Restore Peak Performance to Your GM Truck or Van
Is your 1998-1999 Chevrolet Express 1500, GMC Savana, or other compatible GM vehicle suffering from frustrating engine issues? Symptoms like a persistent check engine light, rough idling, stalling, poor fuel mileage, or a complete no-start condition often point to a failing Powertrain Control Module (PCM). As the central computer, the PCM is responsible for managing critical engine and transmission functions. When it fails, your vehicle’s reliability and performance suffer dramatically.
This is a genuine, used GM Electronic Control Module, part number 16266645, that has been carefully tested and is ready for service. We take the guesswork and high cost out of the repair process. Before shipping, we will program the module with the latest official GM software updates, specifically calibrated to your vehicle’s unique Vehicle Identification Number (VIN). This ensures a seamless, plug-and-play installation without the need for an expensive trip to the dealership for programming.
Expert Pro Tip
Expert Pro Tip
Before you replace your PCM, take a moment to inspect the main electrical connections and grounding points. On these GM vans and trucks, a corroded or loose ground wire (especially the one from the engine block to the chassis) can cause erratic behavior that mimics a faulty computer. A simple cleaning with a wire brush could save you time and money.
Common Signs of a Failing GM PCM
- ✔ Persistent Check Engine Light (CEL) with communication-related trouble codes (e.g., U-codes).
- ✔ Engine stalls unexpectedly or is difficult to start.
- ✔ Noticeable decrease in fuel economy.
- ✔ Rough or unstable engine idle.
- ✔ Harsh, delayed, or incorrect transmission shifting.
- ✔ The vehicle’s anti-theft system (Passlock/VATS) may prevent starting.
- ✔ Failure to pass emissions testing.
Why Choose Our Programmed 1998-1999 Express 1500 PCM?
Getting your truck or van back on the road shouldn’t be complicated. Our process is designed to be straightforward and effective. This module is a direct replacement for a wide range of popular GM vehicles from 1998 and 1999, including the Chevy Tahoe, GMC Yukon, Suburban, and various pickups. By providing us with your VIN during checkout, you receive a module that is precisely matched to your vehicle’s original factory specifications, including engine size, transmission type, and emissions equipment. This VIN-specific programming is critical for proper operation of all vehicle systems. This reliable, tested 1998-1999 Express 1500 PCM is the most efficient solution to get your vehicle running correctly again.
Simple Installation Process
Once you receive your pre-programmed module, the installation is straightforward. Simply disconnect the battery, locate and remove your old PCM, and install the new one. After reconnecting the battery, you may need to perform a simple security relearn procedure, which can typically be done without special tools. This ensures the new computer communicates correctly with your vehicle’s anti-theft system. Instructions for this procedure are widely available and easy to follow.
Frequently Asked Questions
Expert Pro Tip
Before you replace your PCM, take a moment to inspect the main electrical connections and grounding points. On these GM vans and trucks, a corroded or loose ground wire (especially the one from the engine block to the chassis) can cause erratic behavior that mimics a faulty computer. A simple cleaning with a wire brush could save you time and money.