Is your 2004 GM truck, van, or SUV suffering from frustrating and unpredictable issues? A faulty Powertrain Control Module (PCM) can cause everything from a persistent check engine light and poor fuel economy to stalling, erratic shifting, or even a no-start condition. This replacement engine computer is the reliable, straightforward solution to restore your vehicle’s performance and get you back on the road with confidence.
Common Symptoms & Your Solution
A failing PCM can be difficult to diagnose, but it often reveals itself through a specific set of problems. If you’re experiencing any of the following, this module is the definitive fix:
- Check Engine Light (CEL): Especially for internal module error codes like P0601, P0602, or P0606.
- Engine Performance Issues: Stalling, hesitation, rough idling, misfires, or a noticeable loss of power.
- Transmission Problems: Harsh or delayed shifting, or the transmission getting stuck in one gear (limp mode).
- No-Start Condition: The engine cranks but refuses to start, often due to a lack of fuel injector or ignition coil command from the PCM.
- Communication Errors: Your scan tool cannot communicate with the engine computer.
This professionally programmed 2004 GM PCM 89017739 is designed to resolve these issues by replacing the faulty core of your vehicle’s engine management system.
Features & Benefits
- ✔ VIN-Programmed for Your Vehicle: We flash this module with your vehicle’s specific VIN and the latest GM software updates before it ships. This ensures perfect compatibility and function right out of the box.
- ✔ Simple Installation Process: Because the programming is done for you, this becomes a plug-and-play repair. No need for an expensive trip to the dealership for programming.
- ✔ Restores Original Performance: A new, properly functioning PCM brings back the smooth shifting, consistent power delivery, and fuel efficiency you expect from your vehicle.
- ✔ Direct-Fit Replacement: Guaranteed to be a perfect match for vehicles requiring part numbers 89017739 or 12586243, ensuring a hassle-free installation.
- ✔ Peace of Mind Guarantee: This unit is backed by our one-year replacement warranty.
Expert Insight: Why VIN Programming is Non-Negotiable
Many people are tempted to grab a used computer from a salvage yard, hoping for a cheap fix. This almost never works. Your vehicle’s PCM is the central hub, communicating with the engine, transmission, anti-lock brakes, and even the instrument cluster. The VIN-specific programming contains critical information about your vehicle’s options, tire size, gear ratios, and security system. Installing an unprogrammed or incorrectly programmed module will, at best, result in a check engine light and poor performance. At worst, it can prevent the vehicle from starting at all due to security conflicts. Our pre-programming service for the 2004 GM PCM 89017739 eliminates this massive headache, saving you time, money, and frustration.
Frequently Asked Questions
How do I provide my VIN number?
After you complete your purchase, you will need to send us your vehicle’s 17-digit VIN (Vehicle Identification Number). We cannot ship the module until we receive this information, as it is required for the programming service.
Is any additional programming required after installation?
In most cases, no further programming is needed. However, some GM vehicles may require a security relearn procedure (often called Passlock or Passkey) and a Crankshaft Variation Relearn (CASE). These are simple procedures that can typically be done without special tools. Instructions can be readily found online for your specific model.
Will this fit my vehicle?
This module fits a wide range of 2004 GM models, including the Trailblazer EXT, Envoy XL/XUV, Silverado/Sierra trucks, Express/Savana vans, Corvette, GTO, and more. Please verify that your original part number is 89017739 or 12586243 and check the compatibility list on this page to ensure a perfect match.
What tools are needed for installation?
Installation is typically straightforward, requiring only basic hand tools like a socket set to disconnect the battery and unbolt the module. The most important step is to disconnect the vehicle’s battery before you begin to avoid any electrical damage.
Is this the same as an ECM or ECU?
Yes. The terms PCM (Powertrain Control Module), ECM (Engine Control Module), and ECU (Engine Control Unit) are often used interchangeably. They all refer to the main computer that controls your vehicle’s engine functions.