Get Your 1998 GMC Safari Running Right Again
Is your trusty 1998 GMC Safari van giving you headaches? Unexplained stalling, rough idling, poor fuel economy, or a persistent Check Engine Light can often point to one culprit: a failing Powertrain Control Module (PCM). As the brain of your vehicle, when the PCM starts to falter, it can cause a cascade of frustrating and hard-to-diagnose issues. This isn’t just an inconvenience; it affects your van’s reliability and safety. Stop chasing symptoms and address the root cause with a reliable, pre-programmed replacement PCM.
This is a quality used OEM Electronic Control Module that has been meticulously tested and is ready for installation. The real value is in our expert programming service. Before we ship it, we flash the module with the latest GM-certified software updates, tailored specifically to your vehicle’s VIN. This ensures perfect communication between the engine, transmission, and other systems, restoring the smooth performance you expect from your GMC. This is the most straightforward and cost-effective way to solve complex electronic issues without an expensive trip to the dealership.
A Technician’s Notebook
I remember a 1998 Astro van (a sibling to the Safari) that came into my bay with a bizarre intermittent no-start condition. The owner had already replaced the battery, starter, and fuel pump. After cranking, it would sometimes fire up perfectly, other times it was completely dead. No consistent codes were stored, just a random U-code for lost communication every so often. After checking all the grounds and power feeds to the PCM, we decided to swap in a test unit. The problem vanished instantly. The original PCM had an internal intermittent failure on the processor board that only acted up when cold. This is a classic scenario I’ve seen dozens of times on these GM platforms, and a properly programmed replacement is the definitive fix.
Is Your Van Showing These Symptoms?
A failing computer can manifest in many ways. If you’re experiencing any of the following, a faulty PCM is a likely cause:
- âś” Check Engine Light is on with codes like P0601, P0602, or P0605 (Internal Control Module Errors)
- âś” Engine cranks but refuses to start
- âś” Intermittent stalling or cutting out while driving
- âś” Harsh or erratic automatic transmission shifting
- âś” Noticeable decrease in fuel mileage
- âś” Failure to pass an emissions or smog test
- âś” Communication errors with diagnostic scan tools
A Straightforward Guide to Installation
Replacing the PCM on your Safari is a manageable job for a DIYer. Since we handle the programming, you won’t need any special scan tools for the installation itself. Just follow these steps:
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
- Locate the PCM: On the 1998 GMC Safari, the PCM is typically located in the engine compartment on the driver’s side, near the battery.
- Disconnect the Harnesses: Carefully unclip and remove the electrical wiring harnesses connected to the old module. These connectors have locking tabs that need to be released before pulling.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware as you will need it for the new unit.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and secure it with the original bolts.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new PCM. You should hear a ‘click’ as they lock into place. Reconnect the negative battery terminal.
- Perform Security Relearn (If Necessary): In many cases, you may need to perform a simple key-cycle security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine. Consult a service manual for your specific vehicle’s procedure.
Verified Vehicle Compatibility
This module, identified by service number 9355699, is a direct replacement for part number 16250279 and is also compatible with several other part numbers. It is guaranteed to fit the following vehicles:
GMC:
- 1998 Safari (by battery)
- 1998-1999 Savana 1500/2500/3500 Van (Gasoline)
- 1998-1999 C/K 1500/2500/3500 Pickup (Gasoline)
- 1998-1999 Suburban 1500/2500 (Gasoline)
- 1998-1999 Yukon
- 1998 S15 Sonoma (4.3L)
- 1998 Jimmy S15 (4.3L)
- 1998 Envoy (4.3L)
Chevrolet:
- 1998 Astro (by battery)
- 1998-1999 Express 1500/2500/3500 Van (Gasoline)
- 1998-1999 C/K 1500/2500/3500 Pickup (Gasoline)
- 1998-1999 Suburban 1500/2500 (Gasoline)
- 1998-1999 Tahoe
- 1998 S10 (4.3L)
- 1998 Blazer S10 (4.3L)
Cadillac:
- 1999 Escalade
Oldsmobile:
- 1998 Bravada (4.3L)
Isuzu:
- 1998 Hombre (4.3L)
Note: Always verify your original part number matches one of the compatible numbers (09355699, 16266645, 16250279, 16258815, 09366810) to ensure perfect fitment.
Frequently Asked Questions
How does the VIN programming work?
After you place your order, simply send us your vehicle’s 17-digit VIN. Our technicians will use it to load the correct, updated GM software onto the module before shipping. This makes the unit plug-and-play for your specific vehicle.
Is this a new part?
No, this is a high-quality, tested used OEM part sourced from a salvaged vehicle. This provides OEM reliability at a fraction of the cost of a new dealership part.
Will I need to do anything else after installation?
Because we pre-program the module, you will not need a dealer-level scan tool. However, on many GM vehicles of this era, you may need to perform a simple ‘Security Relearn’ procedure, which involves a series of key cycles. This syncs the module with your vehicle’s anti-theft system.
How do I find my original part number?
The part number is printed on a sticker on the case of your current PCM. You will need to locate and remove the module to read it. Match this number to our list to confirm compatibility.
What if this doesn’t fix my problem?
While this PCM is a common solution for many electronic issues, we always recommend proper diagnostics. Ensure you have checked all related wiring, grounds, and sensors. We guarantee the module is functional and programmed correctly upon arrival.