Is Your Truck or Van Running Rough, Stalling, or Not Starting at All?
If you’re dealing with frustrating engine problems in your late-90s GM vehicle, a failing Powertrain Control Module (PCM) is a very common culprit. After 20+ years on the road and countless heat cycles under the hood, the internal components of these original computers simply wear out. This can lead to a host of issues that are often misdiagnosed, costing you time and money on parts you don’t need.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We are offering a reliable, used OEM engine computer with service ID 09355699. The critical difference is that before we ship it, we flash it with the latest official GM software, programmed specifically to your vehicle’s VIN. This eliminates the need for any expensive trips to the dealership for programming.
From My Experience in the Shop: A customer’s ’99 Tahoe came in last week with a P0300 random misfire code and a transmission that wouldn’t shift out of second gear. They had already replaced the spark plugs, wires, and even the transmission fluid. A quick scan showed no communication with the PCM. The problem wasn’t mechanical; it was the computer itself. We installed one of these VIN-programmed units, and the truck ran perfectly. This is a scenario I’ve seen hundreds of times on these GMT400-platform vehicles.
The Easiest Fix for Common PCM Failure Symptoms
A failing 1998-1999 GMC 1500 PCM can manifest in many ways. If you’re experiencing any of the following, this module is your likely solution:
- ✔ Complete no-start condition where the engine cranks but won’t fire.
- ✔ Check Engine Light is on with communication error codes.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Poor fuel economy and engine performance.
- ✔ Intermittent stalling for no apparent reason.
- ✔ Apparent failure of multiple sensors at once.
Plug-and-Play Installation: No Dealer Visit Required
Installing your replacement PCM is straightforward. Because we program it to your VIN ahead of time, the security systems (like GM’s Passlock/VATS) will sync correctly, allowing the vehicle to start and run without any special tools. While a CASE relearn may be required for optimal performance, the vehicle will be fully operational upon installation.
- Safety First: Disconnect the negative battery terminal and wait 10-15 minutes for the system capacitors to discharge.
- Locate the PCM: On most trucks and SUVs like the GMC 1500, Tahoe, and Suburban, the PCM is located in the engine compartment on the driver’s side, often near the fender or firewall. On Express/Savana vans, it’s typically in the rear of the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors. Use a small screwdriver to gently release the locking tabs. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new PCM into place. Firmly reconnect the electrical harnesses, ensuring they click and lock securely.
- Reconnect Battery: Reattach the negative battery terminal. The vehicle is now ready to start.
Guaranteed Compatibility for Your Vehicle
This module, identified by service number 09355699, is a direct replacement for a wide range of GM vehicles and interchanges with several other part numbers, including 16266645, 16250279, 16258815, and 09366810. To ensure 100% correct functionality, you must provide your 17-digit VIN after purchase. This allows us to load the precise software your vehicle’s specific options and emissions require.