Is your 2004 Suburban 2500 experiencing frustrating engine problems?
If you’re dealing with a persistent check engine light, rough idling, stalling, poor fuel economy, or a no-start condition, a failing Powertrain Control Module (PCM) is often the culprit. The PCM is the central computer of your vehicle, responsible for managing everything from fuel injection and spark timing to transmission shifting and emissions control. When it begins to fail, it can cause a cascade of performance issues that can be difficult to diagnose and leave your reliable truck dead in the water.
From the Diagnostic Bay
We once had a 2004 Sierra with the 6.0L come in on a tow truck. The owner had already replaced the fuel pump and crank sensor trying to solve an intermittent no-start issue. His scanner would sometimes connect, sometimes not. Before condemning the PCM, we did a wiggle test on the main engine harness and checked the ground points on the frame and near the engine block. Sure enough, one of the main PCM ground straps was corroded and brittle. After cleaning the contact point and replacing the strap, the truck fired right up and ran perfectly. Always check your main power and ground connections before replacing a computer—it can save you hundreds of dollars.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ A complete no-start condition where the engine cranks but will not fire.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Inability for diagnostic scan tools to communicate with the PCM.
- ✔ False sensor codes appearing even after replacing the sensor.
The Direct-Fit Solution for Your 2004 Suburban 2500 PCM
Don’t let a faulty computer keep your truck off the road. This Powertrain Control Module, corresponding to service numbers 12586242 and 19299226, is the definitive solution to restore your vehicle’s performance and reliability. We take the guesswork out of the repair by pre-programming the module specifically for your vehicle. When you place your order, simply provide us with your vehicle’s 17-digit VIN. Our technicians will then flash the unit with the latest, most up-to-date software directly from GM. This ensures that the computer is a perfect match for your truck’s specific configuration, including engine size, transmission type, and emissions equipment.
This process makes installation as straightforward as possible. In most cases, it’s a true plug-and-play repair. Once installed, you may need to perform a simple security relearn procedure (often called a key relearn), which can typically be done in your driveway without any special tools. This restores communication between the new PCM and your vehicle’s anti-theft system.
Broad Compatibility Across the GM Lineup
While this is the correct 2004 Suburban 2500 PCM, this versatile module also fits a wide range of other 2004 GM trucks and SUVs. It is a direct replacement for units with service numbers 12586242, 19299226, 89017738, and identifiers such as YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN. Compatible vehicles include:
- Chevrolet Silverado, Tahoe, Avalanche, SSR
- GMC Sierra, Yukon, Envoy XL/XUV
- Cadillac Escalade (Base, ESV, EXT)
- Hummer H2
- Buick Rainier
- Isuzu Ascender
Please verify your original part number or service ID to ensure perfect compatibility. Ordering this VIN-programmed module is the most reliable way to get your vehicle back to factory-spec operation without expensive dealership visits.
Frequently Asked Questions
Do I need to program this computer?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during checkout, and the module will arrive ready to be installed, flashed with the latest GM software for your specific vehicle.
Where can I find my VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on a sticker on the driver’s side door jamb, on a metal plate on the driver’s side of the dashboard visible through the windshield, or on your vehicle’s registration and insurance documents.
Is this part difficult to install?
For someone with basic mechanical skills, the installation is straightforward. It typically involves disconnecting the battery, unplugging the electrical connectors from the old PCM, and unbolting it from its bracket. The new unit installs in the reverse order. A security relearn procedure may be required after installation, which can usually be done without special tools.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM also controls transmission functions, including shift points and line pressure. If your transmission issues are electronic and caused by a faulty PCM, this replacement part will resolve them. However, it will not fix internal mechanical failures within the transmission itself.
How do I confirm this is the correct part for my vehicle?
The best way is to match the service number from your original computer to one of the numbers listed in this description (e.g., 12586242, 19299226). Providing us with your VIN when you order also allows us to double-check and guarantee compatibility.