Is Your 2003 Blazer or Jimmy Suddenly Unreliable?
If you’re dealing with frustrating issues like stalling at stoplights, a persistent check engine light that won’t go away, harsh shifting, or a no-start condition that leaves you stranded, the problem often points directly to a failing Powertrain Control Module (PCM). As the brain of your vehicle, when the PCM starts to fail, it can create a cascade of confusing and intermittent problems that are a headache to diagnose. You need a solution that’s not just a replacement part, but a complete restoration of your vehicle’s core logic.
Expert Pro Tip: Check Your Connectors First!
Before you condemn your old PCM, take a moment to inspect the large electrical connectors that plug into it. Over two decades, moisture and engine bay heat can cause corrosion on the pins or make the plastic brittle. I’ve seen cases where simply cleaning the terminals with a good quality electronics cleaner and a small brush restored the connection and solved the problem. It’s a 5-minute check that can save you time and confirm you’re replacing the right part.
A True Plug-and-Play Solution for Your 2003 Blazer S10 PCM
This isn’t just a generic, off-the-shelf computer. This is a fully programmed Powertrain Control Module specifically prepared for your vehicle. We take your vehicle’s unique 17-digit Vehicle Identification Number (VIN) and flash this module with the latest, most stable software updates directly from GM. This critical step ensures that the PCM communicates perfectly with your engine, transmission, and all other onboard systems, just as it did the day it left the factory.
- โ Eliminate Guesswork: Solves common issues like random stalling, poor fuel economy, and erratic engine behavior.
- โ No Dealer Programming Needed: This module arrives ready for installation. Simply plug it in, perform the security relearn procedure, and you’re back on the road. This saves you hundreds in dealership fees and towing costs.
- โ Latest GM Software: We load the most current calibrations, which often include fixes for drivability issues and bugs that were discovered after your truck was built.
- โ Restored Performance: Get back the smooth shifting, correct fuel mixture, and reliable starting you depend on.
Simple DIY Installation: Get Back on the Road Fast
Installing your new PCM is straightforward and can typically be done in under an hour with basic hand tools. For the 2003 Blazer S10 and Jimmy S15, the module is located in the right-front of the engine compartment.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: Find the module on the right side of the engine bay. It will have several large wiring harnesses connected to it.
- Disconnect Harnesses: Carefully unclip and remove all electrical connectors from the old PCM. Inspect them for any dirt or corrosion.
- Remove Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install New Module: Bolt the new, pre-programmed PCM into place and securely reconnect all wiring harnesses.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: You will need to perform a simple key-cycle procedure (instructions included) to sync the new PCM with your vehicle’s anti-theft system. This takes about 30 minutes and requires no special tools.
Guaranteed Compatibility
This module is a direct replacement for part number 12576106 and is also compatible with a wide range of other GM service numbers. Please verify your part number or consult the fitment list below to ensure this is the correct component for your truck or van. It is compatible with the following service numbers: 12581565, 8125815650, 12570557, 12570558, 12576869, 12578127, 8125781270, 88864822, and 89017733.