Get Your GM Truck Running Right Again with a VIN-Programmed PCM
Is your 1998-1999 GMC 2500, or another classic GM truck or van, giving you headaches? If you’re dealing with a persistent check engine light, erratic transmission shifting, a no-start condition, or rough idling, a failing Powertrain Control Module (PCM) is a very common cause. After 20+ years on the road, the original electronics can fail, leading to frustrating and hard-to-diagnose problems. This isn’t just a replacement part; it’s the reliable, straightforward solution to restore your vehicle’s performance and dependability.
The Simple Solution for Complex Problems: Your 1998-1999 GMC 2500 PCM
Forget expensive diagnostic fees and the hassle of getting your vehicle towed to a dealership for programming. We take care of the hard part for you. This is a genuine, used OEM PCM, meticulously tested and ready for installation. We flash it with the latest GM-approved software calibrations specific to your vehicle’s VIN. This ensures that when it arrives, it’s ready to communicate perfectly with your engine, transmission, and all related systems.
Expert Pro Tip from 20+ Years on the Bench: Before you condemn a PCM, take a moment to inspect the main connector harnesses. On these GMT400 and Express/Savana platforms, the plastic connector clips become brittle and can break. A loose connection can mimic a failed PCM perfectly, causing intermittent stalls or communication errors. I’ve seen dozens of trucks where simply cleaning the pins with a contact cleaner and securing the harness with a zip tie fixed the issue. It’s a 5-minute check that can save you time and money.
Key Features & Benefits:
- âś” VIN-Specific Programming: We flash this computer with your vehicle’s exact VIN, ensuring it works seamlessly with your specific options and powertrain.
- âś” Latest GM Software: Your module arrives with the newest software updates from General Motors, which can resolve factory bugs and improve drivability and fuel economy.
- âś” True Plug-and-Play: No additional programming or dealer visits are required. Once installed, your vehicle will start and run correctly.
- âś” Fixes Common Issues: An effective solution for check engine lights (with various codes), harsh shifting, engine stalling, and no-communication errors.
- âś” Cost-Effective Repair: Save hundreds of dollars compared to sourcing and programming a new module from a dealership.
Plug-and-Play Installation: No Dealer Visit Required
Installing this PCM is a job most DIY mechanics can handle in under 30 minutes with basic tools. Follow these simple steps:
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most 1998-1999 GM trucks and SUVs, the PCM is located in the engine compartment, typically on the driver’s side inner fender. On vans, it’s often in the rear of the engine compartment.
- Disconnect the Harnesses: Carefully unclip and remove the electrical connectors from the old PCM. Inspect them for any corrosion or damage.
- Swap the Module: Unbolt the old PCM from its mounting bracket and install the new one in its place.
- Reconnect Everything: Securely plug the electrical harnesses into your new PCM. Reconnect the negative battery terminal.
- Start the Engine: Your vehicle is now ready to go! In some cases, a Crankshaft Variation Relearn (CASE Relearn) may be needed to turn off a P1336 code, but the vehicle will run and drive without it.
Part Number & Fitment Verification
This module is a direct replacement for several service numbers. To confirm compatibility, please ensure your original module has one of the following part numbers printed on its label:
Interchangeable Part Numbers: 09355699, 16266645, 16250279, 16258815, 09366810
This PCM fits a wide range of 1998-1999 General Motors vehicles, including Chevrolet & GMC Pickups (1500, 2500, 3500), Suburban, Tahoe, Yukon, Escalade, Express & Savana Vans, Astro & Safari Vans, S10/Sonoma, Blazer/Jimmy, and more. The critical factor is matching the service ID number 09355699 on your original computer.