Programmed 2006 HUMMER H3 PCM 19209820

Is your 2006 HUMMER H3 giving you headaches with erratic behavior? Maybe it’s a no-start condition one day and poor fuel economy the next. As a technician with over two decades of experience, I’ve seen these exact issues countless times, and they often point directly to a failing Powertrain Control Module (PCM). This isn’t just a part; it’s the brain of your vehicle’s engine and transmission, and when it falters, everything feels wrong. That’s why we offer this direct-fit 2006 HUMMER H3 PCM, professionally flashed with the latest GM software and programmed specifically to your vehicle’s VIN before it ever leaves our facility.

Forget the expensive trip to the dealership and the hassle of coordinating programming. You’re getting a reliable, fully updated module that’s ready for installation right out of the box. This component is the definitive solution for restoring your H3’s original performance, throttle response, and transmission shifting patterns. We take the guesswork out of the repair, so you can get your rugged H3 back on the road and running like it should.

From the Diagnostic Bay: The Intermittent H3 Stall

A customer brought in a 2006 H3 with a problem that was driving him crazy: it would randomly stall at stoplights, but not always. There were no consistent trouble codes, just a history of a U0100 (Lost Communication with ECM/PCM) code that would come and go. We checked grounds, wiring, and power feeds—all solid. After hours on the diagnostic scanner, I noticed the live data stream for several key engine sensors would freeze for a split second right before a stall. This pointed to an internal processor fault in the PCM. Swapping in a properly programmed module like this one solved the issue instantly. It’s a classic example of how a failing PCM can cause ghost-like problems that are nearly impossible to trace in the wiring.

Is Your HUMMER H3 Showing These PCM Failure Signs?

A faulty PCM can manifest in various ways. If you’re experiencing any of the following, a failing module is a likely culprit. In my shop, these are the tell-tale signs I look for:

✔ Check Engine Light is illuminated with codes like P0601 (Internal Control Module Memory Check Sum Error), P0606 (ECM/PCM Processor Fault), or communication codes like U0100.
✔ The engine cranks but refuses to start.
✔ Unexplained drops in fuel efficiency.
✔ Harsh or erratic automatic transmission shifting.
✔ The vehicle stalls unexpectedly while driving or at idle.
✔ Noticeable loss of power and poor acceleration.

A Straightforward Guide to Installation

Replacing the PCM on your H3 is a manageable job for a DIYer. Here’s a simple process to follow:

Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes for the system to fully discharge.
Locate the Module: On the 2006 Hummer H3, the PCM is located in the engine bay, mounted to the firewall on the passenger’s side (RH side).
Disconnect 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 on the firewall.
Install the New PCM: Mount your new, pre-programmed module in place and securely fasten the bolts.
Reconnect Everything: Plug the electrical connectors back into the new PCM, ensuring they click into place. Reconnect the negative battery terminal.
Perform Security Relearn: In many cases, you will need to perform a simple security relearn procedure (often called a Passlock relearn) to sync the new PCM with your vehicle’s anti-theft system. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Consult your owner’s manual or a reliable online resource for the specific procedure for your vehicle.

Verified Vehicle Compatibility

This module is a direct replacement for part number 19209820 and a wide range of other GM part numbers. It is guaranteed to fit the following vehicles:

✔ HUMMER H3: 2006 (RH firewall)
✔ Chevrolet Colorado: 2004-2006 (RH firewall)
✔ GMC Canyon: 2004-2006 (RH firewall)
✔ Buick Rainier: 2006 (4.2L, LH engine)
✔ Chevrolet Trailblazer & Trailblazer EXT: 2006 (4.2L, LH engine)
✔ GMC Envoy & Envoy XL: 2006 (4.2L, LH engine)
✔ Isuzu Ascender: 2006 (4.2L, LH engine)
✔ Isuzu I-280: 2006 (RH firewall)
✔ Isuzu I-350: 2006 (RH firewall)
✔ Saab 9-7X: 2006 (6 cylinder, ID 12569773 or 12597521, LH engine)