Is Your 1998-1999 Savana 2500 Running Rough or Not Starting?
If you’re dealing with a persistent Check Engine Light, poor fuel economy, erratic engine behavior, or a no-start condition, a failing Powertrain Control Module (PCM) is often the culprit. In my 20+ years as a technician, I’ve seen these exact issues on countless GM trucks and vans from this era. This isn’t just a part; it’s the solution to get your reliable workhorse back on the road, performing as it should.
This is a genuine, used OEM PCM that has been meticulously tested and is ready for installation. We take the guesswork and dealer expense out of the equation. Simply provide us with your vehicle’s VIN after purchase, and we will program the module with the latest official GM software updates specific to your 1998–1999 Savana 2500. This ensures perfect communication with your vehicle’s systems right out of the box.
Symptoms of a Failing GM PCM:
- ✔ Check Engine Light is on with codes related to PCM failure.
- ✔ Engine cranks but refuses to start.
- ✔ Noticeable drop in fuel mileage.
- ✔ Harsh or incorrect shifting from the transmission.
- ✔ Stalling, hesitation, or misfires while driving.
- ✔ Failure to pass an emissions test.
Expert Pro Tip from a 20-Year Technician
Before you swap out your PCM, take a moment to inspect the module’s electrical connectors. Over the years, the pins and sockets can develop a green, powdery corrosion from moisture intrusion. I’ve seen dozens of trucks where simply cleaning the connectors with a specialized electronic cleaner and a small brush restored full function. It’s a 10-minute check that can save you from replacing a part that might still be good. If they’re clean and the problem persists, the PCM itself is the next logical step.
Plug-and-Play Installation: No Dealer Visit Required
Because we program this 1998-1999 Savana 2500 PCM to your VIN, the complicated and costly security relearn procedure at a dealership is typically not required. This makes for a straightforward DIY installation.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most Savana and Express vans, the PCM is located in the engine compartment, on the driver’s side near the battery or firewall.
- Disconnect Connectors: Carefully unclip the wiring harnesses from the old module. Note their colors or positions if they are different.
- 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 and reconnect the negative battery terminal.
- Start the Engine: Your vehicle should now start and run correctly with the new module.
Guaranteed Compatibility and Part Number Information
This module, identified by service number 9355699, is a direct replacement for a wide range of GM vehicles. If your original module has one of the following part numbers, this unit will work for you:
Compatible Part Numbers: 09355699, 16266645, 16250279, 16258815, 09366810
This part is confirmed to fit a vast array of GM trucks and vans from 1998-1999, including the Chevrolet Express, GMC Savana, Chevrolet and GMC Pickups (1500, 2500, 3500), Tahoe, Yukon, Suburban, Escalade, and S-10/Blazer platform vehicles that require ID 9355699. Ordering this part ensures you get a reliable, VIN-matched brain for your vehicle’s powertrain.