Is Your 1998 GMC Safari Running Rough, Stalling, or Refusing to Start?
As a mechanic with over two decades of experience, I’ve seen countless reliable GM vans and trucks like your Safari sidelined by a failing Powertrain Control Module (PCM). The symptoms can be maddening: a persistent Check Engine Light, erratic shifting, terrible fuel mileage, or a no-start condition that leaves you stranded. You’ve likely checked the basics, but the root cause is often the vehicle’s electronic brain.
This isn’t just a replacement part; it’s a direct solution. This is a tested, used OEM Engine Computer, part number 9355699, that we program specifically to your vehicle’s VIN. This ensures all factory settings and communication protocols are perfectly matched to your Safari, restoring its original performance and reliability.
Why Choose Our Programmed 1998 GMC Safari PCM?
Forget the exorbitant costs and scheduling hassles of a dealership visit. We handle the complex programming for you. Simply provide your VIN after purchase, and we’ll flash the module with the latest official GM software updates before it even leaves our facility. This process corrects common factory bugs and optimizes performance beyond what your original module could offer.
Expert Pro Tip: A Real-World Diagnosis
A customer’s ’98 Astro van (which uses the same PCM as your Safari) came into my shop last month with a random, intermittent misfire on cylinder 3. The owner had already replaced the plug, wire, cap, and rotor. Diagnostics showed the injector wasn’t firing consistently. Instead of a faulty injector, the issue was a failing injector driver circuit inside the original PCMโa very common failure point on these modules. A new programmed PCM, like this one, fixed it instantly. Before condemning more expensive parts, consider the PCM as the culprit for these ghost-in-the-machine issues.
Common Symptoms of a Failing GM PCM:
- โ Check Engine Light is on with communication error codes (U-codes)
- โ Engine cranks but will not start
- โ Rough or unstable idle
- โ Harsh or delayed transmission shifting
- โ Noticeable decrease in fuel economy
- โ Stalling for no apparent reason
Plug-and-Play Installation: No Dealer Visit Required
Installing your newly programmed PCM is a straightforward job you can do in your own driveway. Follow these simple steps to get your truck back on the road:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On your 1998 GMC Safari, the PCM is typically located in the engine compartment, on the driver’s side near the battery.
- Disconnect the Connectors: Carefully unclip and remove the electrical wiring harnesses from the old module. Inspect the pins for any corrosion and clean them with a contact cleaner if necessary.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New Module: Bolt your new, programmed PCM into place.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new module until they click. Reconnect the negative battery terminal.
- Final Step: Your vehicle may require a security relearn procedure, which is a simple process you can perform yourself. We include instructions for this. Once complete, start the engine and enjoy restored performance!
Guaranteed Compatibility
This module is a direct replacement for part numbers 09355699, 16266645, 16250279, 16258815, and 09366810. It fits a wide range of GM trucks and vans from 1998-1999. Please verify your part number and check the detailed fitment list to ensure this is the correct part for your vehicle.