Security Relearn: While the module is programmed to your VIN, your vehicle’s anti-theft system may require a security relearn procedure. This can typically be done without special tools by cycling the key in the ignition. A quick search for your specific model’s “VATS relearn” or “security relearn” will provide the exact steps.
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 that for some 2004 models, matching the ID number 12602802 is critical.
- HUMMER H2: 2003, 2004, 2005, 2006, 2007
- Cadillac Escalade, ESV, EXT: 2003-2006
- Chevrolet Avalanche 1500: 2003-2006
- Chevrolet Silverado 1500, 2500, 3500: 2003-2007 (Classic Style)
- Chevrolet Suburban 1500, 2500: 2003-2006
- Chevrolet Tahoe: 2003-2006
- Chevrolet SSR: 2003
- GMC Sierra 1500, 2500, 3500 & Denali: 2003-2007 (Classic Style)
- GMC Yukon & Yukon XL 1500, 2500: 2003-2006
- GMC Envoy XL: 2003 (5.3L)
- Isuzu Ascender: 2003 (5.3L)
- Chevrolet Trailblazer EXT: 2003 (5.3L)
Frequently Asked Questions
How does the VIN programming work?
After you place your order, you will need to provide us with your vehicle’s 17-digit VIN. We use this to load the correct, factory-approved software and calibrations for your specific vehicle configuration before we ship the part. This ensures proper function of the engine, transmission, and all related systems.
Do I need to do anything after installing it?
In most cases, you will need to perform a security relearn procedure (also known as a VATS relearn). This syncs the new PCM with your vehicle’s anti-theft system and allows the engine to start. This procedure typically involves cycling the ignition key and does not require a scan tool. A Crankshaft Variation Relearn (CASE relearn) may be needed to clear a P1336 code, which does require a capable bidirectional scan tool, but the vehicle will run and drive without it.
Is this a new or used part?
This is a high-quality, tested replacement part that has been professionally prepared and programmed for your vehicle. It is guaranteed to restore your vehicle’s functionality.
Will this fix my transmission shifting problems?
If your shifting problems are caused by a faulty PCM, then yes. The PCM controls the transmission’s shift points and line pressure. A failing module can cause harsh shifts, delayed engagement, or incorrect gear selection. This part restores those critical functions.
How do I find my original part number to check compatibility?
Your original PCM’s part number is printed on a sticker on the module itself. You can cross-reference it with the compatible service numbers listed: 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802.