Restore Peak Performance to Your Cadillac Escalade ESV
Is your 2003-2006 Escalade ESV suffering from frustrating issues like a persistent check engine light, poor fuel economy, erratic shifting, or even a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the central computer of your vehicle. A faulty PCM can disrupt everything from engine timing to transmission function, making your luxury SUV feel unreliable. This replacement PCM, part number 89017750, is the definitive solution to restore your vehicle’s performance and dependability.
Forget the expensive trip to the dealership and the hassle of coordinating programming. We handle the critical first step for you. Before shipping, we flash this module with the latest official GM software updates, tailored specifically to your vehicle using the VIN you provide. This ensures that all factory parameters for your engine and transmission are perfectly calibrated, correcting common software bugs and improving overall operation. This is the most reliable way to get your truck back to factory-spec condition.
From the Diagnostic Bay: The Intermittent Stall Mystery
I remember a 2005 Yukon XL coming into my shop with a problem that was driving the owner crazy. It would run perfectly for days, then suddenly stall at a stoplight and refuse to restart for 10-15 minutes. There were no consistent trouble codes, just a history of random communication errors (U-codes). We checked fuel pressure, ignition components, and wiring harnesses—all were fine. On a hunch, I monitored the PCM’s internal temperature data. Sure enough, after a long drive, the temperature readings would spike just before it stalled. The internal processor was failing under heat soak. Replacing the PCM with a properly programmed unit like this one solved the problem permanently. These intermittent issues are often the hardest to diagnose and are frequently caused by a failing module.
Is Your GM Truck or SUV Showing These Symptoms?
- ✔ Unexplained Check Engine Light (CEL) illumination.
- ✔ Stored diagnostic trouble codes (DTCs) like P0601, P0602, P0606, or U0100.
- ✔ The engine cranks but refuses to start.
- ✔ Rough idling, stalling, or hesitation during acceleration.
- ✔ Noticeable decrease in fuel mileage.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass state emissions testing.
Your Straightforward Installation Guide
Installing your new 2003-2006 Escalade ESV PCM is a manageable job for a confident DIYer. After installation, a simple security relearn procedure is required to sync the new module with your vehicle’s anti-theft system. No special scan tools are needed for this process.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most compatible models, the PCM is located in the engine bay, on the driver’s side, under or next to the battery tray.
- Disconnect Connectors: Carefully release the locking tabs and unplug the wiring harness connectors from the old PCM. Avoid forcing them.
- Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Mount your new, pre-programmed PCM and securely reconnect the wiring harnesses. Ensure they click into place.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn (Crucial Step):
- Turn the key to the “ON” position (do not start the engine).
- Attempt to start the engine. It will crank but not start. The security light may be on or flashing.
- Leave the key in the “ON” position for 10-12 minutes, until the security light turns off or stops flashing.
- Turn the key to “OFF” for 10 seconds.
- Repeat this cycle two more times for a total of three 10-minute cycles.
- After the third cycle, the vehicle should 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. Please verify your vehicle is on this list. Note that for some 2004 models, matching the ID number 12602802 is important.
(This is a summary. Please consult the detailed fitment list or contact us with your VIN to confirm.)
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential. It allows us to access the correct GM database and program the PCM with the precise software and calibrations for your Escalade’s specific engine, transmission, and factory options. This ensures seamless integration and optimal performance.
Is this module difficult to install?
The physical installation is straightforward, typically involving a few bolts and electrical connectors. The most important part is performing the security relearn procedure afterward, which requires no special tools and just a bit of patience. Our included instructions walk you through it step-by-step.
Will this fix my check engine light?
If the check engine light is caused by an internal PCM failure (like codes P0601 or P0606), this part is the correct fix. However, a check engine light can be triggered by many other components. It’s always best to have the codes read by a scanner to properly diagnose the root cause before ordering.
Is this a new or used part?
This is a high-quality, tested, and verified used OEM part. Each module undergoes a rigorous inspection and is then programmed with fresh, updated GM software to ensure it performs to factory standards. This provides dealership-level reliability at a fraction of the cost.
Do I need to do anything else after installation?
After the physical installation and the security relearn, you may need to perform a Case Relearn (Crankshaft Position System Variation Learning) with a capable scan tool for maximum smoothness, but the vehicle will run and drive without it. Most customers find the vehicle runs perfectly after just the security relearn.