Restore Peak Performance to Your GM Truck or SUV
Is your truck or van suddenly stalling, running rough, or refusing to start? A faulty Powertrain Control Module (PCM) is often the culprit, acting like a confused brain for your vehicle’s engine and transmission. This can lead to frustrating diagnostic dead-ends and costly repair bills. This tested, OEM engine computer, part number 16250279, is the reliable and affordable solution to get your vehicle back on the road with confidence. We take the guesswork and high dealership costs out of the equation by programming the module specifically to your vehicle’s VIN before it ships.
As a technician with over two decades of experience, I’ve seen countless GM vehicles from this era sidelined by PCM failure. The symptoms can be intermittent and maddening, but the fix doesn’t have to be. By providing a unit that’s pre-loaded with the latest GM software updates for your exact vehicle, we eliminate the need for expensive programming tools or a trip to the dealer. This is a direct-fit replacement for your original 1998 Envoy PCM and a wide range of other GM models, designed to restore factory performance and fuel efficiency.
From the Diagnostic Bay
I remember a 1998 GMC Jimmy that came into the shop on a tow truck. The owner said it would run fine for a week, then suddenly die at a stoplight and refuse to restart for hours. There were no consistent trouble codes, just a loss of communication with the scan tool when the fault occurred. After checking all the power and ground circuits to the PCM, we suspected the module itself. On a hunch, I used a heat gun on the original PCM, and sure enough, the engine stalled and wouldn’t restart. These black box PCMs are notorious for developing internal solder joint fractures that separate when hot. We installed one of our VIN-programmed modules, performed the security relearn, and the truck ran perfectly, hot or cold. It’s a classic failure this part is designed to solve.
Common Signs of a Failing GM PCM
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or other communication faults.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling, especially after the engine has warmed up.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Noticeable decrease in fuel economy.
- ✔ Communication errors with your diagnostic scan tool.
- ✔ Misfire codes (like P0300) that aren’t caused by plugs, wires, or coils.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery.
- ✔ Locate the PCM: On most of these trucks and vans, the PCM is located in the engine compartment, often on the driver’s or passenger’s side fender well or near the battery.
- ✔ Disconnect Connectors: Carefully unclip and remove the wiring harness connectors from the old module. Inspect them for any corrosion or damage.
- ✔ Remove Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- ✔ Install New Module: Bolt the new, programmed PCM into place and securely reconnect the wiring harnesses.
- ✔ Reconnect Battery: Reattach the negative battery terminal.
- ✔ Perform Security Relearn: You will likely need to perform a simple security relearn procedure (often called Passlock relearn) to sync the new PCM with your vehicle’s anti-theft system. This typically involves turning the key to the ‘ON’ position for 10-15 minutes.
Verified Vehicle Compatibility
This module is a direct replacement for service number 16250279 and is compatible with other part numbers including 09355699, 16266645, 16258815, and 09366810. It fits a wide variety of GM vehicles. Please match your part number or confirm your vehicle is on the list below. This is a partial list based on the common ID 9355699:
- Astro/Safari Van (1998)
- Blazer S10/Jimmy S15 (1998)
- Bravada (1998)
- Cadillac Escalade (1999)
- Chevrolet/GMC C/K 1500, 2500, 3500 Pickups (1998-1999)
- Chevrolet/GMC Suburban (1998-1999)
- Envoy (1998)
- Express/Savana 1500, 2500, 3500 Vans (1998-1999)
- Isuzu Hombre (1998)
- S10/S15/Sonoma Pickup (1998)
- Tahoe/Yukon (1998-1999)
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your vehicle’s 17-digit VIN. We cannot ship the module until we have this information to ensure it is correctly programmed for your specific vehicle.
Is this part new?
No, this is a high-quality, tested OEM part carefully sourced from a salvaged vehicle. Each unit is inspected and verified to be fully functional before being programmed and shipped.
Will I need to do anything after I install it?
Yes. After installation, you will need to perform a security relearn procedure. This is a simple process that syncs the new PCM to your vehicle’s anti-theft system and does not require special tools. A quick search for your vehicle’s ‘Passlock relearn procedure’ will provide easy-to-follow instructions.
What’s the benefit of getting a pre-programmed module?
Getting a pre-programmed module saves you significant time and money. You avoid a trip to the dealership and their associated programming fees, which can often be several hundred dollars. It arrives ready for installation and the final security relearn step.
How do I confirm this is the right part?
The best way is to match the service number (e.g., 16250279 or 09355699) from your original PCM to the numbers listed in our description. If you are unsure, send us a message with your VIN and we’ll be happy to verify compatibility for you.