Restore Peak Performance to Your GM Truck or SUV
Is your truck or SUV suffering from baffling issues like erratic shifting, poor fuel economy, or a persistent check engine light that just won’t go away? The Powertrain Control Module (PCM) is the central command center of your vehicle, and when it falters, it can cause a cascade of frustrating problems. This replacement PCM, service number 12586242, is the definitive solution to get your vehicle back on the road with the reliability and performance you depend on. Forget the guesswork and the costly diagnostic fees; this is the core of your vehicle’s operating system, restored and ready for duty.
From the Shop Floor: Chasing Electrical Ghosts
I once had a 2004 Sierra in the bay with a random misfire (P0300) that the owner had been fighting for months. He’d replaced plugs, wires, coils, even the fuel pump. The truck ran fine one minute and terribly the next. After hours of diagnostics, we traced it to a failing ignition driver inside the original PCM. It was a ghost in the machine. Installing a properly programmed module like this one didn’t just fix the misfire; it gave the owner back his confidence in a truck he relied on every single day. That’s the peace of mind we’re offering here.
Warning Signs and Lasting Benefits
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, this module is your solution:
- ✔ Unexplained Check Engine Light with codes like P0601, P0606, or communication errors (U-codes).
- ✔ Harsh or delayed transmission shifting.
- ✔ Engine stalling, stumbling, or a no-start condition.
- ✔ A noticeable drop in fuel mileage.
- ✔ Inaccurate or failing gauge readings.
- ✔ Sensor-related codes that persist even after replacing the sensor itself.
Replacing your old module with our pre-programmed unit restores the precise fuel and timing calculations, ensures crisp transmission shifts, and provides the stable operating foundation your vehicle needs for years of dependable service.
Guided Installation for a Confident Fix
Installing your replacement 2004 Silverado 2500 PCM is a straightforward process that you can handle with basic tools. Follow these steps for a successful repair:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work. This prevents accidental shorts and protects the sensitive electronics.
- Locate the Module: On most compatible trucks and SUVs (like the Silverado, Sierra, Tahoe, Yukon), you’ll find the PCM located on the driver’s side, under the hood, near the battery, often mounted in a black plastic bracket. On vehicles like the Trailblazer or Envoy, it’s typically next to the air filter box.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released—don’t force them. Once disconnected, unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Seat the new, pre-programmed module into the bracket and secure it. Reconnect the electrical harnesses, ensuring they click firmly into place. Reconnect your vehicle’s battery.
- Final Steps: In many cases, you will need to perform a security relearn procedure (often called Passlock or Passkey) to allow the vehicle to start. This procedure is simple and can be found online or in your owner’s manual. Some vehicles may also require a Crankshaft Variation Relearn (CASE Relearn) with a scan tool to clear a P1336 code, though this does not typically affect driveability.
Tailored Fit for Your Ride
This module is a direct-fit replacement, programmed specifically for your vehicle’s VIN. It is compatible with a wide range of 2004 GM models that use service number 12586242 or any of the following interchangeable numbers: 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, YHTN. Please verify your service number to ensure perfect compatibility.
RAINIER 04 Electronic Control Module; 5.3L (next to air box), ID YFXL
SSR 04 Electronic Control Module; (next to air box), ID YHTN
SIERRA DENALI 04 Electronic Control Module; (LH front under battery), ID 12586242
TRAILBLAZER EXT 04 Electronic Control Module; 5.3L (next to air box), ID YFKX
ENVOY XL 04 Electronic Control Module; 5.3L (next to air box), ID YFKH
RAINIER 04 Electronic Control Module; 5.3L (next to air box), ID YFKJ
SSR 04 Electronic Control Module; (next to air box), ID YFKD
SSR 04 Electronic Control Module; (next to air box), ID YFKX
SSR 04 Electronic Control Module; (next to air box), ID YFXL
TRAILBLAZER EXT 04 Electronic Control Module; 5.3L (next to air box), ID YFXP
ENVOY XL 04 Electronic Control Module; 5.3L (next to air box), ID YFXL
RAINIER 04 Electronic Control Module; 5.3L (next to air box), ID YFXM
RAINIER 04 Electronic Control Module; 5.3L (next to air box), ID YFXN
SIERRA 1500 PICKUP 04 Electronic Control Module; (LH front under battery), w/o hybrid option; w/o 4.3L; ID 12586242
SILVERADO 3500 PICKUP 04 Electronic Control Module; (LH front under battery), gasoline, 6.0L, ID 12586242
SUBURBAN 2500 04 Electronic Control Module; (LH front under battery), 6.0L, ID 12586242
TRAILBLAZER EXT 04 Electronic Control Module; 5.3L (next to air box), ID YFXN
ENVOY XUV 04 Electronic Control Module; 5.3L (next to air box), ID YFKH
ENVOY XUV 04 Electronic Control Module; 5.3L (next to air box), ID YFXL
