Is Your Trusty GM Truck or Van Suddenly Unreliable?
If you’re dealing with frustrating issues on your 1998 Chevrolet Express 3500 or another GM vehicle from that eraโlike intermittent stalling, a persistent check engine light, erratic transmission shifting, or a complete no-start conditionโthe problem often points to a failing Powertrain Control Module (PCM). As the central computer, when the PCM starts to fail, it can create a cascade of confusing symptoms that are difficult to diagnose.
From the Shop Floor: A Real-World Diagnosis
“A customer’s 1998 GMC Savana 3500 work van came into my shop last month. The complaint was that it would run fine for 20 minutes, then stall at a stoplight and refuse to restart for an hour. No specific codes were stored, just a generic communication loss error. After verifying fuel pressure and spark were good, I hooked up my professional scan tool. I noticed the 5-volt reference signal to the sensors was dropping out right before it stalled. This is a classic sign of an internal PCM failure on these GM models. The heat buildup in the engine bay causes internal solder joints and electronic components to fail over time, leading to these exact intermittent electrical ghosts. We confirmed it by swapping in a known-good module, and the problem vanished instantly.”
The Brain of Your Engine: Why the PCM is Critical
The PCM, also known as the ECM or engine computer, is responsible for managing everything from fuel injection and ignition timing to transmission shift points and emissions controls. After two decades of heat cycles, vibrations, and electrical demands, the original components on the circuit board can degrade and fail. This isn’t a reflection of poor maintenance; it’s simply the operational lifespan of complex electronics.
Common Symptoms of a Failing 16250279 PCM:
- โ No-start or difficult starting conditions, especially when warm.
- โ Unexplained stalling while driving or at idle.
- โ Harsh or erratic automatic transmission shifting.
- โ Check Engine Light is on with communication-related fault codes (U-codes) or sensor circuit codes.
- โ Poor fuel economy and engine performance.
- โ Failure to communicate with a diagnostic scan tool.
The Simple, Reliable Solution: Programmed & Ready to Install
This Powertrain Control Module is the definitive solution to get your vehicle running properly again. The biggest hurdle with replacing a PCM has always been the expensive and time-consuming programming required at a dealership. We eliminate that step entirely.
When you order from us, we don’t just send you a part in a box. We take your vehicle’s unique 17-digit Vehicle Identification Number (VIN) and flash the module with the latest, most stable software updates directly from GM. This ensures perfect compatibility and performance right out of the box.
Key Benefits of This Module:
- โ VIN-Programmed for Your Vehicle: Arrives ready for installation, no dealer visit required.
- โ Direct-Fit Replacement: Correctly replaces original part numbers 16250279, 09366810, and 09355699.
- โ Restores Original Performance: Solves common running issues caused by a faulty computer.
- โ Latest GM Software: Loaded with factory updates to improve drivability and correct known issues from the original software.
Installation and Fitment Confirmation
Installation is typically straightforward. On most of these trucks and vans (like the Express, Savana, Tahoe, and C/K Pickups), the PCM is located in the engine bay, usually on the driver’s side. After disconnecting the battery, you simply unplug the electrical connectors, unbolt the old module, and install the new one. After reconnecting everything, you may need to perform a simple security relearn procedure, which can often be done without special tools. Instructions are widely available online for this process.
Please double-check the part number on your existing module to ensure a match. This module is a direct replacement for units with service numbers 16250279, 09366810, or 09355699. Refer to the detailed fitment list to confirm it is the correct part for your specific year, make, and model.