Is your Cadillac Escalade, GMC Sierra, or Chevy Silverado suffering from perplexing engine issues? A faulty Powertrain Control Module (PCM) is often the culprit behind problems like a persistent check engine light, poor fuel economy, erratic shifting, or even a no-start condition. This module, part number 89017750, is the central computer for your vehicle’s engine and transmission, and when it fails, it can cause a cascade of frustrating symptoms. Restore your vehicle’s performance and reliability with this direct-fit replacement PCM, professionally programmed to your specific vehicle.
The Brain of Your Operation: Why the PCM is Critical
The PCM is arguably one of the most important components in your modern GM truck or SUV. It constantly analyzes data from dozens of sensors throughout the engine and drivetrain. Based on this information, it makes instantaneous adjustments to the fuel injection, ignition timing, transmission shift points, and emissions systems. A healthy PCM ensures your engine runs efficiently, powerfully, and cleanly. When internal circuits or software become corrupted, the entire operation is compromised, leading to the symptoms you may be experiencing.
From the Diagnostic Bay
We once had a 2005 Silverado 2500 come into the shop with an intermittent stalling issue that no one could figure out. The owner had already replaced the crank sensor, cam sensor, and even the fuel pump based on various theories. After hooking up our professional scan tool and monitoring live data, we noticed the 5-volt reference signal to several key sensors was dropping out randomly. This pointed directly to an internal failure in the PCM. We installed a VIN-programmed module just like this one, performed the security relearn, and the truck ran perfectly. It’s a classic case of how a failing computer can mimic the symptoms of multiple other parts, making correct diagnosis essential.
Common Symptoms of a Failing 2003-2006 Escalade EXT PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling or cutting out unexpectedly.
- ✔ No-start or hard-starting conditions.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Misfires or rough idling that can’t be traced to plugs or coils.
- ✔ Failure to pass state emissions testing.
Plug-and-Play Solution with VIN Programming
Don’t settle for a generic, unprogrammed module from a salvage yard that will require expensive dealer tools to configure. We take the guesswork out of the repair. When you purchase this PCM, simply provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians will then flash the module with the latest, most stable GM-certified software specific to your truck’s exact build. This ensures all systems communicate correctly and that your engine operates according to factory specifications. This service makes the installation process as simple as possible for you or your mechanic.
This module is a direct replacement for service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. Please verify your part number and consult the extensive fitment list to confirm compatibility with your specific year, make, and model.
Frequently Asked Questions
Is this PCM ready to install when I receive it?
Yes! This PCM comes pre-programmed to your vehicle’s VIN. In most cases, you will only need to perform a simple security relearn procedure (also known as a CASE learn or anti-theft relearn), which can typically be done without special tools. Instructions are widely available online for this 10-30 minute process.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your 17-digit VIN. We cannot ship your part until we receive this information, as the programming is essential for the part to function in your vehicle.
Where is the PCM located on my vehicle?
On most compatible GM trucks and SUVs like the Escalade, Silverado, and Tahoe, the PCM is located in the engine bay on the driver’s side, under or next to the battery tray. It is a silver metal box with multiple large electrical connectors.
Will this fix my check engine light?
If the check engine light and associated codes are being caused by a faulty PCM, then this replacement part will solve the issue. It is crucial to properly diagnose the vehicle first to ensure the PCM is the root cause of the problem and not a faulty sensor or wiring issue.
What if my original part number isn’t on the list?
The provided list of compatible service numbers (89017750, 12582605, etc.) covers the most common interchanges for this hardware type. If your number is different, please contact us with your VIN and original part number to verify compatibility before ordering.