Restore Peak Performance to Your Hummer H3
Is your 2006 Hummer H3 acting possessed? Unexplained check engine lights, erratic idling, poor fuel mileage, or frustrating no-start conditions can often be traced back to one component: the Powertrain Control Module (PCM). As the central brain of your vehicle, the PCM orchestrates everything from fuel injection and spark timing to transmission shifting. When it starts to fail, it can send you on a wild goose chase, replacing perfectly good sensors without ever solving the root problem.
This isn’t just another part; it’s the definitive solution. We provide a fully tested 2006 Hummer H3 Powertrain Control Module that is professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN). This critical step ensures that the module communicates flawlessly with all other systems in your truck, right out of the box. We load the latest GM-certified software, which often includes vital improvements for drivability and emissions that your original module may be missing.
Case Study: A Tricky Diagnosis
I remember a 2006 H3 that rolled into my shop with a laundry list of complaints. The owner had already replaced two oxygen sensors and a MAP sensor based on the codes, but the check engine light kept coming back, and the transmission had a harsh 2-3 shift. A deep dive with the scan tool showed intermittent communication loss with the PCM (a classic U-code). Instead of throwing more parts at it, we tested the PCM’s power and ground circuits, which were solid. The diagnosis pointed to internal failure. After installing one of our VIN-programmed modules, every single code vanished, the transmission shifted like new, and the engine ran smoothly. It’s a textbook example of how a failing ‘brain’ can create phantom pains throughout the vehicle’s nervous system.
Is Your Hummer H3 Showing These PCM Failure Signs?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, this module is the likely solution your vehicle needs.
- ✔ Persistent Check Engine Light (CEL)
- ✔ Diagnostic Trouble Codes (DTCs) for internal module failure, like P0601, P0605, or P0606
- ✔ Unexplained sensor codes that return after replacing the sensor
- ✔ Vehicle refuses to start or stalls intermittently
- ✔ Noticeable decrease in fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Failure to pass an emissions test
- ✔ Loss of communication with the scan tool
A Straightforward Guide to Installation
Installing your new 2006 Hummer H3 Powertrain Control Module is a manageable job for a DIY enthusiast or any professional mechanic. Since it arrives programmed, you won’t need a high-end scan tool for setup.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes before starting work.
- Locate the Module: On the 2006 Hummer H3, the PCM is typically located on the right-hand (passenger) side of the firewall in the engine bay.
- Disconnect the Connectors: Carefully unlatch and remove the electrical connectors from the old PCM. Inspect them for any corrosion or damage.
- Remove the Old PCM: Unbolt the module from its mounting bracket. Keep the hardware as you will need it for the new unit.
- Install the New PCM: Mount your new, pre-programmed module in place using the original hardware.
- Reconnect Everything: Securely plug the electrical connectors into the new PCM. Reconnect the negative battery terminal.
- Perform Security Relearn: You may need to perform a simple key-cycle security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. This allows the vehicle’s anti-theft system to recognize the new PCM.
Verified Vehicle Compatibility
This module is a direct replacement for a wide range of GM vehicles and part numbers. Please confirm your vehicle is on this list. Upon purchase, we will ask for your VIN to ensure 100% correct programming.
This module fits the following vehicles:
- HUMMER H3: 2006 (RH firewall)
- Chevrolet Colorado: 2004-2006 (RH firewall)
- GMC Canyon: 2004-2006 (RH firewall)
- Chevrolet Trailblazer & Trailblazer EXT: 2006 (4.2L, LH engine)
- GMC Envoy & Envoy XL: 2006 (4.2L, LH engine)
- Buick Rainier: 2006 (4.2L, LH engine)
- Isuzu Ascender: 2006 (4.2L, LH engine)
- Isuzu I-280 & I-350: 2006 (RH firewall)
- Saab 9-7X: 2006 (6 cylinder)
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
Is this module ready to install when it arrives?
Yes! This is a key benefit of our service. We program the module with your vehicle’s VIN and the latest software before shipping. In most cases, you will only need to perform a simple security relearn procedure after installation, which does not require any special tools.
Why do you need my VIN?
Your VIN is essential for programming the PCM correctly. It contains specific information about your vehicle’s engine, transmission, emissions system, and other options. Programming with the VIN ensures the module works seamlessly with your H3, just like the original one from the factory.
Where is the PCM located on my 2006 Hummer H3?
On the 2006 H3, the Powertrain Control Module is located in the engine compartment, mounted to the firewall on the passenger’s side.
Will this fix my transmission shifting problems?
If the shifting issues are caused by faulty signals or processing within the PCM, then yes, this module will resolve them. The PCM controls transmission line pressure and shift points. However, this will not fix internal mechanical failures within the transmission itself.