Is Your GM Truck or Van Running Rough? Get It Back in Shape.
If you’re dealing with a frustrating check engine light, erratic shifting, a no-start condition, or unexplained engine stumbling in your late-90s GM vehicle, a failing Powertrain Control Module (PCM) is often the culprit. This isn’t just an inconvenience; for a workhorse like a Chevy 2500, it means downtime and lost productivity. This replacement engine computer is the reliable, straightforward solution to get your vehicle running properly again, programmed specifically for your truck or van using your VIN.
Common Symptoms & Your Solution
A faulty PCM can cause a host of problems that can be difficult to diagnose. If you’re experiencing any of the following, this module is your fix:
- Persistent Check Engine Light (CEL) with communication error codes (like P0601, P0605, P0606).
- Engine cranks but refuses to start.
- Harsh or unpredictable automatic transmission shifting.
- Poor fuel economy and loss of power.
- Vehicle failing emissions testing.
- Stalling for no apparent reason.
By replacing your old unit with this pre-programmed 1999 Chevrolet 2500 PCM, you are installing a direct solution, flashed with the latest factory software updates from GM to ensure optimal performance and communication between your engine and transmission.
Features & Benefits
- âś” VIN-Specific Programming: We flash the module with your vehicle’s exact VIN, ensuring it’s ready for installation right out of the box. No expensive trip to the dealer needed for programming.
- âś” Updated GM Software: Each computer is loaded with the newest stable software from General Motors, which can resolve factory bugs and improve engine efficiency and transmission behavior.
- âś” Restored Drivability: Get back the smooth idle, crisp throttle response, and reliable performance you depend on for work and daily driving.
- âś” Cost-Effective Solution: This is a quality used OEM part from a salvaged vehicle, providing the reliability of a factory component at a fraction of the cost of a new unit.
- âś” Broad Compatibility: A direct replacement for multiple part numbers, including 09355699, 16266645, and 9366810, fitting a wide range of popular GM trucks, vans, and SUVs.
- âś” Purchase with Confidence: This unit is backed by our one-year replacement warranty.
An Old Pro’s Tip: The ‘Black Box’ Brain
I’ve seen hundreds of these GMT400 and Express platform vehicles over the years. Their durability is legendary, but the electronics can be their Achilles’ heel. The PCM is the ‘brain’ that controls everything from the fuel injectors and spark timing to when the 4L60E/4L80E transmission shifts. When it fails, the vehicle can act possessed. Simply swapping in a junkyard computer without the correct programming is a recipe for disaster—it won’t have the right software for your engine, transmission, or options. Getting a professionally programmed 1999 Chevrolet 2500 PCM like this one is the only way to do the job right and ensure another 20 years of reliable service.
Don’t let a bad computer keep your trusty GM off the road. This is the definitive fix for a wide range of electronic issues plaguing these vehicles. By providing us with your VIN at checkout, you’ll receive a module that’s ready to restore your vehicle’s core functions. It’s the most efficient way to solve the problem and get back to work. For a reliable fix for your 1999 Chevrolet 2500 PCM issues, this is your answer.
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is your vehicle’s main computer. It controls all aspects of the engine and transmission to ensure optimal performance, fuel efficiency, and emissions.
Do I need to do anything after installing this PCM?
In many cases, you may need to perform a security relearn procedure (often called a CASE relearn or Passlock relearn) after installation. This syncs the new computer with your vehicle’s anti-theft system. It’s a simple procedure that can typically be done without special tools and instructions can be found online for your specific model.
How do I provide my Vehicle Identification Number (VIN)?
After you complete your purchase, you will need to send us your 17-digit VIN. We cannot program and ship your part without it. Please double-check it for accuracy to ensure correct programming.
Is this a new part?
No, this is a genuine, used OEM computer that has been carefully sourced from a salvaged vehicle. This ensures OEM quality and fitment at an affordable price point.
What symptoms point to a bad PCM?
Common signs include a persistent check engine light, no-start conditions where the engine just cranks, harsh shifting, poor fuel mileage, and random stalling. Diagnostic codes related to internal module memory errors (like P0601) are a definitive sign.
What does “flashed with the latest updates” mean?
It means we use professional tools to load the most recent and stable software version released by GM for your specific vehicle. This can correct earlier factory issues and improve overall vehicle operation compared to the original software.