Restore Peak Performance to Your GM Truck or SUV
Is your 2004 Silverado 3500 suffering from a persistent check engine light, erratic shifting, poor fuel economy, or a frustrating no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. This replacement PCM, service number 12586242, is the definitive solution to restore your vehicle’s factory performance, reliability, and efficiency. It’s not just a part; it’s a plug-and-play fix, professionally programmed to your specific vehicle before it ever leaves our facility.
From the Diagnostic Bay
We had a customer with a 2004 Sierra 1500, a cousin to the Silverado, who had spent nearly a thousand dollars chasing a ghost. He replaced O2 sensors, the MAF sensor, and even the throttle body based on codes his scanner was throwing. The truck still ran rough and the check engine light always came back. When he finally brought it to us, we traced the issue back to the source: intermittent failures within the original PCM. A faulty computer was sending bad signals, causing the other parts to seem faulty. Installing a correctly programmed PCM solved all the issues instantly. This highlights the importance of diagnosing the central controller when multiple, seemingly unrelated codes appear.
Common Symptoms of a Failing 2004 Silverado 3500 PCM
If your vehicle is experiencing any of the following issues, a faulty engine computer could be the culprit. Replacing it with this pre-programmed unit can resolve these problems and get your truck running like new again.
- ✔ Check Engine Light (CEL) is illuminated, often with communication error codes (U-codes).
- ✔ Vehicle fails to start or starts intermittently.
- ✔ Noticeable decrease in fuel mileage.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine stalls, stumbles, or idles roughly.
- ✔ Failure to pass emissions testing.
- ✔ Apparent loss of engine power and acceleration.
VIN-Programmed for a Seamless Installation
Don’t settle for a generic, off-the-shelf computer that requires expensive dealership programming. We take the hassle and guesswork out of the process. After your purchase, simply provide us with your vehicle’s 17-digit VIN. Our technicians will then flash this module with the latest, most stable GM-certified software specific to your 2004 Silverado 3500 PCM. This ensures perfect compatibility with your engine, transmission, and all factory-installed options. The result is a straightforward installation that restores your vehicle’s original functionality without the need for a trip to the dealer for programming.
This module is a direct replacement for service numbers 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN. Please verify your original part number to ensure compatibility.
Guaranteed Fitment For Your Vehicle
This Electronic Control Module is a guaranteed fit for a wide range of 2004 GM models. Please confirm your vehicle and original module ID from the list below:
- Chevrolet Silverado, Sierra (1500, 2500, 3500) with 6.0L gas engine and ID 12586242.
- Chevrolet Suburban, Tahoe, Yukon, Yukon XL with 6.0L engine and ID 12586242.
- Cadillac Escalade (Base, ESV, EXT) with ID 12586242.
- Chevrolet Avalanche 1500 with ID 12586242.
- GMC Envoy XL/XUV, Chevrolet Trailblazer EXT with 5.3L engine and matching service ID.
- Buick Rainier, Isuzu Ascender with 5.3L engine and matching service ID.
- Chevrolet SSR, Hummer H2 with matching service ID.
Frequently Asked Questions
Do I need to get this PCM programmed?
No. This PCM comes pre-programmed to your vehicle’s specific VIN. Simply provide us with your VIN during checkout, and we handle all the programming before shipping the part to you.
Where is the PCM located on my 2004 Silverado 3500?
On most 2004 GM trucks like the Silverado, Sierra, and Suburban, the PCM is located in the engine bay on the driver’s side, under the battery tray or near the firewall.
What is a VIN and why do you need it?
The VIN (Vehicle Identification Number) is a unique 17-digit code for your specific vehicle. We use it to load the exact factory software and calibrations for your truck’s engine, transmission, and options, ensuring perfect compatibility.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM, then yes, this part will resolve the issue. However, it’s crucial to ensure that other components like sensors or wiring are not the root cause of the problem.
Is any additional setup required after installation?
In many cases, this is a plug-and-play installation. However, some GM vehicles may require a simple security relearn procedure (often called Passlock or VATS relearn) which can be done without special tools and typically takes 10-30 minutes. Instructions are readily available online for this process.