Is Your 2004 Silverado 2500 Running Rough?
If your truck is suffering from erratic behavior, poor fuel economy, a persistent check engine light, or even a no-start condition, the culprit is often a failing Powertrain Control Module (PCM). As the central computer for your engine, the PCM is responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When it starts to fail, it can cause a cascade of frustrating and difficult-to-diagnose problems. This replacement PCM, part number 89017739, is the definitive solution to restore your vehicle’s performance and reliability.
This isn’t just a generic, off-the-shelf part. We take the guesswork out of the repair by programming the module specifically for your truck. After your purchase, simply provide us with your vehicle’s VIN. Our technicians will then flash the unit with the latest, most stable GM-certified software updates for your exact configuration. This ensures seamless integration and optimal performance right out of the box, eliminating the need for an expensive trip to the dealership for programming.
Expert Pro Tip
Expert Pro Tip
Before replacing your PCM, always perform a thorough check of the vehicle’s power and ground connections. A corroded ground wire or a faulty battery cable can mimic the symptoms of a bad PCM, leading to a misdiagnosis. Specifically, check the main engine-to-chassis ground strap and the connections at the battery terminals. A few minutes with a multimeter can save you hundreds of dollars.
Diagnosing a Faulty 2004 Silverado 2500 PCM
A failing engine computer can manifest in numerous ways, often intermittently at first. If you’re experiencing any of the following issues, it’s a strong indication that your PCM may need replacement. Keep an eye out for multiple symptoms occurring together, which points more directly to a central computer failure rather than an individual sensor issue.
- ✔ Check Engine Light: The light is on, and you may have codes related to PCM internal failure, memory errors, or communication faults (U-codes).
- ✔ No-Start or Hard Starting: The engine cranks but refuses to start, or takes an unusually long time to fire up, either hot or cold.
- ✔ Poor Engine Performance: Noticeable loss of power, hesitation during acceleration, stumbling, or misfiring.
- ✔ Erratic Shifting: The transmission may shift harshly, at the wrong RPM, or get stuck in one gear (limp mode).
- ✔ Reduced Fuel Economy: A sudden and unexplained drop in your truck’s MPG is a common symptom as the PCM loses its ability to efficiently manage the fuel mixture.
- ✔ Stalling: The engine may stall unexpectedly while driving or when coming to a stop.
- ✔ Communication Issues: Your OBD-II scan tool may be unable to connect to the computer.
Plug-and-Play Installation
Because we program this module to your VIN, installation is straightforward for most users. Located on the driver’s side of the engine bay, under the battery tray, the 2004 Silverado 2500 PCM can typically be swapped in with basic hand tools. Once installed, you will need to perform a security relearn procedure (often called a key relearn or anti-theft relearn), which pairs the new module to your vehicle’s keys. This procedure does not require special tools and can be found in many online resources or your vehicle’s service manual. This simple process ensures your truck starts and runs as it should, restoring factory performance and getting you back on the road with confidence.
Frequently Asked Questions
Expert Pro Tip
Before replacing your PCM, always perform a thorough check of the vehicle’s power and ground connections. A corroded ground wire or a faulty battery cable can mimic the symptoms of a bad PCM, leading to a misdiagnosis. Specifically, check the main engine-to-chassis ground strap and the connections at the battery terminals. A few minutes with a multimeter can save you hundreds of dollars.