Restore Peak Performance to Your 1998 Chevy Express Van
Is your trusty 1998 Chevy Express 2500 Van running rough, stalling, or showing a persistent Check Engine Light? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that manages your engine and transmission. A faulty PCM can lead to a cascade of frustrating issues, from poor fuel economy and failed emissions tests to a vehicle that won’t start at all. This replacement PCM, part number 09355699, is the definitive solution to restore your van’s reliability and drivability.
The PCM is the brain of your vehicle’s operation. It constantly analyzes data from sensors throughout the engine and drivetrain to make real-time adjustments to the fuel mixture, ignition timing, and transmission shift points. When it begins to fail, the entire system’s harmony is disrupted. You might notice the engine hesitating, the transmission shifting erratically, or a significant drop in power. Don’t let a failing computer sideline your workhorse van. This module is a direct-fit replacement, designed to integrate seamlessly with your vehicle’s existing systems.
From the Diagnostic Bay
We had a 1998 Express 2500 come into the shop that was a real head-scratcher. The owner had spent a small fortune replacing the MAF sensor, O2 sensors, and even the fuel pump trying to solve a persistent stalling and rough idle issue. The codes were all over the place. After confirming all the new parts were working, we hooked up our scope to the PCM’s injector driver circuits. Sure enough, the signal for cylinder 3 was weak and intermittent. The internal circuitry of the original PCM was failing, causing a misfire that no new sensor could fix. We installed a VIN-programmed module just like this one, performed the security relearn, and the van ran like it just rolled off the assembly line. It’s a perfect example of how the PCM can be the hidden root of many complex problems.
Diagnosing a Failing 1998 Express 2500 PCM
If you’re experiencing any of the following symptoms, your Powertrain Control Module is the likely culprit. A failing PCM can mimic many other component failures, so it’s crucial to recognize the signs that point directly to the vehicle’s central computer.
- ✔ Check Engine Light: The most common indicator, often with codes related to multiple, unrelated sensors or internal processor faults.
- ✔ Engine Stalling or Misfiring: The engine may stall unexpectedly, run rough, or misfire as the PCM fails to properly control ignition or fuel delivery.
- ✔ No-Start Condition: A completely dead PCM can prevent the fuel pump or ignition system from activating, leaving you stranded.
- ✔ Poor Fuel Economy: Inefficient engine parameters set by a faulty module can cause a sudden and significant drop in MPG.
- ✔ Erratic Transmission Shifting: The PCM also controls transmission functions, and a failure can lead to harsh shifts, delayed engagement, or getting stuck in one gear.
- ✔ Failed Emissions Test: Improper engine management almost guarantees a failure at the emissions station.
The Simple, Reliable Solution
Replacing your vehicle’s PCM can seem daunting, but we make the process straightforward. This isn’t just a generic, off-the-shelf part. When you order, you provide us with your van’s Vehicle Identification Number (VIN). Our technicians then program the module with the latest, most up-to-date GM factory software specific to your exact vehicle configuration. This critical step ensures that the PCM communicates perfectly with your engine, transmission, and all other onboard systems, eliminating the need for expensive dealership programming.
This module is a direct replacement for part numbers 16250279, 09366810, and 09355699. It is compatible with a wide range of GM trucks and vans from that era, as detailed in the fitment list. By providing a fully programmed unit, we save you time, money, and the headache of dealing with a vehicle that still doesn’t run right after the repair.
Frequently Asked Questions
Do I need to have this PCM programmed by a dealer?
No. We handle all the programming for you before we ship the part. Simply provide us with your vehicle’s VIN during checkout, and it will arrive ready for installation with the latest GM software for your specific vehicle.
Is this part difficult to install?
The physical installation is typically straightforward. On most 1998 Express vans, the PCM is located in the engine compartment. It involves disconnecting the battery, unplugging the electrical connectors, and unbolting the module. After installation, you may need to perform a simple security relearn procedure, which can be done without special tools and instructions are readily available online.
What information do you need from me?
The only piece of information we need is your 17-digit Vehicle Identification Number (VIN). This allows us to program the module precisely for your van’s engine, transmission, and options.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of your old PCM, then yes, this replacement module will resolve the issue. It’s important to ensure that the codes are not being caused by other faulty components like sensors or wiring.
Is this a new or used part?
This is a high-quality, inspected, and tested replacement part that has been verified to meet or exceed original equipment specifications. It is programmed with fresh, factory-correct software.