Restore Peak Performance to Your GM Truck or SUV
Is your 2004 GMC Yukon, Sierra, Escalade, or other GM vehicle experiencing frustrating issues like a persistent check engine light, rough idling, stalling, or a complete no-start condition? These are classic signs of a failing Powertrain Control Module (PCM). The PCM is the central computer of your vehicle’s engine, managing everything from fuel mixture and ignition timing to transmission shifting and emissions control. When it fails, the entire vehicle’s performance and reliability are compromised.
This is a direct replacement PCM, part number 12586242, engineered to solve these problems and restore your vehicle’s factory operation. We take the guesswork out of the repair. Simply provide your vehicle’s Vehicle Identification Number (VIN) during checkout, and our technicians will program the module with the latest, most stable software updates directly from GM. This ensures perfect compatibility and optimal performance, right out of the box. Your new computer arrives ready for a straightforward installation, getting you back on the road with confidence.
From the Diagnostic Bay
We had a 2004 Sierra 1500 come in with a stubborn P0300 (Random Misfire) code that just wouldn’t clear. The owner had already replaced plugs, wires, coils, and even the crankshaft position sensor. Everything checked out mechanically. After hooking up the scope, we noticed the control signal for the cylinder 3 injector driver was erratic. The signal was breaking down inside the PCM itself, a common issue with these P59 controllers after years of heat cycles. We installed a correctly programmed PCM, performed the security relearn, and the truck ran perfectly smooth. The misfire was gone for good. Don’t chase ghosts in the wiring—sometimes the problem lies directly with the computer.
Diagnosing Your 2004 Yukon PCM Failure
A faulty engine computer can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following, your PCM may be the culprit:
- ✔ Check Engine Light is on with various trouble codes (DTCs).
- ✔ Vehicle fails to start or starts intermittently.
- ✔ Poor engine performance, including hesitation, stumbling, or lack of power.
- ✔ Reduced fuel economy for no apparent reason.
- ✔ Automatic transmission shifts erratically, harshly, or at the wrong times.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Seemingly unrelated electrical issues or warning lights appearing on the dash.
Guaranteed Compatibility
This module is a direct replacement for service number 12586242 and is also compatible with a wide range of other service numbers, ensuring a perfect fit for your specific application. It is compatible with service numbers: 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN. Please verify the part number on your original module to ensure a perfect match for your vehicle, which includes models like the Envoy, Rainier, SSR, Sierra, Silverado, Suburban, Tahoe, Trailblazer, Escalade, Hummer H2, and more from the 2004 model year.
Frequently Asked Questions
Do I need to do anything after installing this PCM?
While this PCM comes programmed to your VIN, you will need to perform a security relearn procedure (often called Passlock or Passkey relearn) so the module can communicate with your vehicle’s anti-theft system. This procedure is simple, requires no special tools, and typically takes about 30 minutes. Instructions are readily available online for your specific model.
Where do I find my VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, your insurance card, or on the driver’s side of the dashboard, visible through the windshield.
Is this a plug-and-play part?
Yes, this is a plug-and-play module. The physical installation involves disconnecting the battery, unplugging the electrical connectors from your old PCM, removing it, and installing the new one. The only additional step is the security relearn procedure mentioned above.
Will this fix my specific problem?
This PCM will correct any issues directly caused by a faulty engine computer. It is crucial to properly diagnose your vehicle’s problem before ordering. If your vehicle has other underlying issues (e.g., bad sensors, wiring shorts), replacing the PCM will not resolve them.
How do I provide my VIN?
Please enter your vehicle’s VIN in the designated notes section during the checkout process. If you forget, we will contact you via email to retrieve it before we can program and ship your module.