End the Frustration of a Faulty Engine Computer
Is your 2006 Trailblazer running rough, throwing confusing check engine codes, or struggling with inconsistent performance? A failing Powertrain Control Module (PCM) is often the hidden culprit behind these maddening issues. It’s the brain of your vehicle, and when it’s not functioning correctly, nothing else will. This isn’t just an inconvenience; it’s a matter of reliability and safety. Stop guessing with generic parts and get the definitive, hassle-free solution. This PCM is professionally programmed with the latest GM updates specifically for your vehicle’s VIN, ensuring a perfect match and restoring the smooth, dependable performance you remember.
Warning Signs and How to Overcome Them
If you’re experiencing any of the following, a failing PCM could be the cause. Replacing it with this correctly programmed unit can resolve these issues and bring back the confidence of a healthy vehicle:
- ✔ Check Engine Light (CEL) illuminated with codes like P0601, P0602, P0606, or other communication errors.
- ✔ Unexplained drops in fuel economy, costing you money at the pump.
- ✔ Rough or erratic idling and stalling that makes driving stressful.
- ✔ Harsh or delayed transmission shifting.
- ✔ The vehicle fails to start, or starts intermittently.
- ✔ Communication issues with diagnostic scan tools.
Guided Installation to Restore Peace of Mind
You don’t need to be a master mechanic to complete this repair. With basic tools and a little patience, you can install your new PCM and get back on the road. Follow these simple steps for a successful installation:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to allow the system to fully discharge.
- Locate the Module: On your 2006 Trailblazer, the PCM is typically located on the driver’s side of the engine compartment, mounted to the inner fender or firewall.
- Disconnect the Harnesses: Carefully release the locking tabs on the electrical connectors and gently pull them straight out from the module. Never force them. Inspect the connectors for any corrosion or damaged pins.
- Remove the Old PCM: Unbolt the mounting hardware that secures the old PCM to its bracket and remove it from the vehicle.
- Install the New Unit: Mount your new, pre-programmed PCM in the same location and secure it with the original hardware.
- Reconnect and Finalize: Firmly plug the electrical harnesses back into the new module until they click into place. Reconnect your battery’s negative terminal.
- Perform Security Relearn: In many cases, a simple security relearn procedure is required. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times before starting the engine. This allows your vehicle’s anti-theft system to recognize the new computer.
Tailored Fit for Your Ride
This module is a direct-fit replacement, programmed to work seamlessly with the following vehicles. Please verify your part number (12597777) or one of the interchangeable numbers listed below.
- Buick Rainier: 2006 (4.2L)
- Chevrolet Colorado: 2004-2006
- Chevrolet Trailblazer: 2006 (4.2L)
- Chevrolet Trailblazer EXT: 2006 (4.2L)
- GMC Canyon: 2004-2006
- GMC Envoy: 2006 (4.2L)
- GMC Envoy XL: 2006 (4.2L)
- Hummer H3: 2006
- Isuzu Ascender: 2006 (4.2L)
- Isuzu i-280: 2006
- Isuzu i-350: 2006
- Saab 9-7x: 2006 (6 cylinder)
This unit replaces 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.
Your Questions, Answered
Frequently Asked Questions
Do I need to do anything after I buy it?
Yes. After your purchase, you must provide us with your vehicle’s 17-digit VIN (Vehicle Identification Number). We use this to load the precise factory software and updates for your specific vehicle, ensuring a perfect plug-and-play installation.
Is this a simple plug-and-play installation?
Absolutely. Because we program the module to your VIN before shipping, it is ready to install right out of the box. In most cases, you will only need to perform a simple security relearn procedure, which takes about 30 minutes and requires no special tools.
Will this fix my check engine light?
If the check engine light and performance issues are caused by a faulty PCM (common codes include P0601-P0606), then this part is the correct solution. It’s crucial to ensure your vehicle’s other components (sensors, wiring) are in good working order for a complete repair.
Where do I find my VIN?
Your VIN can be found on a metal plate on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
What if I have a different part number?
This module replaces a wide range of part numbers. Please check the comprehensive list in the description. If your part number is on that list, this module will work perfectly for your vehicle once programmed.