Is Your 2006 Hummer H3 Running Rough?
The Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is the central computer of your 2006 Hummer H3. It manages everything from fuel injection and ignition timing to transmission shifting and emissions control. When this critical component begins to fail, it can cause a wide range of frustrating and often confusing symptoms, leaving your rugged H3 feeling unreliable. From stalling at intersections to a persistent check engine light, a faulty PCM can sideline your vehicle and disrupt your daily life.
This replacement Powertrain Control Module is the definitive solution to restore your vehicle’s original performance and reliability. We take the guesswork out of the repair by programming the module specifically to your vehicle’s Vehicle Identification Number (VIN) before it ships. This ensures that it has the correct factory software and calibrations for your H3’s specific configuration, making the installation process as straightforward as possible.
From the Diagnostic Bay
We had a 2006 H3 come into the shop that was a real head-scratcher. The owner complained of intermittent stalling, no-start conditions, and a check engine light that would come and go. We checked the battery, alternator, and fuel pump—all tested fine. The codes were all over the place, pointing to various sensor communication errors. After hours of chasing wires, we finally hooked up a scope to the PCM’s main communication lines. We saw the data stream was dropping out sporadically. A replacement, VIN-programmed PCM was the final fix. The H3 fired right up and ran perfectly, proving that even the toughest trucks rely on a healthy computer.
Diagnosing a Failing 2006 Hummer H3 PCM
If you’re experiencing any of the following issues, a failing powertrain module could be the culprit. A proper diagnosis is always recommended, but these are the most common indicators that your H3’s computer is on its way out.
- ✔ Check Engine Light: The most obvious sign. Codes may relate to internal module failure, memory errors, or communication faults (like U-codes).
- ✔ Engine Stalling or Misfiring: The engine may stall unexpectedly while driving or at idle. You might also notice rough idling or engine misfires.
- ✔ No-Start Condition: The engine cranks but refuses to start. This can happen if the PCM isn’t properly controlling the fuel injectors or ignition coils.
- ✔ Poor Fuel Economy: A failing module can’t efficiently manage the engine’s fuel delivery, leading to a noticeable drop in MPG.
- ✔ Harsh or Incorrect Shifting: The PCM also controls the transmission. You may experience delayed, hard, or erratic shifting patterns.
- ✔ Communication Issues: Your diagnostic scan tool may be unable to communicate with the PCM, a clear sign of an internal fault.
A Simple, Reliable Solution
Don’t let a faulty computer keep your Hummer off the road. This module is a direct-fit replacement for your original unit, designed to meet or exceed OEM specifications. The key benefit is our VIN programming service. Simply provide your VIN during checkout, and our technicians will flash the module with the latest GM-certified software for your exact vehicle. This critical step ensures compatibility and helps avoid complex and expensive trips to the dealership for programming.
This module is a direct replacement for the following part numbers: 12569773, 12588650, 12589311, 12589585, 12591647, 12591648, 12593531, 12593532, 12594430, 12594431, 12596783, 12596784, 12597521, 12597776, 12597777, 12600818, 12604438, 12604439, 12606369, 12606373, 12606374, 12606398, 12606399, 19209820, 19209821.
This part will fit these makes and models with these options:
- 2006 HUMMER H3 (RH firewall)
- 2004-2006 CHEVROLET COLORADO (RH firewall)
- 2004-2006 GMC CANYON (RH firewall)
- 2006 BUICK RAINIER (4.2L, LH engine)
- 2006 CHEVROLET TRAILBLAZER (4.2L, LH engine)
- 2006 CHEVROLET TRAILBLAZER EXT (4.2L, LH engine)
- 2006 GMC ENVOY (4.2L, LH engine)
- 2006 GMC ENVOY XL (4.2L, LH engine)
- 2006 ISUZU ASCENDER (4.2L, LH engine)
- 2006 ISUZU I-280 (RH firewall)
- 2006 ISUZU I-350 (RH firewall)
- 2006 SAAB 9-7X (6 cylinder, LH engine)
Frequently Asked Questions
Do I need to do anything after installing this PCM?
Because this module is pre-programmed to your VIN, it is designed to be a simple installation. However, on many GM vehicles, you may need to perform a security relearn procedure (often called Passlock or Passkey) and a Crankshaft Variation Relearn (CASE relearn). These procedures can typically be done without special tools and instructions are widely available online.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot program and ship your module until we receive this information. Please double-check your VIN for accuracy.
Is this a plug-and-play part?
Yes, this is as close to plug-and-play as it gets. The VIN programming handles the software side. You simply need to disconnect the battery, swap the module, reconnect the battery, and perform any necessary relearn procedures.
Will this fix my check engine light?
If the check engine light and associated codes are caused by a faulty PCM, this replacement unit will solve the problem. It’s crucial to ensure your vehicle’s issues have been correctly diagnosed as a module failure before ordering.
Where is the PCM located on my 2006 Hummer H3?
On the 2006 Hummer H3, the Powertrain Control Module is typically located in the engine bay, mounted to the right-hand (passenger side) firewall.