Restore Your Ride’s Heartbeat and Your Peace of Mind
Is your 2006 Buick Rainier running rough, hesitating, or refusing to start? A nagging check engine light and unpredictable performance can turn every drive into a stressful guessing game. The Powertrain Control Module (PCM) is the brain of your vehicle, and when it falters, the symptoms can be frustrating and widespread. This isn’t just a part; it’s the solution to regaining the smooth, reliable performance you depend on. We provide a direct-fit, expertly programmed 2006 Rainier Powertrain Control Module, flashed with the latest GM software updates specifically for your vehicle’s VIN. This eliminates the need for an expensive trip to the dealership and puts the power of a confident repair back in your hands.
Warning Signs and How to Overcome Them
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, this module is the definitive solution to restore your vehicle’s health:
- ✔ Unexplained Check Engine Light with codes related to PCM failure (e.g., P0601, P0606) or communication errors.
- ✔ Rough or erratic engine idling and stalling.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ A noticeable drop in fuel economy.
- ✔ Complete no-start condition where the engine cranks but won’t fire up.
- ✔ Intermittent electrical issues or warning lights on the dash.
A Mechanic’s Note on the Final Step
“I’ve seen countless DIYers install a new PCM and get frustrated when the vehicle won’t start. They think the part is bad, but they’ve missed the crucial, final step: the Security Relearn procedure. On these GM platforms, the PCM needs to shake hands with the anti-theft system. It’s a simple key-on, key-off sequence that takes about 30 minutes. Don’t skip it! This final step is what syncs everything together and gives you that satisfying, clean first start after the repair.”
Guided Installation to Restore Your Confidence
You don’t need to be a master mechanic to complete this job. With our pre-programmed module, the most complex part is already done. Follow these steps for a successful installation:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- Locate the Old Module: On your 2006 Rainier, the PCM is typically found on the driver’s side of the engine compartment. It’s a metal box with several large electrical connectors.
- Perform the Swap: Carefully unplug the wiring harnesses. They have locking tabs, so be gentle. Unbolt the old module from its bracket and set it aside. Mount your new module in its place.
- Reconnect Everything: Securely plug the wiring harnesses into the new PCM. You should hear a click as they lock in. Reconnect the negative battery terminal.
- Perform Security Relearn: This is a critical step. Turn the key to the ‘ON’ position (don’t start the engine) for 10-15 minutes, or until the security light on the dash stops flashing. Turn the key off for 10 seconds. Repeat this cycle two more times. On the fourth attempt, the vehicle should start and run normally.
Guaranteed Compatibility for Your 2006 Rainier Powertrain Control Module
This module is a direct replacement for part number 12594430 and is guaranteed to fit the following vehicles and configurations. Please verify your vehicle is on this list before ordering:
- BUICK RAINIER 2006: Electronic Control Module; (LH engine), 4.2L
- CHEVROLET COLORADO 2004-2006: Electronic Control Module; (RH firewall)
- CHEVROLET TRAILBLAZER & TRAILBLAZER EXT 2006: Electronic Control Module; (LH engine), 4.2L
- GMC CANYON 2004-2006: Electronic Control Module; (RH firewall)
- GMC ENVOY & ENVOY XL 2006: Electronic Control Module; 4.2L (LH engine)
- HUMMER H3 2006: Electronic Control Module; (RH firewall)
- ISUZU ASCENDER 2006: Electronic Control Module; 4.2L (LH engine)
- ISUZU I-280 2006: Electronic Control Module; (RH firewall)
- ISUZU I-350 2006: Electronic Control Module; (RH firewall)
- SAAB 9-7X 2006: Electronic Control Module; (LH engine), 6 cylinder, ID 12569773 or 12597521
This computer also fits part numbers: 12569773, 12588650, 12589311, 12589585, 12591647, 12591648, 12593531, 12593532, 12594431, 12596783, 12596784, 12597521, 12597776, 12597777, 12600818, 12604438, 12604439, 12606369, 12606373, 12606374, 12606398, 12606399, 19209820, 19209821.
Frequently Asked Questions
What does ‘VIN Programmed’ mean for me?
It means we load your vehicle’s specific Vehicle Identification Number (VIN) and the latest factory software onto the module before we ship it. This ensures it communicates perfectly with your vehicle’s other systems, just like the original, saving you from a costly programming service at a dealership.
Is this part truly ‘plug and play’?
It’s very close. Because we handle the programming, the most difficult step is done. However, you will need to perform a simple ‘Security Relearn’ procedure after installation, which involves a few key cycles. This syncs the new module with your vehicle’s anti-theft system and is essential for the engine to start.
Where is the PCM located on my 2006 Rainier?
The Powertrain Control Module is located in the engine bay, on the driver’s side (LH side), mounted near the firewall or inner fender.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both engine and transmission functions. If the module is failing, it can send incorrect signals to the transmission, causing harsh or erratic shifts. Replacing a faulty PCM often resolves these related issues.
Do I need to send my old module back?
No core charge or return is required for this part. You can recycle your old module locally at your convenience.