Is Your GM Truck or Van Running Rough? Get Back on the Road Fast.
If your late-90s Chevy, GMC, or Cadillac is suffering from baffling issues like a persistent check engine light, erratic transmission shifting, a no-start condition, or poor fuel economy, the problem often points directly to a failing Powertrain Control Module (PCM). As the brain of your vehicle, when the PCM starts to go, it can create a cascade of problems that are frustrating and difficult to diagnose. I’ve seen it hundreds of times in my shop: perfectly good sensors and mechanical parts get replaced, but the root cause is the computer itself.
The Simple, Cost-Effective Solution: A Programmed PCM
Forget expensive dealership visits and the hassle of finding a shop that can program a replacement module. We offer a reliable, tested, used OEM PCM that comes fully programmed and flashed specifically for your vehicle. Simply provide us with your Vehicle Identification Number (VIN) after your purchase, and we’ll load the latest, most stable GM software onto the module. It arrives at your door ready for a straightforward installation.
- โ VIN-Programmed: Flashed with the newest GM software updates for your exact vehicle.
- โ Plug & Play: No additional programming is required after installation. This is a direct-fit replacement.
- โ Solves Common Issues: Corrects false check engine lights, harsh shifting, engine stumbling, and no-start problems related to a faulty PCM.
- โ Guaranteed Compatibility: This module is a direct replacement for multiple part numbers, as long as your original module has the service ID 9355699.
From the Shop Floor: A Real-World Scenario
“A customer’s ’99 Chevy 2500 came in last month. It had a persistent misfire code that wouldn’t clear, even after we replaced plugs, wires, and the coil. The fuel pressure was perfect. It felt like we were chasing a ghost. On a hunch, I checked the PCM driver for that cylinder with a scope and found the signal was weak and erratic. Swapping in a programmed PCM like this one solved the problem instantly. It’s a classic failure mode on these older Vortec engines where the internal drivers just wear out.”
Why Choose Our 1998-1999 Chevrolet 2500 PCM?
When you’re dealing with the electronic heart of your truck, you need a part you can trust. This isn’t just a random part from a junkyard. Each module is sourced from a salvaged vehicle, inspected, and then professionally programmed on a bench-tester using certified equipment. This process ensures that when you receive your 1998-1999 Chevrolet 2500 PCM, it communicates perfectly with your engine, transmission, and all related systems, restoring the performance and reliability you depend on.
Expert Pro Tip: Don’t Forget the CASE Relearn
After installing your new PCM, you may get a Check Engine Light with code P1336. This is normal! It means the Crankshaft Position System Variation (CASE) needs to be relearned. Most professional scan tools can perform this 5-minute procedure. It synchronizes the new PCM with your engine’s crankshaft sensor for accurate misfire detection. Skipping this step can lead to false misfire codes down the road.
Easy Installation Guide
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most of these trucks and vans, the PCM is located in the engine compartment, typically on the driver’s side inner fender or near the battery.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old PCM. Inspect the connectors for any signs of corrosion or damage and clean them if necessary.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed PCM into place.
- Reconnect Everything: Firmly plug the wiring harnesses into the new module until they click. Reconnect the negative battery terminal.
- Final Steps: Start the vehicle. It may run a little rough for the first few seconds as it calibrates. As mentioned in our pro tip, a CASE relearn may be required to clear a P1336 code.
Guaranteed Fitment and Compatibility
This Electronic Control Module is a direct replacement for units with Service ID 9355699. It is compatible with the following part numbers:
16258815, 09355699, 16266645, 16250279, 09366810
This module fits a wide range of 1998-1999 GM models, including but not limited to:
- Chevrolet/GMC Pickups (1998-1999): C/K 1500, 2500, 3500 (Gasoline)
- Chevrolet/GMC SUVs (1998-1999): Suburban, Tahoe, Yukon
- Cadillac SUVs (1999): Escalade
- Chevrolet/GMC Vans (1998-1999): Express, Savana, Astro, Safari
- S-Series Trucks/SUVs (1998): S10, S15, Sonoma, Blazer, Jimmy, Bravada, Envoy (4.3L V6)
- Isuzu (1998): Hombre (4.3L V6)
Please verify that your original module has the Service ID 9355699 to ensure perfect compatibility.