Restore Your Vehicle’s Performance with a VIN-Programmed PCM

If you’re dealing with frustrating engine problems on your 1998 Chevrolet Express 3500 Van, like stalling, poor fuel mileage, or a persistent check engine light, a failing Powertrain Control Module (PCM) is often the culprit. As the brain of your vehicle, the PCM controls everything from fuel injection and ignition timing to transmission shifting. When it fails, it can cause a wide range of confusing and costly issues. This replacement module is the reliable, straightforward solution to get your truck or van running like it should.

We take the guesswork and hassle out of the repair. Unlike a generic module from a parts store, this unit arrives at your door fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We install the latest GM factory software updates, which can resolve underlying drivability issues you might not even know were software-related. This means no expensive trip to the dealership for programming—just install the module, perform the security relearn procedure, and you’re back in business.

Is Your GM Vehicle Showing These Symptoms?

A failing PCM can manifest in many ways. If you’re experiencing any of the following, this module is likely the solution you need.

• ✔ Check Engine Light is on with codes for internal module failure (like P0601, P0605, P0606) or communication errors.
• ✔ The engine cranks but refuses to start.
• ✔ Unexplained drops in fuel economy.
• ✔ Harsh or erratic automatic transmission shifting.
• ✔ The vehicle stalls for no apparent reason, either while driving or at idle.
• ✔ Failure to pass an emissions test.

Your Straightforward Guide to Installation

Installing your new PCM is a job most DIYers can handle in their own driveway. While the exact location varies slightly by model, the process is generally the same.

1. Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
2. Locate the PCM: On most of these GM trucks and vans, the PCM is located in the engine compartment, typically on the driver’s or passenger’s side fender well or near the battery.
3. Disconnect the Connectors: Carefully unclip and remove the large electrical harness connectors from the old module. They have locking tabs that need to be released. Avoid pulling on the wires themselves.
4. Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
5. Install the New Module: Bolt your new, pre-programmed PCM into the mounting bracket.
6. Reconnect Everything: Firmly plug the electrical connectors into the new module until they click and lock into place. Reconnect the negative battery terminal.
7. Perform Security Relearn: You will need to perform a simple security relearn procedure (often called a Passlock or VATS relearn) so the vehicle recognizes the new PCM. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. Your vehicle’s specific procedure is readily available online.

Verified Vehicle Compatibility List

This module is a direct replacement for service number 16250279 and is also compatible with 09366810 and 09355699. Please match this number on your original part to ensure compatibility for the following vehicles:

Frequently Asked Questions