Restore Your Truck’s Core Performance and Reliability
Is your 2005-2006 GMC Yukon XL 2500 running rough, stalling unexpectedly, or showing a persistent Check Engine Light? As the central computer for your engine and transmission, a failing Powertrain Control Module (PCM) can cause a host of frustrating and difficult-to-diagnose issues. I’ve seen it countless times in the shop: owners chase down sensor after sensor, only to find the root cause was the PCM itself. This module is the definitive solution, restoring factory performance and communication between all your vehicle’s critical systems.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the hassle and high cost out of the equation by programming this module specifically to your vehicle’s VIN. This ensures it has the latest GM software updates and communicates flawlessly with your Yukon’s specific options and components right out of the box. You get a reliable fix that eliminates the need for an expensive trip to the dealership for programming.
A Technician’s Notebook
I remember a 2006 Yukon XL 2500 with the big 8.1L V8 that came into my bay with a laundry list of complaints. The owner reported random stalling at stoplights, harsh transmission shifts, and a Check Engine Light that would come and go. His previous mechanic had replaced two O2 sensors and the MAF sensor with no luck. When I hooked up my scanner, I saw a P0606 (ECM/PCM Processor Fault) code stored, but it wasn’t active. These intermittent processor faults are a classic sign of a PCM failing internally, often when it gets hot. After confirming power and grounds to the module were solid, we installed a VIN-programmed PCM. The difference was immediate. The engine idled smoothly, shifts were crisp, and the ghost-like electrical problems vanished. It’s a perfect example of how replacing the core component saves time, money, and a lot of headaches.
Is Your Yukon Exhibiting These Symptoms?
A failing PCM can manifest in various ways. If you’re experiencing any of the following, this module is the likely solution.
- ✔ Persistent Check Engine Light (CEL)
- ✔ Engine stalling or sputtering for no apparent reason
- ✔ Noticeable decrease in fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Engine cranks but refuses to start
- ✔ Failed emissions test
- ✔ Diagnostic Trouble Codes (DTCs) pointing to internal module failure, such as P0601, P0602, or P0606
A Straightforward Guide to Installation
Installing your new 2005-2006 Yukon XL 2500 PCM is a manageable job for a DIYer with basic tools. The module is located in the engine bay on the driver’s side, under the battery tray.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- Access the Module: You will need to remove the battery and the battery tray to gain access to the PCM. Keep track of the hold-down bolts.
- Disconnect Connectors: Carefully unplug the electrical connectors from the old PCM. There are typically release tabs that need to be depressed or levers that need to be swung over. Do not force them.
- Remove Old PCM: Unbolt the old PCM from its mounting bracket.
- Install New PCM: Mount your new, pre-programmed PCM onto the bracket and securely plug in the electrical connectors. You should hear or feel a click as they lock into place.
- Reassemble: Reinstall the battery tray and the battery. Reconnect the negative battery terminal.
- Security Relearn Procedure: In most cases, you will need to perform a security relearn procedure to sync the new PCM with your vehicle’s anti-theft system. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. Your vehicle’s service manual will have the exact steps.
Verified Vehicle Compatibility
This Powertrain Control Module, part number 12602801, is a direct-fit replacement for a wide range of GM trucks, vans, and SUVs. It is also a direct replacement for part numbers 12589462 and 89017749. Please verify your vehicle is on the list below. Your VIN is required to ensure perfect programming for your specific application.
Chevrolet Avalanche 2500 (2005-2006): Electronic Control Module; (LH front under battery)
Chevrolet & GMC HD Pickups (2005-2007): Silverado/Sierra 2500 & 3500 with 8.1L gasoline engine. Includes ’07 Classic style (creased door skin). Location: LH front under battery.
Chevrolet & GMC 1500 Pickups (2005-2007): Silverado/Sierra 1500 with 4.3L engine, w/o hybrid. Includes ’07 Classic style. Location: LH front under battery.
Chevrolet & GMC Vans (2005-2007): Express/Savana 1500, 2500, 3500 (gasoline). Location: LH rear engine compartment.
GMC Safari / Chevrolet Astro (2005): Electronic Control Module; (LH front by battery)
Cadillac CTS-V (2004-2005): Electronic Control Module; (RH engine compartment), ID 12589462 or 12602801
Chevrolet Blazer S10 / GMC Jimmy S15 (2005): Electronic Control Module; (RH front engine compartment)
Chevrolet Suburban 2500 (2005-2006): Electronic Control Module; (LH front under battery), 8.1L
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the PCM with the exact software and calibrations for your specific engine, transmission, and factory options. This ensures a perfect, plug-and-play installation without needing a trip to the dealer.
Is this a simple plug-and-play installation?
Yes, for the most part. The module is pre-programmed for your vehicle. However, you will need to perform a security relearn procedure after installation. This is a simple process that pairs the new module to your key and can be done at home without special tools.
Will this fix my transmission shifting problems?
The PCM controls both engine and transmission functions. If your shifting issues are caused by faulty electronic commands from a failing PCM, then yes, this part will resolve them. It restores the correct communication and shift point commands.
What happens if I order without providing a VIN?
We cannot ship the module until we receive your VIN. The programming is a critical part of the service we provide to guarantee the part works correctly in your vehicle. We will contact you after your purchase to request the VIN.
Does this module come with a warranty?
Yes, all of our electronic modules are thoroughly tested and come with a warranty. Please see the warranty tab on the product page for specific terms and duration for your peace of mind.