Restore Peak Performance to Your GM Truck or Van
Is your 1998-1999 Chevrolet Express 3500, or another compatible GM vehicle, suffering from perplexing issues like a persistent check engine light, poor fuel economy, erratic shifting, or a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. Don’t let a faulty computer keep you off the road. This replacement PCM, part number 16250279, is the reliable and cost-effective solution to get your vehicle running smoothly again.
This isn’t just a generic, off-the-shelf part. We take a genuine, used OEM module and professionally program it specifically for your vehicle. Before we ship, we flash it with the latest official GM software updates using your vehicle’s unique Vehicle Identification Number (VIN). This critical step ensures that the computer communicates flawlessly with your engine, transmission, and all other onboard systems, just as the factory intended. You get a direct-fit component that is ready for installation, eliminating guesswork and compatibility problems.
From the Diagnostic Bay
We had a 1999 Chevy Suburban come into the shop with a complaint of a harsh 1-2 shift and an intermittent stall at stoplights. The customer had already replaced the transmission fluid, filter, and even a shift solenoid with no improvement. Diagnostic codes were all over the place, pointing to multiple sensors. After checking the wiring harness for damage, we suspected the PCM. A failing computer can send out bad signals, making good sensors look faulty. We installed a VIN-programmed PCM like this one, performed the security relearn, and the truck drove like new. It’s a powerful reminder that the PCM is the foundation of the entire powertrain system, and when it fails, it can create a cascade of confusing symptoms.
Is Your Vehicle Showing Signs of PCM Failure?
A failing PCM can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following, your engine computer could be the culprit:
- ✔ Check Engine Light: The light is on, and you may have error codes that are inconsistent or point to multiple unrelated sensors (e.g., P0171, P0300, P0601, P0606).
- ✔ Engine Performance Issues: Noticeable loss of power, rough idling, engine stalling, hesitation during acceleration, or a decrease in fuel efficiency.
- ✔ Transmission Problems: Harsh or delayed shifting, getting stuck in a single gear (limp mode), or failure to shift at all.
- ✔ No-Start Condition: The engine cranks but refuses to start, or it starts and immediately dies. This can happen if the PCM isn’t properly controlling fuel delivery or ignition timing.
- ✔ Failed Emissions Test: The PCM plays a vital role in managing the vehicle’s emissions systems. A faulty unit can prevent you from passing an inspection.
The Right Solution: A Programmed 1998-1999 Express 3500 PCM
Choosing the right replacement is crucial. This module is a tested, used OEM part sourced from a salvaged vehicle, providing the durability and reliability of a factory component at a fraction of the cost of a new one. The key to our service is the VIN-specific programming. By flashing the module to your exact vehicle, we ensure it has the correct calibration files for your engine, transmission, and specific options. This eliminates the need for expensive trips to the dealership for programming after installation.
Installation Note: Upon installing this PCM, you may need to perform a security relearn procedure (often called a CASE relearn or Passlock relearn). This procedure syncs the new computer with your vehicle’s anti-theft system and crankshaft position sensor. It is a straightforward process that can typically be done without special tools and instructions can be readily found online for your specific model.
Guaranteed Fitment for a Wide Range of GM Vehicles
This Electronic Control Module is a direct replacement for service numbers 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810. It fits dozens of models from 1998-1999, including the Chevrolet Express, GMC Savana, Chevrolet and GMC Pickups (1500, 2500, 3500), Tahoe, Suburban, Yukon, Cadillac Escalade, and more. Please verify your part number and consult the detailed fitment list to confirm compatibility with your specific vehicle and options.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential because it allows us to load the exact, correct software and calibration files from GM for your vehicle’s specific engine, transmission, and factory options. This ensures perfect compatibility and optimal performance, preventing a host of potential issues.
Is this part difficult to install?
Physically replacing the PCM is generally straightforward. It’s typically located in the engine bay and held in place by a few bolts with electrical connectors. The most important step after installation is the security relearn procedure, which syncs the computer to your vehicle. This can usually be done by the owner following a simple key-on/key-off sequence.
What does ‘used’ mean for this part?
This is a genuine, original equipment (OEM) computer that has been carefully removed from a salvaged vehicle. It is not an aftermarket part. We inspect these units to ensure they are functional before programming them for sale. This is a reliable and economical way to get an authentic GM part.
Will this fix my check engine light?
If the check engine light and associated codes are being caused by a faulty PCM, then yes, this replacement part will solve the problem. However, it’s crucial to ensure your vehicle’s issues have been properly diagnosed, as the check engine light can also be triggered by faulty sensors, wiring, or other mechanical problems.
Do I need to do anything after I order?
Yes. After you place your order, you must provide us with your 17-digit VIN. We cannot program and ship your PCM without it. Please send us a message with your VIN immediately after purchase to avoid any delays in processing your order.