2006 HUMMER H3 Powertrain Control Module (PCM) 19209821 – Programmed to Your VIN

Struggling with erratic engine performance in your 2006 HUMMER H3? Imagine heading off-road only to face sudden power loss or a stubborn check engine light that ruins the adventure. As a seasoned automotive repair advisor with over two decades in diagnostics and parts, I’ve seen how a faulty powertrain control module (PCM) can turn a reliable SUV into a headache. This pre-programmed PCM, part number 19209821, arrives ready for your vehicle with the latest GM software updates, matched precisely to your VIN for seamless integration. Let’s dive into how this replacement restores your H3’s performance and gets you back on the trail.

Key Features & Benefits

This PCM stands out because we program it specifically for your 2006 HUMMER H3 using your provided VIN. That means it incorporates the most recent GM calibrations, ensuring optimal engine timing, fuel efficiency, and emissions control. Unlike generic units, this one eliminates compatibility glitches right out of the box.

• Latest Software Flashing: Addresses known factory bugs, improving throttle response and reducing idle roughness.
• Broad Compatibility: Replaces multiple part numbers including 12569773, 12588650, 12589311, and more up to 19209821, making it a versatile fix for various GM models.
• Enhanced Reliability: Boosts overall drivability, especially in demanding conditions like towing or off-roading, where precise control prevents overheating or shifting delays.
• Quick Turnaround: Provide your VIN post-purchase, and we ship it programmed—saving you trips to the dealer.

From my experience, owners often notice better fuel economy and smoother acceleration after installation. For instance, if your H3 hesitates during highway merges, this PCM recalibrates sensors to deliver consistent power.

Common Issues & How This Fixes Them

Powertrain control modules in the 2006 HUMMER H3 commonly fail due to electrical surges, corrosion, or age-related wear. Symptoms include the engine failing to start, intermittent stalling, or diagnostic trouble codes (DTCs) like P0601 (internal control module memory error) or P2135 (throttle position sensor correlation). I’ve diagnosed these in countless H3s, often tracing back to water intrusion near the right-hand firewall mounting location.

Picture this: You’re navigating a muddy trail when your H3 suddenly loses power, triggering a P0120 DTC for throttle pedal position issues. A failing PCM misreads sensor data, causing these disruptions. This replacement PCM resolves that by providing fresh, updated circuitry and programming that clears persistent codes and restores accurate signal processing.

Another frequent problem? Rough shifting in the automatic transmission, linked to DTC P0700 (transmission control system malfunction). The new module recalibrates communication between the engine and transmission, smoothing out gears and preventing limp mode. Expert tip: Before swapping, scan for codes with an OBD-II tool—I’ve found that addressing related sensors first maximizes the fix’s effectiveness.

In wet weather scenarios, corrosion on PCM connectors can lead to misfires (DTC P0300). This unit’s pre-flashed setup ensures robust protection against such failures, drawing from GM’s refined updates to enhance moisture resistance.

Easy Installation Guide

Installing this PCM in your 2006 HUMMER H3 is straightforward for DIY enthusiasts or pros. Locate it on the right-hand firewall under the hood. Disconnect the battery first to avoid shorts—safety always comes first.

1. Remove the negative battery cable and wait 10 minutes for capacitors to discharge.
2. Unplug the wiring harnesses from the old PCM, noting their positions.
3. Unscrew the mounting bolts and swap in the new unit.
4. Reconnect everything, then clear any stored codes with a scan tool.
5. Start the engine and monitor for smooth operation; a quick test drive confirms the fix.

Pro tip: Apply dielectric grease to connectors to prevent future corrosion, especially in humid climates. If you’re not comfortable, a local shop can handle it in under an hour.

Fitment Details

This PCM fits perfectly in the 2006 HUMMER H3, mounted on the right-hand firewall. It also works with similar GM vehicles sharing the 4.2L engine platform, ensuring cross-compatibility without modifications.

Compatible with:

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

Verify your part number against the list; always provide your VIN for exact programming confirmation. This ensures no mismatches and optimal performance.

Don’t let a bad PCM sideline your HUMMER H3 any longer. Order this programmed 19209821 module today, supply your VIN, and experience reliable powertrain control. Act now—your next off-road trip depends on it!