Restore Peak Performance to Your GM Truck or SUV
Is your 2003-2006 GMC Yukon, or another compatible GM vehicle, suffering from frustrating issues like a persistent check engine light, erratic shifting, or a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the computer that serves as your vehicle’s brain. A faulty PCM can disrupt everything from fuel delivery to transmission control, making your truck unreliable. This replacement PCM, part number 89017750, is the definitive solution to get your vehicle running smoothly and dependably again.
We take the guesswork and extra cost out of the repair. Unlike a generic module from a parts store, this PCM arrives at your door pre-programmed with the latest GM factory software updates, specifically matched to your vehicle’s VIN. This means you can skip the expensive trip to the dealership for programming. It’s a direct-fit, ready-to-install solution for both professional technicians and savvy DIYers looking to perform a reliable repair.
From the Diagnostic Bay
I remember a 2005 Sierra 2500 that came into the shop with an intermittent no-start that was driving the owner crazy. It would be fine for weeks, then leave him stranded. Other shops had replaced the battery and starter to no avail. We checked all the basics—power and ground to the PCM were solid. But when we hooked up our scope, we saw the 5-volt reference signal dropping out intermittently. 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 has been starting reliably ever since. It’s a great example of how a failing PCM can create ghost-like problems that a simple replacement solves for good.
Is Your Truck Showing These PCM Failure Symptoms?
A failing computer can cause a wide range of problems. If you’re experiencing any of the following, a faulty PCM is a likely culprit. This 2003-2006 Yukon PCM is designed to resolve these common issues.
- ✔ Check Engine Light is on with codes like P0601 (Internal Memory Error) or P0606 (Processor Fault).
- ✔ Vehicle refuses to start or is very difficult to start.
- ✔ Poor or erratic automatic transmission shifting.
- ✔ A noticeable drop in fuel economy.
- ✔ Engine stalling, stumbling, or running rough for no apparent reason.
- ✔ Communication errors with other modules on the vehicle network (U-codes).
- ✔ Failure to pass a state emissions inspection.
A Straightforward Guide to Installation
Installing your new 2003-2006 Yukon PCM is a manageable job for someone with basic mechanical skills. The most common location is in the engine bay on the driver’s side, near the battery or air filter box. Always consult a repair manual for your specific vehicle’s procedure.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: Find the existing module in the engine bay. It will have several large wiring harness connectors.
- Disconnect Harnesses: Carefully release the locking tabs and disconnect all electrical connectors from the old PCM. Avoid forcing them.
- Remove Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install New Module: Mount the new PCM onto the bracket and securely reconnect all wiring harnesses. Ensure they click into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn: You will need to perform a security relearn procedure (often called a Passlock or Passkey relearn) to sync the new PCM with your vehicle’s anti-theft system. This procedure typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. This allows the vehicle to recognize the new module.
Verified Fitment For These GM Models
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 the list below. Note that for some 2004 models, matching the ID number 12602802 is important.
Fits various models of: Cadillac Escalade (2003-06), Chevrolet Avalanche (2003-06), Chevrolet Silverado (2003-07 Classic), Chevrolet Suburban (2003-06), Chevrolet Tahoe (2003-06), GMC Sierra (2003-07 Classic), GMC Yukon (2003-06), Hummer H2 (2003-07), and others. Please check the detailed fitment list to confirm compatibility with your exact year, model, and engine.
Frequently Asked Questions
Does this PCM come ready to install?
Yes. We program the module with the latest GM software using the VIN you provide during checkout. This makes it a plug-and-play part, though you will need to perform a standard security relearn procedure after installation.
What is a security relearn and is it difficult?
A security relearn syncs the new PCM to your vehicle’s anti-theft system. It’s a simple procedure that does not require special tools. Typically, you just cycle the ignition key on and off in a specific 30-minute sequence. We include instructions to guide you.
Where is the PCM located on my 2005 Yukon?
On most GMT800 platform trucks and SUVs like your Yukon, the PCM is located in the engine compartment on the driver’s side, typically mounted to a bracket near the battery and under-hood fuse block.
How do I provide my VIN number?
After you complete your purchase, you will receive an email with instructions on how to reply with your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls transmission line pressure and shift points. If the PCM is failing, it can cause harsh shifting, delayed engagement, or hunting for gears. Replacing a faulty PCM often resolves these issues.
Is this a new or used part?
This is a high-quality, tested, and guaranteed functional replacement part, programmed with vehicle-specific software to ensure proper operation.