Is Your Hummer H3 Running Rough? The PCM Might Be the Culprit.
The Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is the central computer of your 2007 Hummer H3. It manages everything from fuel injection and spark timing to transmission shifting and emissions control. When this critical component begins to fail, it can cause a wide range of frustrating and difficult-to-diagnose issues. You might experience a persistent check engine light, sudden stalling, poor acceleration, or a noticeable drop in fuel economy. These aren’t just annoyances; they’re signs that your vehicle’s brain is struggling to keep everything in sync.
Ignoring a failing PCM can lead to more severe engine damage, failed emissions tests, and an unreliable vehicle. This replacement module, part number 19210067 (also interchangeable with 12602010), is the definitive solution to restore your vehicle’s factory performance and reliability. We take the guesswork out of the repair by pre-programming the module to your vehicle’s specific Vehicle Identification Number (VIN). This ensures that it communicates perfectly with all other systems in your Hummer, just as the original did. By providing us with your VIN upon purchase, you receive a unit that is ready for installation, loaded with the latest software updates from GM for optimal performance and efficiency.
From the Diagnostic Bay
We had a 2007 Hummer H3 come into the shop with a very erratic issue. The owner complained of intermittent stalling at stoplights and a strange hesitation during acceleration, but there were no consistent trouble codes—just a generic P0606 (PCM Processor Fault) that would come and go. We checked the wiring, fuel pressure, and sensors, but everything tested fine. After hours of diagnostics, we suspected the PCM itself was failing internally. We installed one of our VIN-programmed modules, and the difference was immediate. The engine idled smoothly, the hesitation was gone, and the phantom code never returned. It’s a classic case where the vehicle’s central computer was the weak link, and a direct replacement was the only correct fix.
Symptoms of a Failing 2007 Hummer H3 PCM
- ✔ Check Engine Light: The most common symptom, often with communication-related or processor-fault codes (e.g., U-codes, P0600-P0606).
- ✔ Engine Stalling or Misfiring: The engine may stall for no apparent reason, either while driving or at idle. You might also notice rough idling or misfires.
- ✔ No-Start Condition: The engine cranks but refuses to start, indicating the PCM isn’t properly managing the fuel or spark systems.
- ✔ Poor Fuel Economy: An inefficiently running engine, managed by a faulty PCM, will often consume more fuel than usual.
- ✔ Erratic Transmission Shifting: The PCM also controls transmission functions, and a failure can lead to harsh shifts, delayed engagement, or getting stuck in one gear.
- ✔ Failed Emissions Test: Improper engine management will almost certainly cause your vehicle to fail a state emissions inspection.
Plug-and-Play Solution with VIN Programming
Replacing an automotive computer isn’t like swapping out an air filter. Each vehicle has unique parameters based on its specific options and build. That’s why our service is essential. This isn’t a generic, one-size-fits-all module. We flash this genuine GM 2007 Hummer H3 PCM with the latest factory software calibrated precisely to your vehicle’s VIN. This critical step ensures all onboard systems, from the anti-lock brakes to the instrument cluster, function correctly with the new module. The process is simple: place your order, provide your VIN, and we handle the complex programming. The module you receive will be ready to install, minimizing vehicle downtime and eliminating the need for an expensive trip to the dealership for programming.
Guaranteed Fitment
This Electronic Control Module is a direct replacement for part number 19210067 and fits a wide range of GM trucks and SUVs. Please verify your vehicle is on the list below:
- 2007 HUMMER H3 (RH firewall)
- 2007-2008 ISUZU ASCENDER (4.2L, LH engine)
- 2007 ISUZU I-370 (RH firewall)
- 2007 ISUZU I-290 (RH firewall)
- 2007-2008 CHEVROLET TRAILBLAZER (4.2L, LH engine)
- 2007-2008 GMC ENVOY (4.2L, LH engine)
- 2007 CHEVROLET COLORADO (RH firewall)
- 2007 GMC CANYON (RH firewall)
- 2007 BUICK RAINIER (4.2L, LH engine)
- 2007-2008 SAAB 9-7X (4.2L / 6 cylinder, LH engine)
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM) is the main computer that controls your vehicle’s engine and transmission systems. It reads data from dozens of sensors to manage fuel delivery, ignition timing, emissions systems, and automatic transmission shift points to ensure optimal performance, fuel efficiency, and low emissions.
Do I need to get this module programmed?
No. We handle all the programming for you before shipment. Simply provide us with your vehicle’s 17-digit VIN during or after checkout, and we will load the correct GM factory software onto the module. It will arrive ready for installation.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the existing PCM, then yes, this replacement part will solve the issue. However, it’s crucial to properly diagnose the vehicle first, as the light could be on for other reasons, such as a faulty sensor or wiring issue.
Is any additional setup required after installation?
In many cases, you can install the module and start the vehicle. However, some GM vehicles may require a Crankshaft Position System Variation (CASE) relearn procedure to be performed. This synchronizes the new PCM with the engine’s crankshaft sensor for precise misfire detection. This procedure can often be done by a qualified mechanic with a capable scan tool.
Where is the PCM located on my 2007 Hummer H3?
On the 2007 Hummer H3, as well as the Colorado and Canyon, the Electronic Control Module is typically located in the engine bay, mounted to the right-hand (passenger side) firewall.