Is Your Yukon XL Running Rough or Not Starting?
If your 2005-2006 GMC Yukon XL 2500 is suffering from perplexing issues like a persistent check engine light, poor fuel economy, erratic shifting, or even a no-start condition, the culprit is often the Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM controls everything from fuel injection and spark timing to transmission shift points. When it fails, it can cause a cascade of problems that are difficult to diagnose.
From the Diagnostic Bay
We had a 2006 Silverado 2500 with the 8.1L engine—the same platform as your Yukon—come into the shop with an intermittent stalling problem that was driving the owner crazy. He’d already replaced the fuel pump and a couple of sensors. After hooking up our scanner, we noticed the data stream from the PCM would just drop out randomly. We swapped in a pre-programmed module just like this one, and the truck ran perfectly. It’s often the last part people suspect, but a failing computer can mimic a dozen other mechanical issues.
Symptoms of a Failing Powertrain Control Module
- ✔ Persistent Check Engine Light (CEL) with communication error codes (U-codes).
- ✔ Engine misfires, stumbling, or stalling, especially when warm.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ The vehicle cranks but refuses to start.
- ✔ Failure to pass state emissions testing.
- ✔ Other seemingly unrelated electrical issues.
The Direct-Fit, Pre-Programmed Solution
This isn’t just a replacement part; it’s a complete solution. This Powertrain Control Module, compatible with part numbers 89017749, 12589462, and 12602801, arrives at your door ready for installation. The biggest challenge with replacing a modern vehicle computer is the need for expensive, dealer-level programming. We eliminate that step entirely. Using the Vehicle Identification Number (VIN) you provide at checkout, we flash the module with the latest, most stable GM-certified software specific to your vehicle’s configuration. This ensures perfect compatibility and optimal performance right out of the box.
Installing Your 2005-2006 Yukon XL PCM
Installation is straightforward for a DIY mechanic. On most GM trucks and SUVs of this era, including your Yukon XL 2500, the PCM is located in the engine bay on the driver’s side, often under or near the battery tray. The process generally involves disconnecting the vehicle’s battery, carefully unplugging the electrical connectors from the old module, unbolting it from its bracket, and then installing the new module in the reverse order. Once the new PCM is installed and the battery is reconnected, you will need to perform a security relearn procedure, which can typically be done without special tools by cycling the ignition key. In some cases, a Crankshaft Variation (CASE) relearn may be needed to prevent a P1336 code, which can be performed by most professional scan tools.
This module is a direct replacement for a wide range of GM vehicles, including the Chevrolet Silverado, GMC Sierra, Express and Savana vans, and more. Restore the reliability and performance of your truck with a properly functioning and correctly programmed engine computer.
Frequently Asked Questions
Do I need to have this PCM programmed by a dealer?
No. We handle all the programming for you before we ship the part. Simply provide us with your vehicle’s 17-digit VIN during checkout, and it will arrive ready to install.
What is a VIN and where do I find it?
The VIN is your vehicle’s unique 17-digit identification number. You can find it on your vehicle’s registration, insurance card, or on a small plate on the driver’s side of the dashboard, visible through the windshield.
Where is the PCM located on my 2005 Yukon XL 2500?
The PCM is typically located in the engine compartment on the driver’s side, mounted to a bracket under the battery tray.
Is this part difficult to install?
For someone with basic mechanical skills, the physical installation is straightforward. It involves disconnecting the battery and swapping the module. A security relearn procedure is required afterward, which can be done at home.
Will this fix my check engine light?
If the check engine light and other symptoms are being caused by a faulty PCM, this part is the correct solution. It’s crucial to ensure the vehicle’s issues have been properly diagnosed before ordering.