Programmed 1998 GMC Safari PCM 09366810 Engine Computer

Is Your 1998 GMC Safari Running Rough?

If you’re dealing with a persistent check engine light, erratic engine behavior, or transmission shifting problems in your 1998 GMC Safari, a failing Powertrain Control Module (PCM) is a likely culprit. As the central computer of your vehicle, the PCM controls everything from fuel mixture and ignition timing to transmission shift points. When it malfunctions, it can cause a cascade of frustrating and difficult-to-diagnose issues. This is your direct-fit, reliable solution to get your van back on the road and running smoothly.

This is a quality, tested, used PCM sourced from a salvaged vehicle. We professionally program it with the latest official GM software, specifically matched to your vehicle’s VIN. This ensures compatibility and restores your vehicle’s original performance and efficiency.

Common Symptoms of a Failing PCM

• ✔ Persistent Check Engine Light (CEL) with communication-related codes (e.g., U-codes) or various sensor codes.
• ✔ Rough idling, stalling, or hesitation during acceleration.
• ✔ Noticeable decrease in fuel economy.
• ✔ Harsh, delayed, or incorrect automatic transmission shifting.
• ✔ Engine cranks but refuses to start (no-start condition).
• ✔ Failure to pass state emissions testing.
• ✔ Intermittent electrical issues that seem to have no other cause.

The Brain of Your Vehicle: The 1998 GMC Safari PCM

The 1998 GMC Safari PCM is more than just a simple component; it’s the command center for your entire powertrain. It constantly analyzes data from dozens of sensors—like the oxygen sensors, crankshaft position sensor, and throttle position sensor—to make real-time adjustments. This complex process ensures your engine and transmission work in harmony for optimal power, fuel efficiency, and low emissions. Because of this complexity and its integration with the vehicle’s anti-theft system (VATS/Passlock), you can’t simply swap a used computer from another vehicle. It requires precise VIN-specific programming to function correctly.

A Simple Solution: VIN-Programmed for Your Van

Our process eliminates the guesswork and the need for expensive dealership programming. When you place your order, simply provide us with your vehicle’s 17-digit VIN. Our technicians will then flash this PCM with the exact software calibration for your 1998 GMC Safari, accounting for its specific engine, transmission, and factory options. This makes the installation process as straightforward as possible.

This module is a direct replacement for several part numbers, including: 09355699, 16266645, 16250279, 16258815, 09366810, and 9366810. Please verify your original part number to ensure compatibility.

Installation and Security Relearn

After installing the new PCM, you will need to perform a security relearn procedure to sync the computer with your vehicle’s anti-theft system. This is a simple process that you can do yourself and does not require special tools.

1. Disconnect the battery before swapping the module.
2. Install the new PCM and reconnect the battery.
3. Turn the key to the “ON” position (do not start the engine). The security light should be on or flashing.
4. Leave the key in the “ON” position for approximately 10-12 minutes, or until the security light turns off.
5. Turn the key to “OFF” for 10 seconds.
6. Repeat steps 3-5 two more times for a total of three 10-minute cycles.
7. After the third cycle, the vehicle should start and run normally.

In some cases, a Crankshaft Position System Variation (CASE) relearn may be required with a capable scan tool to clear a P1336 code, but the vehicle will run and drive without it.