Is Your 2006 Hummer H3 Running Rough? The PCM Might Be the Culprit.
If you’re experiencing frustrating issues like a persistent check engine light, erratic engine behavior, poor fuel mileage, or even a no-start condition in your 2006 Hummer H3, a failing Powertrain Control Module (PCM) is a very likely cause. As the central computer of your vehicle, the PCM is responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions controls. When it begins to fail, it can create a cascade of problems that are often difficult to diagnose.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take a quality, tested module and program it specifically to your vehicle’s Vehicle Identification Number (VIN). This ensures that all factory settings, security information (anti-theft), and operational parameters are a perfect match for your H3. We also flash it with the latest, most stable software updates from General Motors, which can resolve common drivability issues and improve overall performance and efficiency. By providing us with your VIN, you bypass the need for an expensive trip to the dealership for programming.
From the Diagnostic Bay
We had a 2006 Hummer H3 come into the shop that was a real head-scratcher. The owner complained of random stalling at stoplights and a transmission that would sometimes refuse to shift out of second gear. There were no consistent trouble codes, just a few intermittent communication errors that would come and go. We checked the wiring, sensors, and even the transmission fluid. Everything seemed fine. On a hunch, we connected a scope to the PCM’s main communication lines and saw a noisy, erratic signal. We swapped in one of our pre-programmed PCMs, and it was like a different truck. The stalling vanished, the transmission shifted perfectly, and even the idle smoothed out. It’s a classic example of how a failing PCM can create multiple, seemingly unrelated symptoms.
Common Symptoms of a Faulty PCM
- ✔ Persistent Check Engine Light (CEL) that won’t clear or returns immediately.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Rough or inconsistent idling.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Vehicle entering ‘limp mode’ with reduced power.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
- ✔ Failure to communicate with a diagnostic scan tool.
Why Choose Our Programmed 2006 Hummer H3 PCM?
Getting your H3 back on the road shouldn’t be a complicated ordeal. Our process is designed to be simple and effective. You provide your VIN, and we handle the complex programming. The module you receive is a direct-fit replacement for part number 12594430 and many others, ensuring a hassle-free installation. Located on the right-hand (passenger side) firewall, swapping the module is a straightforward job for a DIY mechanic with basic tools. Once installed, your vehicle’s systems will communicate correctly, restoring the performance and reliability you expect.
Guaranteed Compatibility
This electronic control module is a direct replacement for a wide range of part numbers, ensuring broad compatibility. It is guaranteed to fit the following vehicles:
- 2006 HUMMER H3 (Electronic Control Module; RH firewall)
- 2004-2006 CHEVROLET COLORADO (Electronic Control Module; RH firewall)
- 2004-2006 GMC CANYON (Electronic Control Module; RH firewall)
- 2006 BUICK RAINIER (Electronic Control Module; LH engine, 4.2L)
- 2006 CHEVROLET TRAILBLAZER & TRAILBLAZER EXT (Electronic Control Module; LH engine, 4.2L)
- 2006 GMC ENVOY & ENVOY XL (Electronic Control Module; 4.2L, LH engine)
- 2006 ISUZU ASCENDER (Electronic Control Module; 4.2L, LH engine)
- 2006 ISUZU I-280 (Electronic Control Module; RH firewall)
- 2006 ISUZU I-350 (Electronic Control Module; RH firewall)
- 2006 SAAB 9-7X (Electronic Control Module; LH engine, 6 cylinder)
This unit replaces 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.
Frequently Asked Questions
Do I need to do any programming myself?
No. This module comes fully programmed to your vehicle’s specific VIN. It is ready for installation right out of the box, saving you a trip to the dealership.
Where do I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on the driver’s side of the dashboard visible through the windshield.
How do I provide my VIN after I order?
After completing your purchase, simply send us a message with your VIN, or add it as a note during the checkout process. We cannot ship your order until we receive the VIN.
Will this fix my specific problem?
This PCM will correct any issues directly caused by a faulty module. While it resolves the vast majority of electronic engine and transmission problems, it’s essential to ensure your vehicle has been properly diagnosed, as other faulty sensors or wiring could cause similar symptoms.
Is any special procedure needed after installation?
After installing the module, you may need to perform a security relearn or CASE (Crankshaft Angle Sensor Error) relearn procedure. This can often be done without special tools and instructions are widely available online, or your mechanic can perform it quickly.