Restore Peak Performance to Your GM Truck or SUV
Is your 2004 GMC Yukon XL 1500, or another compatible GM vehicle, suffering from perplexing engine issues? A faulty Powertrain Control Module (PCM) is often the culprit behind problems like a persistent Check Engine Light, rough idling, stalling, or even a no-start condition. As the central computer for your engine and transmission, its proper function is critical. This replacement PCM, service number 12586242, is the definitive solution to get your vehicle running reliably again.
From the Diagnostic Bay
We had a 2004 Sierra 1500 come into the shop that was driving the owner crazy. It would randomly stall at stoplights and had a laundry list of intermittent communication codes (U-codes). The owner had already replaced the throttle body and a couple of sensors with no luck. After hooking up our scope, we noticed the 5-volt reference signal from the PCM was dropping out unpredictably. Instead of just selling him a new module, we swapped in a known-good test unit programmed to his VIN. The truck ran perfectly for two days. This confirmed the internal failure of the original computer. This is a classic case where shotgunning parts costs more than correctly diagnosing a faulty PCM. Getting a correctly programmed module is the key to a lasting repair.
The Heart of Your Vehicle’s Operation
The PCM is more than just a simple component; it’s the brain that orchestrates everything from fuel injection and spark timing to transmission shift points and emissions controls. When it fails, the symptoms can be widespread and confusing. Heat cycles, vibration, and electrical shorts over many years can degrade internal components, leading to the issues you’re facing. Our replacement modules are meticulously inspected to ensure they meet or exceed original equipment standards, providing a dependable and lasting solution.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is on with various trouble codes
- ✔ Engine stalling or stumbling for no apparent reason
- ✔ Rough or erratic idle
- ✔ Noticeable decrease in fuel economy
- ✔ Harsh or incorrect automatic transmission shifting
- ✔ Vehicle fails to start intermittently or completely
- ✔ Communication errors with diagnostic scan tools
Plug-and-Play Solution with VIN Programming
Don’t waste time and money at the dealership. We simplify the repair process by programming this 2004 Yukon XL PCM with your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This crucial step loads the latest GM-certified software and calibrations for your exact make, model, and options. This ensures that once installed, the computer will communicate seamlessly with all other modules in your vehicle. In most cases, this allows for a straightforward installation, though some vehicles may require a simple security relearn procedure (often called a CASE relearn) which can be done without special tools.
This module is a direct replacement for part number 12586242 and is also compatible with the following service numbers: 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN. It fits a wide range of 2004 GM vehicles, including the GMC Sierra, Yukon, Envoy; Chevrolet Silverado, Tahoe, Suburban, Avalanche, Trailblazer, SSR; Cadillac Escalade; Hummer H2; Buick Rainier; and Isuzu Ascender. Please verify your original part number to ensure compatibility.
Frequently Asked Questions
Do I need to provide my VIN?
Yes. Providing your VIN is mandatory. We use it to program the module with the correct software and calibrations for your specific vehicle, ensuring proper function and a seamless installation.
Is this a simple plug-and-play installation?
For most vehicles, yes. Because we pre-program the unit, you can typically install it and start the vehicle. However, some GM vehicles require a security relearn procedure to sync the new PCM with your anti-theft system. This procedure is straightforward and can usually be done without any special tools.
Will this fix my check engine light?
If the Check Engine Light is caused by a faulty PCM, this part will resolve the issue. It’s essential to ensure that the underlying cause of the codes is not a separate faulty sensor or wiring issue. This module corrects problems originating from the computer itself.
Where is the PCM located on my 2004 Yukon?
On most GM trucks and full-size SUVs from this era, including the Yukon, Sierra, and Silverado, the PCM is located in the engine bay on the driver’s side, typically under the battery tray or near the fender well.
What if I have a different service number on my original part?
This module, 12586242, replaces several service numbers, including 19299226, 89017738, and various Y-series codes like YFKD and YFXL. As long as your original service number is on our compatibility list, this part will work for your vehicle.