SSR 04 Electronic Control Module; (next to air box), ID YFKF
SSR 04 Electronic Control Module; (next to air box), ID YFKH
SSR 04 Electronic Control Module; (next to air box), ID YFXM
SSR 04 Electronic Control Module; (next to air box), ID YFXN
SILVERADO 1500 PICKUP 04 Electronic Control Module; (LH front under battery), w/o hybrid option; w/o 4.3L; ID 12586242
YUKON 04 Electronic Control Module; (LH front under battery), ID 12586242
ENVOY XL 04 Electronic Control Module; 5.3L (next to air box), ID YFKX
ESCALADE 04 Electronic Control Module; (LH front under battery), ID 12586242
AVALANCHE 1500 04 Electronic Control Module; (LH front under battery), ID 12586242
ENVOY XUV 04 Electronic Control Module; 5.3L (next to air box), ID YFXP
ESCALADE ESV 04 Electronic Control Module; (LH front under battery), ID 12586242
RAINIER 04 Electronic Control Module; 5.3L (next to air box), ID YFXP
ISUZU ASCENDER 04 Electronic Control Module; (LH engine), 5.3L
ENVOY XL 04 Electronic Control Module; 5.3L (next to air box), ID YFXM
ENVOY XUV 04 Electronic Control Module; 5.3L (next to air box), ID YHTN
RAINIER 04 Electronic Control Module; 5.3L (next to air box), ID YHTN
TAHOE 04 Electronic Control Module; (LH front under battery), ID 12586242
TRAILBLAZER EXT 04 Electronic Control Module; 5.3L (next to air box), ID YHTN
ENVOY XL 04 Electronic Control Module; 5.3L (next to air box), ID YFKD
TRAILBLAZER EXT 04 Electronic Control Module; 5.3L (next to air box), ID YFKD
TRAILBLAZER EXT 04 Electronic Control Module; 5.3L (next to air box), ID YFXL
ENVOY XUV 04 Electronic Control Module; 5.3L (next to air box), ID YFKJ
RAINIER 04 Electronic Control Module; 5.3L (next to air box), ID YFKD
TRAILBLAZER EXT 04 Electronic Control Module; 5.3L (next to air box), ID YFKJ
ENVOY XL 04 Electronic Control Module; 5.3L (next to air box), ID YFKF
HUMMER H2 04 Electronic Control Module; (LH front under battery), SUT
SSR 04 Electronic Control Module; (next to air box), ID YFKJ
SUBURBAN 1500 04 Electronic Control Module; (LH front under battery), ID 12586242
ENVOY XL 04 Electronic Control Module; 5.3L (next to air box), ID YFXP
ENVOY XUV 04 Electronic Control Module; 5.3L (next to air box), ID YFXM
RAINIER 04 Electronic Control Module; 5.3L (next to air box), ID YFKH
TRAILBLAZER EXT 04 Electronic Control Module; 5.3L (next to air box), ID YFKF
ENVOY XL 04 Electronic Control Module; 5.3L (next to air box), ID YFKJ
SILVERADO 2500 PICKUP 04 Electronic Control Module; (LH front under battery), gasoline, 6.0L, ID 12586242
TRAILBLAZER EXT 04 Electronic Control Module; 5.3L (next to air box), ID YFKH
YUKON XL 1500 04 Electronic Control Module; (LH front under battery), ID 12586242
RAINIER 04 Electronic Control Module; 5.3L (next to air box), ID YFKF
ENVOY XL 04 Electronic Control Module; 5.3L (next to air box), ID YFXN
ENVOY XUV 04 Electronic Control Module; 5.3L (next to air box), ID YFKX
SIERRA 2500 PICKUP 04 Electronic Control Module; (LH front under battery), gasoline, 6.0L, ID 12586242
SIERRA 3500 PICKUP 04 Electronic Control Module; (LH front under battery), gasoline, 6.0L, ID 12586242
TRAILBLAZER EXT 04 Electronic Control Module; 5.3L (next to air box), ID YFXM
ENVOY XUV 04 Electronic Control Module; 5.3L (next to air box), ID YFKD
ENVOY XUV 04 Electronic Control Module; 5.3L (next to air box), ID YFKF
ENVOY XUV 04 Electronic Control Module; 5.3L (next to air box), ID YFXN
ESCALADE EXT 04 Electronic Control Module; (LH front under battery), ID 12586242
RAINIER 04 Electronic Control Module; 5.3L (next to air box), ID YFKX
SSR 04 Electronic Control Module; (next to air box), ID YFXP
YUKON XL 2500 04 Electronic Control Module; (LH front under battery), 6.0L, ID 12586242
Frequently Asked Questions
What exactly is VIN programming?
VIN programming is the process of loading your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM-certified software onto the module. This ensures the PCM communicates perfectly with your truck’s engine, transmission, and options, just like the original unit from the factory.
Do I need to do anything after I install it?
Yes, after installation, you will most likely need to perform a security relearn procedure. This syncs the new PCM with your vehicle’s anti-theft system and allows the engine to start. This procedure is simple, requires no special tools, and instructions are readily available online.
How do I find my part or service number?
Your original PCM will have a sticker on it with the service number. It’s crucial to match this number to one of the compatible numbers listed to guarantee a perfect fit and function for your specific vehicle.
Will this fix my specific problem?
While this PCM is the solution for a wide range of electronic, engine, and transmission issues, proper diagnosis is key. This module will correct any problems originating from the PCM itself, but it will not fix underlying mechanical issues or faulty sensors elsewhere on the vehicle.
Is this a difficult part to replace for a DIYer?
Not at all! For most DIYers with a basic set of tools, this is a very manageable job that can be completed in under an hour. The most important parts are disconnecting the battery and being gentle with the electrical connectors.