Restore Peak Performance to Your 2004 GM Truck or SUV
Is your 2004 GMC Yukon XL 1500, Sierra, or other compatible GM vehicle suffering from perplexing 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 electronic brain of your vehicle. This vital component manages everything from fuel injection and ignition timing to transmission shifting and emissions control. When it falters, your vehicle’s reliability and performance suffer dramatically.
This is a direct-fit replacement PCM, service number 12586242, engineered to restore your vehicle’s factory performance and dependability. We take the guesswork and hassle out of the replacement process. Upon purchase, simply provide us with your vehicle’s VIN. Our technicians will then program the module with the latest, most stable software updates directly from GM. This ensures that your new computer is perfectly matched to your vehicle’s specific configuration, providing seamless integration and optimal function right out of the box.
From the Diagnostic Bay
We had a 2004 Sierra 1500 come into the shop on a tow truck. The owner was frustrated, explaining it would crank but never start, and he had already replaced the fuel pump and crank sensor with no luck. The check engine light was on, but his cheap code reader couldn’t communicate with the computer. We hooked up our professional scan tool and experienced the same communication failure. This is a huge red flag. A dead PCM can’t talk to diagnostic tools. We checked the power and ground feeds to the PCM connector—they were perfect. That confirmed our suspicion: the internal processor of the original PCM had failed. We installed one of these VIN-programmed modules, performed the security relearn, and the truck fired up on the first try and ran like new. The customer was thrilled to have his reliable truck back on the road without wasting more money on unnecessary parts.
Is This the Right 2004 Yukon XL PCM for You?
Verifying the correct part number is crucial for a successful repair. This module, part number 12586242, is a compatible replacement for a wide range of 2004 GM trucks and SUVs. It directly interchanges with several service numbers, including 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN. Please locate the service number on your original computer’s sticker to confirm a match. Installing the correct, properly programmed module is the key to resolving complex electronic issues and avoiding further complications.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is illuminated with various trouble codes (or no communication with scan tool).
- ✔ Engine cranks but will not start.
- ✔ Poor fuel economy and engine performance.
- ✔ Rough or erratic engine idling.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Intermittent stalling for no apparent reason.
- ✔ Failure to pass state emissions testing.
Don’t let a faulty computer keep your truck off the road. This fully programmed PCM is your plug-and-play solution to get back to driving with confidence. Simply install the module, perform the straightforward security relearn procedure, and enjoy restored engine performance and reliability.
Complete Vehicle Fitment List:
This module is compatible with a wide array of 2004 GM vehicles. Please verify your vehicle and original part ID from the list below:
- Avalanche 1500: ID 12586242
- Cadillac Escalade, ESV, EXT: ID 12586242
- Envoy XL, XUV (5.3L): ID YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, YHTN
- Hummer H2: SUT models
- Isuzu Ascender (5.3L)
- Buick Rainier (5.3L): ID YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, YHTN
- Chevrolet SSR: ID YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, YHTN
- Sierra 1500, 2500, 3500 & Denali: ID 12586242
- Silverado 1500, 2500, 3500: ID 12586242
- Suburban 1500, 2500: ID 12586242
- Tahoe: ID 12586242
- Trailblazer EXT (5.3L): ID YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, YHTN
- Yukon & Yukon XL 1500, 2500: ID 12586242
Frequently Asked Questions
What does the PCM actually do in my truck?
The Powertrain Control Module (PCM) is the master computer for your vehicle’s engine and transmission. It takes data from dozens of sensors (like oxygen sensors, throttle position, and engine speed) and uses it to make millions of calculations per second to control fuel delivery, spark timing, and transmission shift points for optimal power, efficiency, and emissions.
Is this module difficult to install?
Physically installing the PCM is straightforward for most DIY mechanics. On vehicles like the Yukon, Sierra, and Silverado, it’s typically located under the hood on the driver’s side, near the battery. After disconnecting the battery, you simply unplug the electrical connectors and unbolt the module. The most important step after installation is performing the security relearn procedure, which can be done without special tools.
Do I need to have this programmed by a dealer?
No. That is the key benefit of our service. We program the computer for you before it ships. All you need to do is provide your vehicle’s 17-digit VIN when you order. This saves you a trip to the dealership and the high cost of their programming services.
What is a security relearn or CASE relearn?
After installing the new PCM, your vehicle’s anti-theft system (PassLock/PassKey) needs to synchronize with the new computer. This is a simple procedure that usually involves turning the key to the ‘ON’ position for about 10-15 minutes, then off, and repeating two more times. This allows the components to communicate and authorize the new PCM. A Crankshaft Variation Relearn (CASE) may also be needed, which requires a scan tool, to ensure the misfire detection system is accurate.
How can I be sure my old PCM is the problem?
While the symptoms listed are common, it’s always best to perform a thorough diagnosis. Key indicators of a bad PCM include a lack of communication with a professional scan tool, multiple unrelated error codes, and having ruled out other components like sensors, wiring, and fuel delivery. If you’re unsure, consulting with a professional mechanic is always a good idea.