Restore Peak Performance to Your 2004 GM Truck or SUV
Is your 2004 GMC Yukon, Silverado, Tahoe, or other GM vehicle suffering from frustrating and hard-to-diagnose issues? An illuminated Check Engine Light, inexplicable stalling, rough idling, or poor fuel economy can often be traced back to a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM is responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When it fails, the symptoms can be widespread and confusing. This replacement PCM, part number 12586242, is the definitive solution to restore your vehicle’s reliability and drivability.
From the Diagnostic Bay
We recently had a 2004 Sierra 1500 in the shop that was driving its owner crazy. It had a persistent random misfire code (P0300) and would shift erratically. The owner had already spent a small fortune replacing spark plugs, ignition coils, and even transmission solenoids with no success. After confirming fuel pressure and sensor data were within spec, we focused on the PCM. A scope revealed the injector driver circuit for cylinder 3 was failing intermittently under load. We installed a correctly programmed 2004 Yukon PCM (the same P59 controller family) and all the issues vanished instantly. It’s a classic case of how a single failing module can mimic a dozen other problems.
Is Your GM Truck Showing Signs of a Failing PCM?
A faulty engine computer can manifest in numerous ways. If you’re experiencing any of the following, a failing PCM could be the culprit. This replacement part is engineered to resolve these common issues and get you back on the road with confidence.
- ✔ Check Engine Light is on with seemingly unrelated or communication-related trouble codes (e.g., U-codes).
- ✔ Your engine stalls for no reason, misfires, or runs rough.
- ✔ The automatic transmission shifts harshly, at the wrong RPM, or not at all.
- ✔ You’re experiencing a no-start or hard-start condition where the engine cranks but won’t fire up.
- ✔ A noticeable and unexplained decrease in fuel economy.
- ✔ Failure to pass state emissions testing due to PCM-related faults.
The Superior Solution: VIN-Programmed for Your Vehicle
Don’t settle for a generic, unprogrammed module from a salvage yard that will cause more problems than it solves. This PCM is a complete solution. Upon purchase, we require your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians will then flash the module with the latest, most stable software updates directly from GM for your specific vehicle configuration. This critical step ensures that the PCM communicates flawlessly with your engine, transmission, anti-lock brake system, and security system, just as it did from the factory. It’s a true plug-and-play solution designed for a seamless installation.
Installation and Setup
Installing your new 2004 Yukon PCM is a straightforward process for a DIY mechanic or any professional technician. On most compatible trucks and SUVs like the Yukon, Sierra, and Escalade, the PCM is located in the engine bay on the driver’s side, typically under or next to the battery tray. After disconnecting the battery, you can unbolt the old module, carefully release the wiring harness connectors, and install the new unit in its place. After installation, you must perform a simple security relearn procedure (also known as a CASE relearn or Passlock relearn). This procedure pairs the new PCM to your vehicle’s anti-theft system and can usually be completed in about 30 minutes without any special scan tools.
Guaranteed Compatibility
This module is a direct replacement for a wide range of vehicles built on the GMT800 platform. It is compatible with service numbers 12586242, 19299226, 89017738 and hardware IDs such as YHTN, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, and YFXP. It fits models including the GMC Yukon, Sierra, Envoy; Chevrolet Silverado, Tahoe, Suburban, Avalanche, Trailblazer, SSR; Cadillac Escalade; Hummer H2; Buick Rainier; and Isuzu Ascender equipped with compatible engines (e.g., 5.3L, 6.0L V8s). Please verify your service number to ensure a perfect match.
Frequently Asked Questions
What information do I need to provide for programming?
After you complete your purchase, you must provide us with your vehicle’s 17-digit VIN. This is essential for us to load the correct GM-certified software and calibrations for your specific engine, transmission, and options.
Is this part difficult to install?
No, the physical installation is simple for anyone with basic mechanical skills. It involves disconnecting the battery, unplugging the old PCM, and plugging in the new one. The only additional step is a security relearn procedure, which is required to sync the new computer with your vehicle’s anti-theft system. Instructions for this are widely available online.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls the transmission’s electronic solenoids and shift points. If your transmission issues are caused by faulty signals from the computer, this replacement 2004 Yukon PCM is the correct fix. However, it will not fix internal mechanical failures within the transmission itself.
Do I need to have my keys reprogrammed?
No, your keys are programmed to the Body Control Module (BCM) or immobilizer system, not the PCM. The security relearn procedure syncs the new PCM to the existing security system, so your original keys will continue to work perfectly.
Is there a core charge for my old PCM?
This listing does not require you to return your old, failed part. There is no core charge associated with this purchase, saving you the time and hassle of shipping your old module back.