Is Your 2003 Blazer or Jimmy Experiencing Engine Problems?
If you’re dealing with a persistent check engine light, erratic engine behavior, stalling, or a no-start condition in your 2003 Chevrolet Blazer S10 or GMC Jimmy S15, a failing Powertrain Control Module (PCM) is a likely culprit. As the central computer of your vehicle, the PCM is responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When it begins to fail, it can cause a cascade of frustrating and difficult-to-diagnose issues that can take your reliable truck off the road.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the guesswork and hassle out of the repair by pre-programming this module specifically for your vehicle. Using the Vehicle Identification Number (VIN) you provide, we flash the unit with the latest, most stable software updates directly from General Motors. This ensures optimal performance, fuel efficiency, and seamless communication with all other modules in your vehicle, 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 main power and ground connections. A corroded or loose ground wire at the engine block or battery can cause voltage drops that mimic the symptoms of a failed PCM. Also, inspect the wiring harness connectors at the module for any signs of corrosion, moisture, or bent pins. A simple connection issue is often misdiagnosed as a catastrophic computer failure.
Symptoms of a Failing 2003 Blazer S10 PCM
- ✔ Unexplained Check Engine Light (CEL) illumination, often with communication-related trouble codes (U-codes).
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Rough or inconsistent idling.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Intermittent no-start or crank-no-start conditions.
- ✔ Failure to pass state emissions testing.
- ✔ Other warning lights on the dashboard may illuminate without a clear cause.
The Direct-Fit Solution for Your GM Truck or Van
This module, part number 89017733, is the correct replacement for a wide range of GM vehicles from this era, not just the Blazer and Jimmy. Its robust design and VIN-specific programming make it the ideal choice for restoring your vehicle’s factory performance and reliability. By providing us with your VIN during checkout, you ensure that the module you receive is perfectly matched to your vehicle’s specific configuration, including engine size, transmission type, and emissions equipment. The installation is straightforward for a DIY mechanic or any professional technician. While the unit is programmed for your vehicle, some GM platforms may require a simple, on-vehicle security relearn procedure (often called a CASE relearn) to synchronize the new PCM with your vehicle’s anti-theft system. This procedure can typically be done without special tools and instructions are widely available.
This module is a direct replacement for a variety of service numbers, including: 12581565, 12570557, 12570558, 12576106, 12576869, 12578127, 88864822, and 89017733. It is also the specified electronic control module for numerous other GM models, such as the GMC Safari, Chevy Astro, Chevy Express, GMC Savana, and various Sierra and Silverado pickups with the 4.3L or 8.1L engines. Restore your vehicle’s brain and get it running like new again.
Frequently Asked Questions
Expert Pro Tip
Before replacing your PCM, always perform a thorough check of the vehicle’s main power and ground connections. A corroded or loose ground wire at the engine block or battery can cause voltage drops that mimic the symptoms of a failed PCM. Also, inspect the wiring harness connectors at the module for any signs of corrosion, moisture, or bent pins. A simple connection issue is often misdiagnosed as a catastrophic computer failure.