Is Your 2004-2006 Colorado or Canyon Running Rough?
If you’re dealing with a frustrating no-start condition, erratic engine behavior, or a check engine light that just won’t go away, there’s a strong chance the brain of your truck’s engine management systemโthe Powertrain Control Module (PCM)โhas failed. Over my 20+ years turning wrenches, I’ve seen this exact issue hundreds of times on these otherwise tough GM trucks. The constant heat cycles and vibration from its location on the firewall can wreak havoc on the delicate internal circuits over time.
You might be experiencing one or more of these classic symptoms of a bad PCM:
- โ Engine cranks but refuses to start.
- โ Stalling unexpectedly while driving or at idle.
- โ Harsh or erratic automatic transmission shifting.
- โ A persistent Check Engine Light (CEL) with communication-related codes (U-codes).
- โ Your scan tool can’t communicate with the engine computer at all.
- โ Poor fuel economy and a noticeable loss of power.
From the Shop Floor: A Real-World Scenario
“A customer’s 2005 Colorado came in last week with these exact symptoms. It would stall randomly at red lights and the transmission felt like it was shifting with a sledgehammer. He’d already replaced a few sensors trying to chase the problem. When I hooked up my professional scan tool, I got a ‘No Communication with ECM/PCM’ error. That’s a dead giveaway. After confirming power and ground at the module’s connector were good, we knew the PCM itself was the culprit. We installed one of our pre-programmed units, performed the quick security relearn, and the truck ran like it just rolled off the assembly line. It’s a common failure, but thankfully, it’s a straightforward fix with the right part.”
The Direct Solution: A VIN-Programmed PCM
This isn’t just a generic, off-the-shelf computer. This is a Powertrain Control Module that we professionally program specifically for YOUR vehicle using your VIN. This critical step ensures that the module has the correct software and calibrations for your truck’s specific engine, transmission, and emissions equipment. We load the latest GM-approved software updates, which often correct factory bugs and improve performance and longevity.
By ordering this module, you get:
- โ A PCM programmed to your exact vehicle VIN.
- โ The newest, most stable software from General Motors.
- โ A direct-fit replacement, making installation simple.
- โ A cost-effective solution that eliminates the need for a trip to the dealership for expensive programming.
Installation and Compatibility
This PCM is a direct replacement for part number 19209820 and the other part numbers listed below. On the Colorado, Canyon, and Hummer H3, you’ll find it mounted on the right-hand (passenger side) of the firewall in the engine bay. While installation is straightforward, please note that after installation, you will likely need to perform a simple security relearn procedure (often called a Passlock relearn). This procedure syncs the new PCM with your vehicle’s anti-theft system and can typically be done in your driveway without any special tools. Instructions are widely available online or in service manuals.
Guaranteed Fitment for Your Vehicle
This module is the correct replacement for a wide range of GM vehicles. Please confirm your vehicle is on this list and that your original part number is a match.
- โ Chevrolet Colorado (2004-2006) – Electronic Control Module; (RH firewall)
- โ GMC Canyon (2004-2006) – Electronic Control Module; (RH firewall)
- โ Hummer H3 (2006) – Electronic Control Module; (RH firewall)
- โ Isuzu I-280 (2006) – Electronic Control Module; (RH firewall)
- โ Isuzu I-350 (2006) – Electronic Control Module; (RH firewall)
- โ Buick Rainier (2006) – 4.2L, Electronic Control Module; (LH engine)
- โ Chevrolet Trailblazer (2006) – 4.2L, Electronic Control Module; (LH engine)
- โ GMC Envoy (2006) – 4.2L, Electronic Control Module; (LH engine)
- โ Isuzu Ascender (2006) – 4.2L, Electronic Control Module; (LH engine)
- โ Saab 9-7X (2006) – 6 cylinder, Electronic Control Module; (LH engine)
This module replaces the following 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