Is Your 2004-2006 GMC Canyon or Chevy Colorado Running Rough?
The Powertrain Control Module, or PCM, is the central brain of your truck’s engine and transmission. It controls everything from fuel injection and ignition timing to transmission shift points and emissions systems. When it begins to fail, it can cause a wide range of frustrating and often difficult-to-diagnose problems. If you’re dealing with a persistent check engine light, poor performance, or intermittent stalling, a faulty PCM could be the culprit. This replacement module is the definitive solution to restore your vehicle’s original performance and reliability.
From the Diagnostic Bay
We had a 2005 Colorado in the shop that was driving the owner crazy. It would randomly stall at stoplights, but never threw a consistent trouble code. We checked the fuel pump, sensors, and wiring, but everything seemed fine. On a hunch, we monitored the live data from the PCM and noticed the injector pulse width would erratically drop to zero just before a stall. We swapped in a known-good, correctly programmed PCM, and the problem vanished instantly. It’s a perfect example of how a failing module can create ghost-like issues that standard diagnostics miss, making a quality, pre-programmed replacement essential.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) that won’t clear or returns immediately.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A complete no-start condition where the engine cranks but won’t fire up.
- ✔ Noticeable decrease in fuel economy.
- ✔ Failure to pass state emissions testing.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Other warning lights on the dash, like ABS or traction control, may illuminate.
The Plug-and-Play Solution: A Pre-Programmed 2004-2006 Canyon PCM
Don’t waste time and money at the dealership. This Powertrain Control Module arrives at your door fully programmed to your truck’s specific Vehicle Identification Number (VIN). We install the latest GM-certified software updates, which can resolve factory bugs and improve overall vehicle operation. This VIN-matching process ensures that the module communicates perfectly with all the other systems in your vehicle, making installation straightforward. Once installed, you may need a simple security relearn or CASE relearn procedure, which can often be done without special tools.
Guaranteed Fitment
This module is a direct replacement for a wide range of GM light trucks and SUVs. It is compatible with 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, and 19209821. It will fit the following vehicles:
- 2004-2006 GMC Canyon (RH firewall)
- 2004-2006 Chevrolet Colorado (RH firewall)
- 2006 Hummer H3 (RH firewall)
- 2006 Isuzu I-280 (RH firewall)
- 2006 Isuzu I-350 (RH firewall)
- 2006 Buick Rainier 4.2L (LH engine)
- 2006 Chevrolet Trailblazer & Trailblazer EXT 4.2L (LH engine)
- 2006 GMC Envoy & Envoy XL 4.2L (LH engine)
- 2006 Isuzu Ascender 4.2L (LH engine)
- 2006 Saab 9-7X 4.2L 6-cylinder (LH engine)
Frequently Asked Questions
Do I need to program this module?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during or after checkout, and we will flash the module with the latest GM software specific to your truck.
Where is the PCM located on my 2004-2006 Canyon or Colorado?
The PCM, also called the Electronic Control Module (ECM), is typically located in the engine bay on the right-hand (passenger side) firewall.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM, then yes, this part will resolve the issue. It’s crucial to properly diagnose the vehicle first to ensure the fault codes are not being caused by a bad sensor or wiring problem elsewhere.
What is a CASE relearn and will I need to do it?
A CASE (Crankshaft Angle Sensor Error) relearn synchronizes the new PCM with your engine’s crankshaft position sensor. After installing the new module, this procedure is often required to prevent a P1336 trouble code. Many mid-range scan tools have this function, or a local repair shop can perform it for you quickly.
Is this a simple plug-and-play installation?
Yes, for the most part. The physical installation involves disconnecting the battery, unplugging the electrical connectors, and unbolting the old module. After installing the new one, you will need to perform a security relearn procedure (often called a Passlock relearn) which involves a sequence of key cycles. Instructions are readily available online for this process.