Restore Peak Performance to Your GM Truck or SUV
Is your 2004 Chevrolet Suburban, Tahoe, Sierra, or other GM vehicle experiencing frustrating issues like a persistent check engine light, rough idling, stalling, or poor fuel economy? These are classic signs of a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM is responsible for managing everything from fuel injection and spark timing to transmission shifting and emissions control. When it fails, the entire vehicle’s performance suffers. This replacement PCM, service number 12586242, is the definitive solution to get your truck back on the road and running smoothly.
The Plug-and-Play Solution for Your Vehicle
Don’t waste time and money at the dealership with expensive programming fees. We take the guesswork out of the repair. When you order from us, we flash the module with the latest, most stable software updates directly from GM. All we need is your vehicle’s 17-digit Vehicle Identification Number (VIN) at checkout. This ensures that the PCM arrives at your door ready for installation, specifically calibrated for your vehicle’s original configuration. This is not a generic, one-size-fits-all part; it’s a precisely prepared component designed for your exact make and model.
From the Diagnostic Bay
We had a 2004 GMC Yukon come into the shop with a laundry list of complaints: intermittent stalling at red lights, a check engine light with random misfire codes (P0300), and a transmission that shifted harshly. The owner had already replaced the spark plugs, wires, and even a coil pack with no improvement. After hooking up our diagnostic scanner and monitoring live data, we noticed erratic signals coming from the PCM’s driver circuits. Instead of continuing to throw parts at the problem, we identified the root cause: the original engine computer was failing. We installed a VIN-programmed 2004 Suburban 1500 PCM (the same family of modules), and the truck immediately ran like it just rolled off the factory floor. All symptoms were gone. It’s a powerful reminder that sometimes the issue lies with the brain, not the body.
Common Symptoms of a Failing 2004 Suburban 1500 PCM
A failing engine computer can manifest in numerous ways. If you’re experiencing any of the following, a faulty PCM is a likely culprit. This module is the correct component to resolve these issues.
- ✔ Check Engine Light: The PCM may set false trouble codes or fail to communicate with diagnostic scanners.
- ✔ Engine Stalling: Your vehicle may stall unexpectedly while driving or when coming to a stop.
- ✔ Poor Performance: Noticeable loss of power, hesitation during acceleration, and decreased fuel efficiency.
- ✔ Rough Idling: The engine may run erratically or shake while the vehicle is stationary.
- ✔ Starting Issues: Difficulty starting the engine or a complete no-start condition.
- ✔ Harsh Shifting: The automatic transmission may shift erratically, late, or very harshly between gears.
- ✔ Failed Emissions Test: An inability to pass state emissions testing is often directly related to a malfunctioning PCM.
Guaranteed Compatibility
This PCM is a direct replacement for service number 12586242 and is also compatible with a wide range of other service numbers, including 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN. It fits a vast array of 2004 GM models such as the Chevrolet Suburban 1500/2500, Silverado 1500/2500/3500, Tahoe, Avalanche, SSR, Trailblazer EXT; GMC Sierra 1500/2500/3500, Yukon, Envoy XL/XUV; Cadillac Escalade; Hummer H2; Buick Rainier; and Isuzu Ascender. Please verify your original part number to ensure a perfect match.
Frequently Asked Questions
Do I need to have this PCM programmed?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during checkout, and the module will arrive ready for installation. It’s a true plug-and-play solution.
Where is the PCM located on my 2004 Suburban 1500?
On most GM trucks and full-size SUVs from this year, including the Suburban, the PCM is located in the engine bay on the driver’s side, under the battery tray.
What is the difference between a PCM, ECM, and ECU?
These terms are often used interchangeably. ECM (Engine Control Module) and ECU (Engine Control Unit) typically refer to a computer that only manages engine functions. A PCM (Powertrain Control Module) is more comprehensive and manages both the engine and the automatic transmission, which is standard on these vehicles.
Will this fix my check engine light?
If the check engine light and associated diagnostic trouble codes (DTCs) are being caused by a faulty PCM, then yes, this part will resolve the issue. It’s always best to have the codes read by a scanner to help confirm the diagnosis before ordering.
Is any additional setup required after installation?
In some cases, a security relearn procedure (often called a CASE relearn or Passlock relearn) may be necessary. This is a simple procedure that can typically be done without special tools and involves a series of key cycles. Instructions are widely available online for your specific vehicle.