Programmed 2003-2006 Escalade ESV PCM 12589463 | Engine Computer ECM

Restore Peak Performance to Your GM Truck or SUV

Is your 2003-2006 Cadillac Escalade ESV, or another compatible GM vehicle, suffering from frustrating and unpredictable issues? Problems like intermittent stalling, a stubborn check engine light, poor fuel economy, or a complete no-start condition can often be traced back to a single component: a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, its health is critical for your vehicle’s reliability. This direct-fit PCM, part number 12589463, is the definitive solution to get your truck back to running the way it should.

We take the guesswork and high cost out of the repair. Unlike a blank module from a dealership that requires expensive specialty tools, this PCM arrives at your door fully programmed with the latest official GM software. All we need is your vehicle’s 17-digit VIN during checkout. This ensures perfect communication with your truck’s existing systems, restoring factory-spec engine performance, transmission shifting, and fuel efficiency right out of the box.

Is Your GM Truck Showing These Signs of a Bad PCM?

• ✔ Check Engine Light: Persistent illumination, especially with internal processor fault codes like P0601, P0602, or P0606.
• ✔ Engine Stalling or Misfiring: The engine may stall for no reason, run rough, or hesitate during acceleration.
• ✔ No-Start Condition: The engine cranks but will not start, often due to a lack of fuel injector or ignition coil command.
• ✔ Poor Fuel Economy: A faulty PCM can’t properly manage the air-fuel mixture, leading to wasted gas.
• ✔ Erratic Transmission Shifting: Harsh shifts, delayed engagement, or getting stuck in a gear can be caused by the PCM.
• ✔ Failed Emissions Test: Inability to pass smog due to incorrect engine management or readiness monitor issues.

A Straightforward Guide to Installation

1. ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
2. ✔ Locate the PCM: On most compatible trucks and SUVs (like the Escalade, Tahoe, and Silverado), the PCM is located in the engine bay on the driver’s side, often under or next to the battery tray.
3. ✔ Disconnect the Harnesses: Carefully lift the locking levers on the electrical connectors and pull them straight out from the module. There are typically two or three large connectors. Avoid forcing them.
4. ✔ Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s usually held in by a few 10mm bolts.
5. ✔ Install the New PCM: Mount your new, pre-programmed PCM and securely tighten the bolts.
6. ✔ Reconnect Everything: Plug the electrical harnesses back into the new PCM, ensuring the locking levers click firmly into place. Reconnect the negative battery terminal.
7. ✔ Perform Security Relearn (Crucial Step): You must perform a simple security relearn. Turn the key to the ‘ON’ position (without starting the engine) for 10-12 minutes. The ‘Security’ light on the dash should turn off. Turn the key off for 10 seconds, and then the vehicle will start and run normally.

Verified Vehicle Compatibility

This module is a direct replacement for service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. It fits a wide range of GM trucks and SUVs, including but not limited to:

• Cadillac Escalade, ESV, EXT (2003-2006)
• Chevrolet Avalanche 1500 (2003-2006)
• Chevrolet Silverado 1500, 2500, 3500 (2003-2007 Classic)
• Chevrolet Suburban 1500, 2500 (2003-2006)
• Chevrolet Tahoe (2003-2006)
• Chevrolet SSR (2003)
• GMC Envoy XL (2003)
• GMC Sierra 1500, 2500, 3500, Denali (2003-2007 Classic)
• GMC Yukon, Yukon XL 1500, Yukon XL 2500 (2003-2006)
• Hummer H2 (2003-2007)
• Isuzu Ascender (2003)
• Chevrolet Trailblazer EXT (2003)

Please verify your specific year, model, and engine options. If you are unsure, contact us with your VIN.