Is Your GM Truck or Van Running Rough, Stalling, or Not Starting?
If you’re dealing with frustrating engine problems on your late-90s GM vehicle, the Powertrain Control Module (PCM) is often the culprit. After decades of heat cycles and vibrations in the engine bay, these electronic brains can fail, leading to a host of issues that can sideline your workhorse truck or family van. This isn’t just an inconvenience; it’s a problem that needs a reliable, straightforward solution.
This is a tested, used OEM Powertrain Control Module that we program specifically to your vehicle’s VIN. Forget expensive trips to the dealership for programming or the uncertainty of a generic, un-flashed unit. We handle the critical software side for you, ensuring that when the part arrives, it’s ready to be installed and get you back on the road.
Common Symptoms of a Failing GM PCM:
Over my 20+ years turning wrenches, I’ve seen these exact modules cause some tricky diagnostic headaches. If your truck is showing any of these signs, a faulty PCM is a very likely cause:
- ✔ Unexplained Check Engine Light (CEL) that won’t clear
- ✔ Engine stalls intermittently or won’t start at all
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Poor fuel economy and noticeable loss of power
- ✔ Communication errors with diagnostic scan tools
- ✔ No-start condition even with a good battery and starter
From the Shop Floor: A Real-World Diagnosis
“A customer’s ’99 Chevy 3500 dually came into my shop last month with a classic no-start problem. The owner had already replaced the fuel pump, thinking that was the issue, but it still wouldn’t fire up. We hooked up our scope and found there was no signal from the PCM to activate the fuel pump relay. It’s a common failure point on these units; the internal driver circuit burns out. We installed a VIN-programmed PCM just like this one, and the truck fired right up on the first try. It saved the customer from chasing phantom electrical gremlins for weeks.”
Why Choose Our Pre-Programmed 1998-1999 GMC 3500 PCM?
This isn’t just a used part; it’s a complete solution. We take a genuine, functioning OEM module from a salvaged vehicle and flash it with the latest official GM calibration for your specific vehicle. By providing your VIN at checkout, you ensure perfect compatibility with your engine, transmission, and factory options.
Plug-and-Play Installation: No Dealer Visit Required
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most of these trucks and vans, it’s 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 module. Inspect the pins for any corrosion or damage and clean them with contact cleaner if necessary.
- Swap the Module: Unbolt the old PCM and secure the new, programmed module in its place.
- Reconnect Everything: Plug the wiring harnesses firmly into the new PCM and reconnect the negative battery terminal.
- Security Relearn: In many cases, you will need to perform a simple security relearn procedure (often called a Passlock relearn) which takes about 30 minutes and requires only the ignition key. Instructions are widely available online for your specific model.
Guaranteed Compatibility
This module is a direct replacement for several part numbers. Please verify your original part number matches one of the following to ensure compatibility:
Interchangeable Part Numbers: 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, 9366810. The service ID number 9355699 is the key identifier for this wide range of applications.
This unit is confirmed to fit a massive range of 1998-1999 GM vehicles, including the Chevrolet and GMC 1500, 2500, and 3500 pickups, Suburban, Tahoe, Yukon, Express and Savana vans, as well as the S-10, Blazer, Jimmy, and many more. Please see the detailed fitment list to confirm your specific model.