Restore Peak Performance to Your GM Truck or SUV
Is your 2004 GMC Yukon XL 1500, or another compatible GM vehicle, suffering from perplexing issues like a persistent check engine light, rough idling, poor fuel economy, or even a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain of your vehicle’s engine. This vital component manages everything from fuel injection and spark timing to transmission shifting and emissions control. When it fails, the entire vehicle’s performance and reliability are compromised.
This listing is for a direct-fit replacement PCM, service number 12586242, which is professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN). This isn’t just a generic part; it’s a tailored solution. We flash the module with the latest, most stable software updates directly from GM, ensuring optimal performance, fuel efficiency, and emissions compliance. Your vehicle will run as the manufacturer intended, resolving many of the frustrating drivability problems caused by a faulty original unit.
From the Diagnostic Bay
We had a 2004 Sierra 1500 come into the shop with a random stalling issue that no one could figure out. The customer had already replaced the fuel pump and crank sensor. Scans showed intermittent communication loss with the PCM. Before condemning the expensive module, we did a full ground check. Sure enough, the main engine-to-chassis ground strap located under the vehicle was corroded and frayed. After replacing that simple, inexpensive strap, all the communication issues vanished and the truck ran perfectly. It’s a powerful reminder: always check your grounds before replacing a computer. A bad ground can mimic nearly any electronic failure, including a faulty PCM.
Common Symptoms of a Failing 2004 Yukon XL PCM
If you’re experiencing any of the following issues, a failing PCM could be the culprit. A proper diagnosis is always recommended, but these symptoms are strongly indicative of a problem with the engine’s main computer.
- ✔ Check Engine Light is on with various communication or sensor-related trouble codes (e.g., U-codes, P0601-P0606).
- ✔ The engine cranks but refuses to start.
- ✔ Noticeable decrease in fuel mileage.
- ✔ The engine runs rough, misfires, or stalls unexpectedly.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass state emissions testing.
- ✔ Other modules in the vehicle report a loss of communication with the PCM.
The Importance of VIN Programming
Simply installing a used or non-programmed computer will not work. Modern GM vehicles utilize a sophisticated anti-theft system (PassLock/PassKey) and require the PCM to be perfectly matched to the other modules in the vehicle. Our process eliminates the guesswork and the need for expensive dealership tools. By providing us with your VIN during checkout, you receive a 2004 Yukon XL PCM that is truly plug-and-play. Once installed, you will only need to perform a simple security relearn procedure, which can be done without any special tools and takes about 30 minutes.
Guaranteed Fitment
This module is a direct replacement for service number 12586242 and is compatible with a wide range of 2004 GM trucks and SUVs. Please verify your original part number or match your vehicle from the list below to ensure compatibility. This unit replaces the following service numbers: 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN.
This part fits many vehicles including: Avalanche 1500, Escalade, Sierra 1500/2500/3500, Silverado 1500/2500/3500, Suburban, Tahoe, Yukon, Hummer H2, Envoy, Trailblazer, Rainier, SSR, and Isuzu Ascender. Please confirm the specific ID number for your application.
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM) is the primary computer in your vehicle. It controls all aspects of the engine and transmission to ensure they operate efficiently and produce the lowest possible emissions. It reads data from dozens of sensors and makes real-time adjustments to fuel delivery, ignition timing, and transmission shift points.
Do I need to program this PCM?
No. We handle the programming for you before shipment. You must provide us with your vehicle’s 17-digit VIN when you place your order. This ensures the module is loaded with the correct software for your specific vehicle configuration. After installation, a security relearn procedure is required, which you can do yourself.
Where is the PCM located on my 2004 Yukon XL?
On most 2004 GM full-size trucks and SUVs like the Yukon, Tahoe, and Silverado, the PCM is located in the engine bay on the driver’s side, under the battery tray or near the fender well.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM also functions as the Transmission Control Module (TCM) in these vehicles. If your transmission issues are caused by faulty electronic commands from the computer, this replacement module will resolve them. However, it will not fix internal mechanical problems with the transmission itself.
How do I provide my VIN?
You can add your 17-digit VIN to the notes section during checkout or send us a message through the platform after completing your purchase. We cannot ship your order until we receive the VIN.