Restore Peak Performance to Your GM Truck or SUV
Is your trusty 1998 GMC Envoy, Chevy truck, or Suburban suddenly stalling, running rough, or refusing to start? Before you spend a fortune at the dealership, consider the heart of your vehicle’s operating system: the Powertrain Control Module (PCM). A failing PCM can cause a cascade of frustrating and hard-to-diagnose issues. This reliable, tested OEM engine computer, part number 16258815, is your direct-fit, cost-effective solution to get back on the road with confidence.
The biggest challenge with replacing a PCM isn’t the physical installation; it’s the programming. Without it, the vehicle won’t run. We solve that problem for you. Upon purchase, simply provide us with your vehicle’s VIN, and our technicians will program this module with the latest GM software specific to your vehicle. This ensures seamless communication between the engine, transmission, and other onboard systems, restoring the smooth operation you depend on.
A Technician’s Notebook: The Intermittent Stall Mystery
I remember a 1999 Chevy Suburban that came into my bay with a complaint that stumped two other shops: it would stall randomly at red lights, but only when warm. No consistent codes were stored, just a history of random misfires. The owner had already replaced the fuel pump and ignition coil. After hooking up my scan tool and monitoring live data, I noticed the PCM voltage would momentarily dip just before a stall. On these older GM trucks, heat soak and age can cause internal solder joints in the PCM to fail, creating intermittent open circuits. A replacement VIN-programmed PCM like this one solved the problem instantly. It’s often the last part people suspect, but the first part that should be checked for these symptoms.
Is Your GM Truck or Van Showing These Signs?
A faulty PCM can manifest in many ways. If you’re experiencing any of the following, this module is likely the solution you need.
- âś” Check Engine Light is on with PCM-specific Diagnostic Trouble Codes (DTCs) like P0601, P0602, P0604, or P0606.
- âś” The engine cranks but will not start.
- âś” Unexplained drops in fuel economy.
- âś” Harsh or erratic automatic transmission shifting.
- âś” Intermittent stalling or rough idling.
- âś” Failure to pass an emissions test.
- âś” Loss of communication with the scan tool.
A Straightforward Guide to Installation
Installing your pre-programmed PCM is a job most DIYers can handle in under an hour with basic hand tools. This avoids a costly trip to the mechanic for installation and programming.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
- Locate the PCM: On most compatible vehicles (like the Envoy, Blazer, S10), the PCM is located in the engine bay, often on the passenger (RH) side fender wall. On full-size trucks and vans, it’s typically on the driver’s (LH) side inner fender.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old PCM. They have locking tabs that may need to be gently pried up. Note their color and orientation.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed PCM into place. Reconnect the wiring harnesses, ensuring they click securely into position.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn (If Needed): Some GM vehicles require a simple security relearn procedure. Turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds. Repeat this cycle 3 times. The vehicle should then start and run normally.
Verified Vehicle Compatibility
This module is a direct replacement for service number 16258815 and is interchangeable with several other part numbers, including 09355699, 16266645, 16250279, and 09366810. It is critical to match the ID number 09355699 for proper function. This part fits a wide range of popular 1998 and 1999 GM models, including:
- âś” 1998 GMC Envoy
- âś” 1998-1999 Chevrolet & GMC Pickups (1500, 2500, 3500)
- âś” 1998-1999 Chevrolet Suburban & Tahoe
- âś” 1998-1999 GMC Yukon
- âś” 1998-1999 Chevrolet Express & GMC Savana Vans (1500, 2500, 3500)
- âś” 1998 Chevrolet Astro & GMC Safari
- âś” 1998 Oldsmobile Bravada
- âś” 1998 Chevrolet S10 / GMC Sonoma
- âś” 1998 Chevrolet Blazer / GMC Jimmy S15
- âś” 1998 Isuzu Hombre
Please verify the ID number on your original module to ensure perfect compatibility.
Frequently Asked Questions
What is VIN programming and why is it necessary?
VIN programming loads your vehicle’s unique identification number and specific operational software onto the PCM. This is crucial for ensuring the engine, transmission, anti-theft system, and gauges all function correctly together. We handle this for you before shipping.
Is this part difficult to install for a DIYer?
Not at all. Because we pre-program the module, the physical swap is very straightforward. It typically involves disconnecting the battery, unplugging a few connectors, and unbolting the old unit. Most people with basic tools can do it in their driveway.
Will this fix my check engine light?
If the check engine light is on due to an internal PCM failure (like code P0601), then yes, this part will resolve the issue. However, if the light is on for another reason (e.g., a bad oxygen sensor), that separate issue will still need to be addressed.
What if my original part number is slightly different?
This module replaces several part numbers. The most important identifier is the service ID, which for this group of vehicles is typically 09355699. As long as your vehicle is on the compatibility list and your ID matches, this part will work.
How do I provide my VIN after I order?
After you complete your purchase, you will receive instructions on how to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information for programming.