Is Your GM Truck or Van Experiencing Mysterious Issues?
If you’re dealing with a frustrating check engine light, erratic engine behavior, poor fuel economy, or harsh shifting in your 1998-1999 GM vehicle, the root cause might be a failing Powertrain Control Module (PCM). As the central computer, the PCM manages everything from fuel injection and spark timing to transmission shift points. When it starts to fail, it can create a cascade of problems that are often difficult to diagnose, leading to wasted time and money on incorrect repairs.
From the Diagnostic Bay
I once had a 1999 Chevy Suburban come into the shop with a complaint of a harsh 1-2 shift and intermittent stalling at stoplights. The owner had already replaced the transmission speed sensor and the throttle position sensor with no improvement. After hooking up the scan tool, I noticed the data stream from the PCM was inconsistent, with torque converter clutch commands dropping out randomly. Instead of a costly transmission rebuild, we identified the faulty PCM. A correctly programmed replacement module, like this one, had the truck running and shifting smoothly in under an hour. It’s a classic case of the vehicle’s ‘brain’ causing what looks like a mechanical problem.
Common Symptoms of a Failing GM PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh, erratic, or delayed automatic transmission shifting.
- ✔ The vehicle fails to start, or starts and then immediately dies.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Failure to pass state emissions testing.
The Direct-Fit Solution: A VIN-Programmed PCM 9355699
Don’t let a faulty computer keep your reliable GM truck or van off the road. This is a genuine, used OEM Powertrain Control Module that offers a reliable and cost-effective solution. The key to our service is the professional programming we perform before shipping. When you provide us with your vehicle’s VIN, we flash the module with the latest, most stable software updates directly from GM. This critical step ensures the PCM is a perfect match for your vehicle’s specific configuration, including engine size, transmission type, and emissions equipment.
By receiving a pre-programmed module, you can avoid expensive trips to the dealership for programming. The installation is straightforward for a DIY mechanic or any professional technician. It’s a plug-and-play repair that restores the precise control your engine and transmission need to operate at peak performance and efficiency.
This module is a direct replacement for service numbers 09355699, 16266645, 16250279, 16258815, 09366810, and 9366810, and fits a wide array of popular vehicles like the Chevrolet Express, GMC Savana, Tahoe, Yukon, Suburban, S10/Blazer, and various pickups. Please verify your part number and consult the fitment list to ensure compatibility.
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It controls all aspects of the engine and transmission to ensure optimal performance, fuel economy, and emissions. It’s essentially the brain of your vehicle’s powertrain.
Do I need to get this computer programmed?
No. We handle the programming for you before we ship the item. Simply provide us with your vehicle’s 17-digit VIN during or after checkout, and we will flash the computer with the latest GM software specific to your vehicle.
Is this a new part?
This is a high-quality, tested, used OEM part sourced from a salvaged vehicle. Each unit is inspected and verified to be fully functional before being programmed and shipped. This provides OEM reliability at a fraction of the cost of a new module.
What is a CASE relearn and will I need to do one?
A CASE (Crankshaft Angle Sensor Error) relearn synchronizes the PCM with the crankshaft position sensor. After installing this PCM 9355699, a CASE relearn may be necessary to turn off the check engine light. Most mid-level scan tools can perform this procedure in a few minutes.
How do I provide my VIN?
After you complete your purchase, you can send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your order until we receive the VIN, as the programming is a required step.