Programmed 2005 Blazer S10 PCM | 89017749 | VIN Flashed & Ready to Install

Restore Your GM Truck’s Core Performance and Reliability

Is your 2005 Blazer S10 or Jimmy S15 suddenly stalling, shifting erratically, or refusing to start? Are you staring at a persistent Check Engine Light that just won’t go away? Before you resign yourself to a costly and time-consuming trip to the dealership, consider the root cause. The Powertrain Control Module (PCM), the electronic brain of your vehicle, is often the culprit. When it fails, it can cause a cascade of frustrating and seemingly unrelated issues. In my 20+ years of diagnostics, I’ve seen failing PCMs mimic everything from a bad fuel pump to a faulty transmission.

This isn’t just a replacement part; it’s a direct solution. We take a genuine GM-spec PCM, part number 89017749, and professionally program it to your vehicle’s specific Vehicle Identification Number (VIN). This ensures that all factory settings for your engine and transmission are perfectly matched. We also load the latest GM software updates, which can resolve drivability issues you didn’t even know were software-related. This process eliminates the need for expensive programming tools or a tow to the dealer, getting your truck back on the road faster.

Is Your Vehicle Showing These Symptoms?

A failing PCM can manifest in many ways. If you’re experiencing any of the following, this module is the likely solution for your 2005 Blazer S10 PCM issues:

• ✔ Check Engine Light is on with codes like P0601, P0602, P0606 (Internal Control Module Memory Check Sum Error or Processor Fault).
• ✔ Engine stalls for no reason, idles roughly, or misfires.
• ✔ Complete no-start or no-crank condition.
• ✔ Harsh or erratic automatic transmission shifting.
• ✔ Poor fuel economy that has gotten progressively worse.
• ✔ Loss of communication with the scan tool (U-codes).
• ✔ Seemingly random electrical issues or warning lights.

A Straightforward Guide to Installation

Installing your new 2005 Blazer S10 PCM is a job most DIYers can handle in under an hour. This module is located in the right-front of the engine compartment.

1. Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
2. Locate the PCM: On the 2005 Blazer/Jimmy, find the module on the passenger side of the engine bay, near the firewall.
3. Disconnect Connectors: Carefully unclip and remove all electrical harness connectors from the old PCM. They have locking tabs, so be gentle to avoid breaking them.
4. Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
5. Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely tighten the bolts.
6. Reconnect Everything: Plug all electrical connectors firmly back into the new PCM until they click. Reconnect your negative battery terminal.
7. Perform Security Relearn: Your vehicle may require a simple key-cycle security relearn procedure to recognize the new PCM. This typically involves turning the key to ‘ON’ for 10 minutes, ‘OFF’ for 10 seconds, and repeating two more times. Your vehicle’s service manual will have the exact steps.

Will This Fit My Vehicle?

This module is a direct replacement for part numbers 89017749, 12589462, and 12602801. It is guaranteed to fit the following vehicles and configurations:

Frequently Asked Questions