Restore Peak Performance to Your GM Truck or SUV
Is your 2003-2007 HUMMER H2 or other GM truck suffering from baffling issues like stalling, erratic shifting, or a persistent Check Engine Light? The Powertrain Control Module (PCM), the electronic brain of your vehicle, is often the culprit. When it fails, it can create a cascade of frustrating problems. This replacement PCM, part number 12582605, is the reliable, straightforward solution to get your vehicle back on the road and running like it should. We take the guesswork and hassle out of the repair by programming the module specifically for your vehicle using your VIN before it ever leaves our facility.
From the Diagnostic Bay: The Intermittent Stall Case
I remember a 2005 Silverado with the 6.0L that came into my shop with a problem that was driving the owner crazy. It would randomly stall at red lights, but not always. It had a P0601 (Internal Control Module Memory Check Sum Error) code that would come and go. The owner had already replaced the crank sensor and checked fuel pressure, which was perfect. After confirming all power and grounds to the PCM were solid, we knew the module itself was failing internally. We installed a VIN-programmed PCM just like this one. The installation and security relearn took less than 30 minutes. The truck never stalled again. This is a classic failure scenario for these modules, and this part is the definitive fix.
What Makes This the Smart Choice?
Unlike a generic module from a parts store or salvage yard, this unit arrives ready for installation. We flash it with the latest official GM software updates, which can often resolve factory-known bugs and improve overall performance and fuel efficiency. By providing your VIN at checkout, you eliminate the need for an expensive trip to the dealership for programming. This is the most efficient way to replace a faulty 2003-2007 HUMMER H2 PCM and restore your vehicle’s core functions.
Is Your Truck Showing These Signs of a Bad PCM?
- âś” Persistent Check Engine Light (CEL) with codes like P0601, P0602, P0606, or other communication errors (U-codes).
- âś” The engine cranks but refuses to start.
- âś” Unexplained drops in fuel economy.
- âś” Harsh or erratic automatic transmission shifting.
- âś” Engine stalling, stumbling, or misfiring for no apparent reason.
- âś” Failure to pass an emissions inspection.
A Straightforward Guide to Installation
- âś” Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- âś” Locate the PCM: On most compatible trucks and SUVs (including the Hummer H2, Silverado, and Sierra), the PCM is located in the engine bay on the driver’s side, under or next to the battery and inside a black plastic bracket.
- âś” Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Once disconnected, unbolt the PCM and its bracket to remove it from the vehicle.
- âś” Install the New Module: Place your new, pre-programmed PCM into the bracket and mount it back in the vehicle. Securely plug in all electrical connectors, ensuring they click into place.
- âś” Reconnect Power: Reattach the negative battery terminal.
- âś” Perform Security Relearn: You will need to perform a simple security relearn procedure so the vehicle recognizes the new PCM. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. Your vehicle’s service manual will have the exact steps.
By choosing this pre-programmed 2003-2007 HUMMER H2 PCM, you’re not just buying a part; you’re buying a complete, hassle-free solution that saves you time and money.
Verified Vehicle Compatibility
This module, service number 12582605, is a direct replacement for several original part numbers, including 89017750, 12589463, 12602802, 89017734, and 28042802. It fits a wide range of GM vehicles. Please verify your model and year from the list below:
ESCALADE 03-06
ESCALADE ESV 03-06
ESCALADE EXT 03-06
Chevrolet:
AVALANCHE 1500 03-06
SILVERADO 1500 PICKUP 03-07 (Classic Style)
SILVERADO 2500 PICKUP 03-07 (Classic Style, Gasoline 6.0L)
SILVERADO 3500 PICKUP 03-07 (Classic Style, Gasoline 6.0L)
SSR 03
SUBURBAN 1500 03-06
SUBURBAN 2500 03-06 (6.0L)
TAHOE 03-06
TRAILBLAZER EXT 03 (5.3L)
GMC:
ENVOY XL 03 (5.3L)
SIERRA 1500 PICKUP 03-07 (Classic Style)
SIERRA 2500 PICKUP 03-07 (Classic Style, Gasoline 6.0L)
SIERRA 3500 PICKUP 03-07 (Classic Style, Gasoline 6.0L)
SIERRA DENALI 03-07 (Classic Style)
YUKON 03-06
YUKON XL 1500 03-06
YUKON XL 2500 03-06 (6.0L)
HUMMER:
HUMMER H2 03-07
Isuzu:
ASCENDER 03 (5.3L)
Note: For some 2004 models, please verify your original module ID is 12602802 for guaranteed compatibility. If you have questions, please contact us with your VIN.
Frequently Asked Questions about this 2003-2007 HUMMER H2 PCM
Why do you need my VIN?
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the PCM with the exact software and calibrations for your truck’s specific engine, transmission, and options. This ensures it works perfectly right out of the box, just like a module from the dealer.
Is any additional programming required after installation?
No. The main engine and transmission programming is complete. However, you will need to perform a simple, tool-free “Security Relearn Procedure” that syncs the new PCM to your vehicle’s anti-theft system. This process takes about 30 minutes and instructions are readily available online or in your owner’s manual.
Will this fix my specific problem?
This module will correct issues directly caused by a failing PCM, such as internal processor faults (P0601), communication errors, and erratic engine/transmission behavior. While it solves many common problems, it’s essential to ensure the PCM has been correctly diagnosed as the root cause of your issue.
Where is the PCM located on my Hummer H2?
On the 2003-2007 Hummer H2, the Powertrain Control Module (PCM) is located in the engine compartment on the driver’s side, just behind the battery inside a protective plastic housing.