Restore Peak Performance and Drive with Confidence
Is your trusty GM truck or SUV starting to show its age with frustrating issues like a persistent check engine light, erratic shifting, or a rough idle? These are classic signs that the brain of your vehicle, the Powertrain Control Module (PCM), is failing. Don’t let a faulty computer keep you off the road. This direct-fit replacement PCM, part number 16250279, is the reliable, straightforward solution to bring back the smooth, dependable performance you remember. We take the guesswork out of the repair by pre-programming the module to your vehicle’s specific VIN, ensuring a seamless installation and immediate results.
Warning Signs and How to Overcome Them
A failing PCM can cause a cascade of confusing problems. If you’re experiencing any of the following, this module is your solution:
- ✔ Persistent Check Engine Light: Often with diagnostic trouble codes (DTCs) like P0601, P0602, P0605, or P0606 pointing to an internal module failure.
- ✔ Erratic Transmission Behavior: Harsh shifting, getting stuck in gear, or delayed engagement are common symptoms controlled by the PCM.
- ✔ Poor Engine Performance: Noticeable loss of power, terrible fuel economy, stalling, or a rough, inconsistent idle.
- ✔ No-Start Condition: In severe cases, the PCM can fail completely, preventing the engine from starting at all, even with a good battery and starter.
- ✔ Communication Errors: Your mechanic’s scan tool may be unable to communicate with the engine computer.
An Expert’s Note: The Dealership Alternative
I once had a customer with a ’99 Tahoe who was quoted over a thousand dollars by the dealership for a new PCM and programming. His truck barely ran, and he was ready to give up on it. We sent him one of these pre-programmed modules. He called back a few days later, ecstatic. With a few basic tools and our simple instructions, he had his beloved Tahoe running like new in his own driveway. It’s not just about saving money; it’s about the satisfaction of fixing it yourself and regaining control over your vehicle. That’s the confidence we deliver in every box.
Guided Installation to Restore Peace of Mind
Replacing your 1998 Blazer S10 PCM is a manageable job for any DIYer. Our goal is to make this process as smooth as possible. Follow these steps for a successful installation:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to ensure the system is fully discharged.
- Locate the Old Module: On most S-10 Blazers and Jimmys, the PCM is located in the engine bay on the front passenger side, near the firewall or inner fender. For full-size trucks and vans, it’s typically on the driver’s side inner fender, near the battery.
- Disconnect the Harnesses: Carefully unplug the electrical connectors from the old module. There are typically multiple color-coded harnesses with locking tabs. Be gentle to avoid damaging the pins or clips.
- Swap the Modules: Unbolt the old PCM from its mounting bracket and set it aside. Mount your new, pre-programmed module securely in its place.
- Reconnect Everything: Firmly plug the wiring harnesses into the new PCM. You should hear a click as they lock into place. Reconnect the negative battery terminal.
- Perform Security Relearn (If Needed): After installation, your vehicle may require a simple security relearn procedure to recognize the new PCM. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine. This ensures your anti-theft system syncs correctly.
Tailored Fit for Your GM Vehicle
This module is the correct, pre-programmed solution for a wide range of GM models. Please verify your part number (16250279, 09366810, or 09355699) and check the list below to ensure compatibility.
