Is Your 2004 GM Truck or SUV Running Rough?
There’s nothing more frustrating than a vehicle you can’t rely on. If your 2004 GMC Yukon, Chevy Silverado, Tahoe, or another compatible GM vehicle is experiencing perplexing issues like stalling, poor fuel mileage, or a persistent check engine light, the problem might be its electronic brain: the Powertrain Control Module (PCM). The PCM is the central command center for your engine and transmission, and when it fails, it can cause a cascade of performance problems that are difficult to diagnose.
From the Diagnostic Bay
We recently had a 2004 Silverado 1500 towed in that had its owner completely stumped. The truck would run fine for 20 minutes, then suddenly stall at a stoplight and refuse to restart for an hour. The owner had already replaced the fuel pump and crank sensor with no luck. After connecting our scan tool, we noticed erratic data from multiple sensors, but only when the engine was warm. This pointed us toward a thermally failing PCM. We installed a correctly programmed replacement module, and the truck ran perfectly. It’s a classic case where shotgunning parts costs more time and money than correctly identifying the root cause – a faulty engine computer.
Symptoms of a Failing 2004 Yukon PCM
A failing PCM can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following, your engine computer could be the culprit:
- ✔ Check Engine Light: The light is on, and you may have codes related to sensor circuits, module communication, or random misfires.
- ✔ Engine Stalling: Your vehicle may stall unexpectedly, either while driving or at idle, and may be difficult to restart.
- ✔ Poor Performance: Noticeable loss of power, hesitation during acceleration, and decreased fuel economy.
- ✔ Rough or Erratic Idle: The engine RPMs may fluctuate unpredictably when the vehicle is stopped.
- ✔ Harsh Shifting: The transmission may shift erratically, slam into gear, or fail to shift at all.
- ✔ No-Start Condition: The engine cranks but refuses to start, even with a good battery and fuel supply. This can be caused by the PCM failing to command spark or fuel injection.
- ✔ Communication Errors: Your mechanic’s scan tool may be unable to communicate with the PCM, a definitive sign of module failure.
The Direct-Fit, Programmed Solution
Don’t let a faulty computer keep your truck off the road. This Powertrain Control Module, service number 12586242, is the definitive solution for your vehicle. We take the guesswork and hassle out of the repair process. Unlike a generic module from a parts store or a salvage yard unit, this PCM comes professionally programmed specifically for your truck. We use your vehicle’s unique Vehicle Identification Number (VIN) to load the latest, most up-to-date GM factory software. This ensures perfect compatibility and optimal performance right out of the box.
This module is a direct replacement for a wide range of 2004 GM trucks and SUVs. It is compatible with the following service numbers, often found on the original module’s sticker:
12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, YHTN
Simply match one of these numbers to your original part to confirm compatibility. Our programming service means you can avoid a costly trip to the dealership for flashing. The process is simple: place your order, provide us with your VIN, and we’ll ship a module that is ready for installation.
Do I need to get this PCM programmed?
No. This PCM comes fully pre-programmed to your vehicle’s VIN with the latest GM software updates. It is designed to be a plug-and-play installation, though a security relearn or CASE relearn may be required after installation.
Where is the PCM located on my 2004 GM truck?
On most full-size trucks and SUVs like the Yukon, Sierra, Silverado, and Escalade, the PCM is located in the engine bay on the driver’s side, under the battery tray. On models like the Envoy, Trailblazer, and Rainier, it’s typically found next to the engine air filter box.
What is a CASE relearn?
A CASE (Crankshaft Angle Sensor Error) relearn is a procedure that synchronizes the new PCM with the engine’s crankshaft position sensor. This is often required after PCM replacement to prevent a P1336 trouble code. Most professional scan tools can perform this procedure in a few minutes.
What information do you need from me?
After you complete your purchase, we require your vehicle’s 17-digit VIN to program the module correctly. This ensures that the software matches your specific engine, transmission, and options package for flawless operation.
Is this a new or used part?
This is a high-quality, inspected, and tested original equipment part that has been prepared for service and programmed with new, vehicle-specific software. It meets or exceeds OEM specifications for performance and longevity.