Is Your 1998 GMC Safari Running Rough, Stalling, or Not Starting?
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 often the culprit. Over my 20+ years in the garage, I’ve seen countless GM vehicles from this era exhibit these exact symptoms. Often, mechanics might chase down sensors or even suspect a bad transmission, but the root cause is frequently the vehicle’s central computer.
This isn’t just a replacement part; it’s a complete, hassle-free solution. We are offering a genuine, used OEM Powertrain Control Module with service number 09355699. The critical difference is that we program it specifically for your vehicle using your VIN before it ever leaves our shop. This means it arrives at your door ready for a simple, plug-and-play installation, loaded with the latest GM software updates for optimal performance and reliability.
Why Choose a Pre-Programmed PCM?
- ✔ Eliminate Dealer Hassles: Skip the expensive trip to the dealership for programming. This module is ready to install right out of the box.
- ✔ Solve Common Issues: A direct fix for symptoms like harsh shifting, no-start conditions, random stalling, and false sensor codes.
- ✔ Latest GM Updates: We flash the module with the most current software from General Motors, ensuring it corrects known factory bugs and improves drivability.
- ✔ Guaranteed Compatibility: By using your VIN, we ensure a perfect match for your vehicle’s specific options and systems.
Expert Pro Tip from a 20-Year Technician
Before you plug in your new PCM, take a moment to inspect the vehicle’s harness connectors. On these late-90s GM trucks and vans, it’s common to find green or white corrosion on the pins, especially on the main power and ground circuits. This corrosion creates high resistance and can cause the same symptoms as a bad PCM, or even damage the replacement unit. Use a small wire brush and electrical contact cleaner to gently scrub the pins and sockets until they are bright and clean. This simple five-minute check can save you hours of diagnostic headaches.
Simple Plug-and-Play Installation Guide
You don’t need to be a master mechanic to install this part. The location on a 1998 GMC Safari is typically in the engine compartment, near the battery. Follow these simple steps:
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: Find the existing module in the engine bay. It’s a metal box with several large electrical connectors.
- Disconnect the Old Module: Carefully release the locking tabs on the electrical connectors and unplug them from the old PCM. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed PCM into place. Firmly reconnect the electrical connectors, ensuring they click and lock securely.
- Reconnect Power: Re-attach the negative battery terminal.
- Perform Security Relearn (If Necessary): In some cases, a simple security relearn procedure is needed. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Your vehicle’s manual will have the exact steps. Start the engine and enjoy your smooth-running Safari!
Guaranteed Fitment and Part Number Compatibility
This module is a direct replacement for service number 09355699. It is also a compatible replacement for the following part numbers: 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810. While this listing is for a 1998 GMC Safari PCM, this versatile module fits a wide range of GM trucks, vans, and SUVs from 1998-1999, including the Chevy Silverado, GMC Sierra, Tahoe, Yukon, Suburban, Express, Savana, and more. Please verify your original part number to ensure a perfect match.