Restore Your Vehicle’s Performance and Reliability
Is your 2004 GM truck or SUV running rough, shifting erratically, or refusing to start? A failing Powertrain Control Module (PCM) is often the hidden culprit behind these frustrating and unpredictable issues. This isn’t just an inconvenience; it’s a matter of confidence and safety. Take control of your repair with our pre-programmed Engine Control Module, a direct-fit solution designed to restore your vehicle’s factory performance and get you back on the road with peace of mind. We flash this unit with the latest GM software updates specifically for your vehicle’s VIN, eliminating the need for expensive dealership programming.
Key Symptoms of a Failing PCM & Benefits of Replacement
If you’re experiencing any of the following, it might be time to replace your engine computer. Addressing the problem now prevents further complications and restores the smooth operation you expect.
- ✔ Check Engine Light: Persistent illumination with codes like P0601, P0602, P0606, or other communication errors.
- ✔ Poor Performance: Noticeable loss of power, hesitation during acceleration, and decreased fuel economy.
- ✔ Erratic Shifting: Harsh or delayed gear changes in your automatic transmission.
- ✔ Stalling or No-Start: The engine may stall intermittently or fail to start altogether, leaving you stranded.
- ✔ Restored Drivability: A new PCM ensures precise fuel delivery, ignition timing, and transmission control for a like-new driving experience.
- ✔ Plug-and-Play Solution: Arrives programmed to your VIN, making the installation process straightforward for both DIYers and professional technicians.
Guided Installation to Restore Your Ride
Replacing the PCM is a manageable job that you can do with basic hand tools. Our pre-programmed module simplifies the process significantly. Follow these steps for a successful installation.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to allow all capacitors to discharge.
- Locate the PCM: On most compatible vehicles like the Escalade, Silverado, or Tahoe, the PCM is located under the hood on the driver’s side, near the battery or inside the air filter box housing.
- Disconnect the Connectors: Carefully release the locking tabs on the electrical harnesses and pull them straight out from the module. Avoid bending or forcing the pins.
- Remove the Old Module: Unbolt the mounting hardware holding the old PCM in place and remove it from the vehicle.
- Install the New PCM: Mount your new, pre-programmed PCM in the same location and secure it with the original hardware.
- Reconnect Everything: Firmly plug the electrical harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn: Your vehicle may require a simple security relearn procedure (often called a CASE learn). This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine. Consult your vehicle’s service manual for the exact procedure.
Tailored Fit for Your GM Vehicle
This module is a direct replacement for service number 12586242 and is compatible with a wide range of 2004 GM models. Please verify your service number to ensure a perfect match. Compatible service numbers include: 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN.
This part fits the following vehicles:
- Cadillac Escalade, ESV, EXT (2004)
- Chevrolet Avalanche 1500 (2004)
- Chevrolet Silverado 1500, 2500, 3500 (2004, gasoline)
- Chevrolet SSR (2004)
- Chevrolet Suburban 1500, 2500 (2004)
- Chevrolet Tahoe (2004)
- Chevrolet Trailblazer EXT (2004, 5.3L)
- GMC Envoy XL, XUV (2004, 5.3L)
- GMC Sierra 1500, 2500, 3500, Denali (2004, gasoline)
- GMC Yukon, XL 1500, XL 2500 (2004)
- Hummer H2 (2004)
- Buick Rainier (2004, 5.3L)
- Isuzu Ascender (2004, 5.3L)
Do I need to do anything after installing this PCM?
Yes. While we program the module to your VIN, you will likely need to perform a security relearn procedure, also known as a CASE (Crankshaft Angle Sensor Error) relearn. This can often be done without special tools and syncs the new PCM with your vehicle’s anti-theft and crankshaft position systems. Instructions are widely available online for your specific model.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship your order until we receive this information, as the programming is specific to your truck or SUV.
Is this a plug-and-play part?
For the most part, yes. Because we flash it with your vehicle’s specific software, it eliminates the need for a trip to the dealer for programming. The only additional step is the security/CASE relearn, which is a standard procedure when replacing this component.
Will this fix my transmission shifting problems?
If the shifting issues are caused by faulty electronic signals from the PCM, then yes, this part is very likely to solve the problem. The PCM controls the transmission’s shift points and line pressure. However, it will not fix internal mechanical failures within the transmission itself.
What is the difference between a PCM, ECM, and ECU?
The terms are often used interchangeably. PCM (Powertrain Control Module) is the most accurate for these GM vehicles as it controls both the engine and the transmission. ECM (Engine Control Module) typically controls only the engine. ECU (Electronic Control Unit) is a more generic term for any electronic module in a vehicle.