Restore Peak Performance to Your GM Truck or SUV
Is your 2003-2006 Yukon XL 1500, Silverado, or Tahoe acting up? If you’re dealing with a persistent Check Engine light, erratic engine behavior, or frustrating no-start conditions, a failing Powertrain Control Module (PCM) is often the culprit. As the ‘brain’ of your vehicle, the PCM controls everything from fuel mixture and ignition timing to transmission shifts. When it falters, the symptoms can be confusing and costly to diagnose. This replacement PCM, part number 89017750, is the reliable, straightforward solution to get your truck back on the road and running like new.
We take the guesswork and dealer hassle out of the equation. Unlike a generic module from a parts store, this unit arrives at your door pre-programmed with the latest official GM software updates, specifically matched to your vehicle’s VIN. This critical step ensures all systems communicate correctly, restoring factory performance and fuel efficiency. Don’t let a faulty computer keep you sidelined. This is the direct-fit fix for your 2003-2006 Yukon XL PCM and a wide range of other GM vehicles.
A Technician’s Notebook
I remember a 2005 Silverado 2500 that came into my shop with an intermittent stalling issue that no one could pin down. It would run fine for days, then suddenly die at a stoplight. No consistent codes, just a random P0606 (PCM Processor Fault) that would appear and disappear. After checking all the usual suspects—fuel pump, crank sensor, wiring—we focused on the PCM. On these trucks, years of engine heat and vibration can cause microscopic cracks in the PCM’s circuit board. We swapped in a VIN-programmed module, and the problem vanished instantly. The customer went from being ready to sell the truck to having his reliable workhorse back.
Is Your Truck Showing These Telltale Signs?
- ✔ Unexplained Check Engine Light with codes like P0601, P0606, or U0100.
- ✔ Engine cranks but refuses to start.
- ✔ Rough idling, stalling, or hesitation during acceleration.
- ✔ Noticeably poor fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Other modules (like the ABS or BCM) setting communication error codes.
Plug-and-Play Installation: Get Back on the Road Fast
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery.
- ✔ Locate the PCM: On most of these GM trucks and SUVs, the PCM is located in the engine bay on the driver’s side, near the battery and under a plastic cover.
- ✔ Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old PCM. These connectors have locking levers; lift them to release.
- ✔ Remove the Old Module: Unbolt the PCM from its mounting bracket.
- ✔ Install the New Module: Bolt your new, pre-programmed PCM into place.
- ✔ Reconnect and Secure: Firmly plug the wiring harnesses into the new PCM until they click, and press the locking levers down. Reconnect the negative battery terminal.
- ✔ Perform Security Relearn: You may need to perform a simple security relearn procedure, which can typically be done with just the ignition key. This allows the vehicle’s anti-theft system to recognize the new PCM. Instructions are readily available online for your specific model.
Verified Vehicle Compatibility
This module, service number 89017750, is a direct replacement for several part numbers including 12582605, 12589463, 12602802, and more. It is guaranteed to fit a wide range of GM trucks and SUVs. Please verify your model and year from the list below. Some models require matching the ID number (e.g., ID 12602802).
Frequently Asked Questions
Do I need to do anything after I buy this?
Yes. After your purchase, you must provide us with your vehicle’s 17-digit VIN. We cannot ship your order until we have this information, as we use it to program the module specifically for your truck.
Is this a simple plug-and-play installation?
Mostly, yes. The module is a direct physical replacement. After installation, you will likely need to perform a security relearn procedure, which syncs the new PCM to your vehicle’s anti-theft system. This procedure typically takes 10-15 minutes and only requires the ignition key.
Will this fix my transmission shifting problems?
If the shifting issues are caused by faulty signals from the PCM, then yes, this will resolve them. The PCM controls transmission line pressure and shift points, so a new, correctly programmed module is essential for smooth operation.
What if I have a P0601 code?
The Diagnostic Trouble Code (DTC) P0601 stands for “Internal Control Module Memory Check Sum Error.” This is a fatal error for a PCM and almost always means the module itself has failed and must be replaced. This part is the correct solution for a P0601 code.
Where is the service number on my old PCM?
The service number (e.g., 89017750) is printed on the factory label on the top of your existing PCM. Matching this number ensures you are ordering the correct hardware family for your vehicle.