Programmed 2006 Rainier Powertrain Control Module PCM 12597521 | VIN Flashed

Restore Peak Performance to Your GM SUV or Truck

If you’re dealing with frustrating issues like a persistent check engine light, erratic engine behavior, harsh shifting, or even a no-start condition in your 2006 Buick Rainier, a failing Powertrain Control Module (PCM) is a very likely culprit. As the central computer for your engine and transmission, its health is critical. This isn’t just a replacement part; it’s a direct solution, delivered to your door programmed with the latest GM software updates specifically for your vehicle’s VIN. This eliminates the costly and time-consuming trip to a dealership for programming.

Over my 20+ years in automotive diagnostics, I’ve seen countless PCMs on the GMT360 platform (Trailblazer, Envoy, Rainier) fail due to their mounting location on the side of the 4.2L engine. Constant exposure to heat cycles and vibration eventually takes a toll on the sensitive internal circuits. This deterioration leads to the unpredictable problems you’re likely experiencing. Our service provides a reliable, pre-programmed 2006 Rainier Powertrain Control Module, allowing you to bypass the dealership and get your vehicle running smoothly again.

Is Your Vehicle Showing These Symptoms?

• ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
• ✔ The engine cranks but refuses to start.
• ✔ Unexplained stalling, especially after the engine has warmed up.
• ✔ Poor fuel economy and noticeable loss of power.
• ✔ Harsh or erratic automatic transmission shifting.
• ✔ Communication errors with diagnostic scan tools.

A Straightforward Guide to Installation

1. ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
2. ✔ Locate the PCM: On models with the 4.2L engine, the PCM is typically located on the driver’s side of the engine block. For other compatible models, it may be on the passenger-side firewall.
3. ✔ Disconnect Connectors: Carefully release the locking tabs and unplug the wiring harnesses from the old module. Inspect the connectors for any corrosion or damage.
4. ✔ Swap the Modules: Unbolt and remove the old PCM. Mount your new, pre-programmed module in its place and secure the bolts.
5. ✔ Reconnect and Secure: Plug the wiring harnesses firmly into the new PCM, ensuring the locking tabs click into place. Reconnect the negative battery terminal.
6. ✔ Perform Security Relearn: You will need to perform a simple key-cycle security relearn procedure. This typically 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.

Will This Fit My Vehicle?

This module is a direct-fit replacement for a wide range of GM vehicles and is guaranteed to be compatible if your original part number is listed. It fits the following models:

• Buick Rainier: 2006 (4.2L)
• Chevrolet Colorado: 2004-2006
• Chevrolet Trailblazer & Trailblazer EXT: 2006 (4.2L)
• GMC Canyon: 2004-2006
• GMC Envoy, Envoy XL: 2006 (4.2L)
• Hummer H3: 2006
• Isuzu Ascender: 2006 (4.2L)
• Isuzu i-280 & i-350: 2006
• Saab 9-7x: 2006 (6-cylinder)

This module 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.