Is Your 2005 Blazer or Jimmy Running Rough?
There’s nothing more frustrating than a vehicle you can’t rely on. If your 2005 Chevrolet Blazer S10 or GMC Jimmy S15 is experiencing baffling issues like stalling, erratic shifting, or a persistent Check Engine Light, the problem often points to a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM controls everything from fuel mixture and ignition timing to transmission shift points. When it fails, it can cause a cascade of problems that are often difficult to diagnose.
From the Diagnostic Bay
I remember a 2005 Jimmy S15 that came into my shop a few years back. The owner had been to two other garages for an intermittent no-start condition. All the usual suspects—battery, starter, fuel pump—checked out fine. After connecting my scan tool, I noticed communication with the PCM would drop out randomly. After verifying all power and ground circuits to the module were solid, we pinpointed the PCM itself. The internal processor was failing under thermal stress. A replacement, VIN-programmed module like this one had the truck starting reliably every single time, solving a problem that had stumped others for weeks.
The Direct-Fit, No-Hassle Solution
This isn’t just a replacement part; it’s a complete solution. We take the guesswork and high dealership costs out of the equation. Each 2005 Blazer S10 PCM is professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This ensures that it has the latest GM software updates for optimal performance and efficiency. It arrives ready to install, allowing you to get your truck back to factory-spec operation without needing a tow to the dealer for expensive programming.
Is Your PCM Failing? Watch for These Symptoms
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Diagnostic Trouble Codes (DTCs) related to internal module failure, such as P0601, P0602, or P0606.
- ✔ Unexplained stalling or engine hesitation.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A complete no-start condition where the engine cranks but won’t fire.
- ✔ Noticeable decrease in fuel economy.
- ✔ Failure to pass an emissions inspection.
Your Straightforward Installation Guide
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting work.
- ✔ Locate the PCM: On the 2005 Blazer S10 and Jimmy S15, the PCM is located in the engine compartment on the right-hand (passenger) side, typically near the firewall or inner fender.
- ✔ Disconnect the Connectors: Carefully release the locking tabs on the electrical harness connectors and pull them straight out from the old module. Inspect the connectors for any corrosion or damage.
- ✔ Remove the Old Module: Unbolt the PCM from its mounting bracket. There are usually two or three bolts holding it in place.
- ✔ Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely fasten the bolts.
- ✔ Reconnect Everything: Firmly plug the harness connectors back into the new PCM until they click into place. Reconnect the negative battery terminal.
- ✔ Final Step: In many cases, you may need to perform a security relearn procedure for the vehicle to start. This can typically be done without special tools by cycling the key in the ignition. Consult your owner’s manual or a reliable online resource for the specific procedure for your vehicle.
Guaranteed Vehicle Compatibility
This module is a direct replacement for part numbers 12589462, 12602801, and 89017749. It is guaranteed to fit the following vehicles and configurations:
ASTRO 05 Electronic Control Module; (LH front by battery)
SAFARI (GMC) 05 Electronic Control Module; (LH front by battery)
AVALANCHE 2500 05-06 Electronic Control Module; (LH front under battery)
CTS 04-05 Electronic Control Module; (RH engine compartment), V-Series, ID 12589462 or 12602801
EXPRESS/SAVANA 1500 VAN 05-07 Electronic Control Module; (LH rear engine compartment)
EXPRESS/SAVANA 2500 VAN 05-07 Electronic Control Module; (LH rear engine compartment), gasoline
EXPRESS/SAVANA 3500 VAN 05-07 Electronic Control Module; (LH rear engine compartment), gasoline
SIERRA/SILVERADO 1500 PICKUP 05-07 (Classic Style) Electronic Control Module; (LH front under battery), w/o hybrid, w/4.3L
SIERRA/SILVERADO 2500 PICKUP 05-07 (Classic Style) Electronic Control Module; (LH front under battery), gasoline, 8.1L
SIERRA/SILVERADO 3500 PICKUP 05-07 (Classic Style) Electronic Control Module; (LH front under battery), gasoline, 8.1L
SUBURBAN 2500 05-06 Electronic Control Module; (LH front under battery), 8.1L
YUKON XL 2500 05-06 Electronic Control Module; (LH front under battery), 8.1L
Frequently Asked Questions
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your 17-digit VIN. We cannot ship your order until we receive this information.
Is this part difficult to install for a DIYer?
No, this is a very straightforward replacement. It’s a plug-and-play module that requires only basic hand tools. The most critical part is providing the correct VIN and performing the security relearn procedure after installation.
Will this fix my specific problem?
This module corrects issues directly caused by a faulty PCM. While it resolves many common symptoms like no-start or specific internal fault codes (P0601), it’s important to ensure your vehicle’s problem has been properly diagnosed. This part will not fix issues caused by other faulty sensors or wiring.
What does ‘programmed with the newest updates’ mean?
Over the life of a vehicle, manufacturers like GM release software updates to improve drivability, fuel economy, and fix bugs. We flash your module with the latest official GM calibration available for your VIN, ensuring your vehicle runs better than ever.
Do I need to send my old PCM back?
No core charge or return is required for this part. You can keep or responsibly dispose of your old module.