2004-2006 Colorado PCM 12597521 | Programmed to Your VIN | Engine Computer

Restore Your Truck’s Performance and Reliability

Is your 2004-2006 Chevy Colorado or GMC Canyon running rough, throwing confusing check engine lights, or refusing to start? A failing Powertrain Control Module (PCM) is often the culprit behind these frustrating and hard-to-diagnose issues. As the brain of your vehicle’s engine and transmission, a faulty PCM can cause a cascade of problems, from poor fuel economy and erratic shifting to a complete no-start condition. This isn’t just an inconvenience; it’s a reliability issue that can leave you stranded. Stop guessing with temporary fixes and get the definitive solution.

This replacement module is the answer. We provide a high-quality PCM that is professionally programmed to your truck’s specific Vehicle Identification Number (VIN). This critical step ensures seamless communication between all your vehicle’s systems, just like the original from the factory. We flash it with the latest, most stable GM software updates available, which often correct underlying factory bugs and improve overall performance and longevity. This is a direct-fit, plug-and-play solution designed to get you back on the road with confidence.

Is Your Truck Showing These Telltale Signs?

A failing PCM can manifest in various ways. If you’re experiencing any of the following, it’s a strong indicator that your engine computer needs attention:

• ✔ Check Engine Light is on with codes like P0601, P0606, or other internal processor faults.
• ✔ The engine cranks but refuses to start.
• ✔ Unexplained drops in fuel economy.
• ✔ The transmission shifts harshly, late, or not at all.
• ✔ The engine stalls, stumbles, or misfires intermittently.
• ✔ Loss of communication with the scan tool.
• ✔ Other modules on the vehicle setting U-codes (loss of communication with PCM).

A Straightforward Guide to Installation

Installing your new 2004-2006 Colorado PCM is a simple process that most DIYers can handle with basic tools. Follow these steps for a smooth installation.

1. Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
2. Locate the PCM: On the Colorado, Canyon, and H3, the PCM is typically located on the right-hand (passenger side) of the firewall in the engine bay. On Trailblazer/Envoy platforms, it’s on the left-hand (driver side) of the engine.
3. Disconnect the Connectors: Carefully unclip and remove the electrical wiring harnesses from the old PCM. Inspect the connectors for any corrosion or damage.
4. Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
5. Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely tighten the bolts.
6. Reconnect Everything: Plug the wiring harnesses back into the new PCM until they click securely in place. Reconnect the negative battery terminal.
7. Perform Security Relearn (If Needed): In many cases, you will need to perform a simple security relearn procedure. This usually 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 trucks and SUVs. Please verify your vehicle is on this list. It is compatible with multiple original part numbers, including: 12569773, 12588650, 12589311, 12589585, 12591647, 12591648, 12593531, 12593532, 12594430, 12594431, 12596783, 12596784, 12597521, 12597776, 12597777, 12600818, 12604438, 12604439, and more.

• Chevrolet Colorado 2004-2006 (RH firewall)
• GMC Canyon 2004-2006 (RH firewall)
• Hummer H3 2006 (RH firewall)
• Isuzu I-280 / I-350 2006 (RH firewall)
• Buick Rainier 2006 (4.2L, LH engine)
• Chevrolet Trailblazer / EXT 2006 (4.2L, LH engine)
• GMC Envoy / XL 2006 (4.2L, LH engine)
• Isuzu Ascender 2006 (4.2L, LH engine)
• Saab 9-7X 2006 (6 cylinder, LH engine)

Frequently Asked Questions