GMC 1500 PICKUP 99 Electronic Control Module; 5.7L, (LH engine compartment), ID 16250279
GMC 2500 PICKUP 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 16250279
SAFARI (GMC) 98-99 Electronic Control Module; (LH front by battery), ID 16250279
ENVOY 98 Electronic Control Module; (RH front engine compartment), w/o build date opt ZN4; ID 16258815
YUKON 98-99 Electronic Control Module; (LH engine compartment), ID 16250279
GMC 1500 PICKUP 98 Electronic Control Module; gasoline (LH front engine compartment), ID 16250279
GMC 1500 PICKUP 99 Electronic Control Module; 5.0L, (LH engine compartment), ID 16250279
BRAVADA 98 Electronic Control Module; (6-262, 4.3L), w/o build date opt ZN4; ID 16250279
EXPRESS 3500 VAN 98 Electronic Control Module; gasoline, ID 16250279
EXPRESS 2500 VAN 98 Electronic Control Module; gasoline, ID 16250279
ASTRO 99 Electronic Control Module; (LH front by battery), (4.3L), ID 16250279
BLAZER S10/JIMMY S15 98 Electronic Control Module; (RH front engine compartment), w/o build date opt ZN4; ID 16250279
CHEVROLET 1500 PICKUP 99 Electronic Control Module; 5.0L, (LH engine compartment), ID 16250279
CHEVROLET 1500 PICKUP 99 Electronic Control Module; 5.7L, (LH engine compartment), ID 16250279
ISUZU HOMBRE 98 Electronic Control Module; 4.3L (6 cylinder), w/o extended build date opt ZN4; ID 16258815
S10/S15/SONOMA 98 Electronic Control Module; 6-262 (4.3L), w/o build date opt ZN4; ID 16250279
S10/S15/SONOMA 98 Electronic Control Module; 6-262 (4.3L), w/o build date opt ZN4; ID 16258815
EXPRESS 1500 VAN 98 Electronic Control Module; ID 16250279
SAVANA 2500 VAN 98 Electronic Control Module; gasoline, ID 16250279
BLAZER S10/JIMMY S15 98 Electronic Control Module; (RH front engine compartment), w/o build date opt ZN4; ID 16258815
CHEVROLET 2500 PICKUP 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 16250279
SAVANA 3500 VAN 98 Electronic Control Module; gasoline, ID 16250279
SUBURBAN 1500 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 16250279
TAHOE 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 16250279
ASTRO 98 Electronic Control Module; (LH front by battery), ID 16250279
BRAVADA 98 Electronic Control Module; (6-262, 4.3L), w/o build date opt ZN4; ID 16258815
SUBURBAN 2500 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 16250279
ISUZU HOMBRE 98 Electronic Control Module; 4.3L (6 cylinder), w/o extended build date opt ZN4; ID 16250279
SAVANA 1500 VAN 98 Electronic Control Module; ID 16250279
CHEVROLET 1500 PICKUP 98 Electronic Control Module; gasoline (LH front engine compartment), ID 16250279
CHEVROLET 3500 PICKUP 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 16250279
ENVOY 98 Electronic Control Module; (RH front engine compartment), w/o build date opt ZN4; ID 16250279
GMC 3500 PICKUP 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 16250279
By choosing this programmed 1998 Blazer S10 PCM, you’re not just buying a part; you’re investing in a lasting repair that restores your vehicle’s reliability and your peace of mind.
Frequently Asked Questions
What does ‘pre-programmed’ mean for me?
It means we handle the complicated part for you. Using the VIN you provide, we load the latest GM-certified software specific to your vehicle’s make, model, engine, and options. This eliminates the need for an expensive trip to the dealership for programming after installation.
Do I need to do anything after installing the PCM?
In many cases, you will need to perform a simple security relearn procedure, also known as a Passlock relearn. This syncs the new PCM with your vehicle’s anti-theft system and can be done without any special tools. Instructions are readily available online or we can help guide you. Some vehicles may also require a Crankshaft Position Sensor (CASE) relearn, which requires a capable scan tool.
Where is the PCM located on my 1998 S10 Blazer?
On the 1998 S10 Blazer, Jimmy S15, Sonoma, and Bravada, the PCM is typically found in the engine compartment, mounted on the passenger side (RH) inner fender or firewall.
Will this computer fix my transmission shifting problems?
Yes, in many cases it will. The PCM controls both engine functions and transmission shift points. If your transmission issues are electronic and caused by a failing module, this part is the correct solution. It will not fix internal mechanical failures within the transmission itself.
How do I provide my VIN number?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship your part until we receive this information, as the programming is essential for it to function in your vehicle.