Is your 2003 Chevy S10, GMC Sonoma, or another GM truck experiencing frustrating and unpredictable engine problems? Issues like a persistent Check Engine Light, rough idling, stalling, or a complete no-start condition often point directly to a failing Powertrain Control Module (PCM). The PCM is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shifting. When it fails, the entire vehicle’s performance suffers. This replacement PCM, part number 12576869, is the definitive solution to restore your vehicle’s reliability and driving performance.
This isn’t just a generic, off-the-shelf part. We provide a fully plug-and-play solution by programming the module specifically for your vehicle before it ships. Simply provide us with your vehicle’s VIN (Vehicle Identification Number) during checkout, and our technicians will flash the unit with the latest, most stable GM-approved software updates. This critical step ensures seamless communication between the module and all other systems in your truck, eliminating the need for an expensive trip to the dealership for programming.
Common Symptoms of a Failing 2003 S10 Powertrain Control Module
If you’re experiencing any of the following issues, a faulty PCM is a very likely culprit. A failing module can manifest in numerous ways, often mimicking other component failures. Verifying these symptoms can help you diagnose the problem correctly the first time.
- ✔ Persistent and illuminated Check Engine Light (CEL)
- ✔ Engine stalling or shutting off while driving
- ✔ Rough or erratic idling
- ✔ Difficulty starting the engine or a no-start condition
- ✔ Noticeable decrease in fuel economy
- ✔ Poor acceleration and overall engine performance
- ✔ Harsh or incorrect automatic transmission shifting
- ✔ Communication errors with diagnostic scan tools
- ✔ Unexplained error codes for various sensors
This module is a direct replacement for a wide range of GM vehicles and is compatible with multiple service numbers, ensuring a perfect match for your application. It is a reliable, tested original equipment part that meets or exceeds factory specifications.
Guaranteed Compatibility & Fitment
This Powertrain Control Module is a direct fit for the following vehicles and part numbers. Please verify your vehicle and options below.
Part Number: 12576869
Interchangeable Service Numbers: 12581565, 8125815650, 12570557, 12570558, 12576106, 12578127, 8125781270, 88864822, 89017733
Fitment Includes:
- 2003 S10/S15/SONOMA: Electronic Control Module; (RH front engine compartment), 4.3L
- 2003 BLAZER S10/JIMMY S15: Electronic Control Module; (RH front engine compartment)
- 2003 ASTRO / SAFARI (GMC): Electronic Control Module; (LH front by battery)
- 2003 EXPRESS / SAVANA 1500, 2500, 3500 VAN: Electronic Control Module; (LH rear engine compartment)
- 2003 SIERRA / SILVERADO 1500 PICKUP: Electronic Control Module; (LH front under battery), w/4.3L
- 2003 SIERRA / SILVERADO 2500 & 3500 PICKUP: Electronic Control Module; (LH front under battery), gasoline, 8.1L
- 2003 SUBURBAN / YUKON XL 2500: Electronic Control Module; (LH front under battery), 8.1L
- 2003 AVALANCHE 2500: Electronic Control Module; (LH front under battery)
- 2004 CORVETTE / CTS: Electronic Control Module; (RH engine compartment), ID 12581565
Replacing your faulty PCM is a straightforward process that can be done with basic hand tools. For the 2003 S10, Sonoma, and Blazer, the module is located in the right-hand (passenger side) front of the engine compartment. For most full-size trucks and vans, it’s found under the battery on the left-hand (driver side). Always disconnect the negative battery terminal before beginning any work. Once installed, reconnect the battery and your vehicle is ready to go, thanks to our pre-programming service.
Frequently Asked Questions
Do I need to have this module programmed?
No. We handle all the programming for you before we ship the part. Just provide your vehicle’s VIN at checkout, and it will arrive ready for a simple, plug-and-play installation.
Where is the PCM located on my 2003 Chevy S10?
On the 2003 S10, S15, Sonoma, Blazer, and Jimmy, the Powertrain Control Module is located in the engine compartment on the right-hand (passenger) side, near the firewall.
What is a VIN and why do you need it?
VIN stands for Vehicle Identification Number. It’s a unique 17-digit code for your specific vehicle. We use it to load the correct factory software and calibrations for your truck’s engine, transmission, and options, ensuring perfect operation.
Will I need to perform a security or CASE relearn procedure?
In most cases, our programming handles the security information, and no relearn is needed. However, some GM vehicles may require a Crankshaft Variation (CASE) relearn to clear a P1336 code. This procedure can be done with a capable bi-directional scan tool.
Is this a new part?
This is a high-quality, tested original equipment (OEM) part. Each unit undergoes a rigorous inspection and testing process to ensure it meets or exceeds all factory performance standards for reliability and longevity.