Is Your 1998-1999 GM Truck or Van Running Rough?
If you’re dealing with frustrating and unpredictable issues like sudden stalling, poor acceleration, a persistent check engine light, or even a no-start condition, the problem might be the very brain of your vehicle: the Powertrain Control Module (PCM). The PCM, also known as the Engine Control Module (ECM), is responsible for managing everything from fuel injection and ignition timing to transmission shifting. When it starts to fail, it can create a cascade of problems that are often difficult to diagnose.
This is a reliable, tested, and VIN-programmed replacement PCM for a wide range of 1998-1999 Chevrolet and GMC trucks, vans, and SUVs. We take the guesswork out of the repair by flashing the module with the latest official GM software calibrated specifically to your vehicle’s VIN. This ensures a seamless installation and restores your vehicle’s original performance and reliability.
From the Diagnostic Bay
I once had a ’99 Chevy K2500 towed in that had its owner completely stumped. It would crank all day but wouldn’t fire up. He had already replaced the fuel pump, ignition coil, and crank sensor, but nothing worked. When I connected my scan tool, I got a ‘No Communication’ error with the engine controller. After verifying the PCM had proper power and ground, it was clear the module itself was dead. A replacement unit, programmed to the truck’s VIN just like this one, had it running smoothly in less than an hour. Proper diagnosis points to the PCM more often than you’d think, and a pre-programmed module is the fastest way back on the road.
Signs You Need a Replacement PCM
- ✔ Check Engine Light: The light is on, and you may have codes related to internal module failure or communication errors.
- ✔ Engine Performance Issues: You’re experiencing random misfires, rough idling, stalling, or a noticeable loss of power.
- ✔ Poor Fuel Economy: A failing PCM can’t efficiently manage the engine’s fuel delivery, leading to a sudden drop in MPG.
- ✔ Transmission Problems: The PCM often controls transmission functions, so a faulty module can cause harsh, erratic, or delayed shifting.
- ✔ No-Start Condition: The engine cranks but will not start, often due to the PCM not firing the injectors or ignition coils.
- ✔ Failed Emissions Test: An improperly functioning PCM can prevent the vehicle from passing an emissions inspection.
The Right Solution: A VIN-Programmed 1998-1999 Suburban PCM
Don’t settle for a generic, unprogrammed computer from a salvage yard that could cause more problems than it solves. Our process ensures you get a part that is ready for your vehicle. We use your Vehicle Identification Number (VIN) to load the exact factory software and updates your truck or van requires. This critical step ensures all systems communicate correctly, from the engine and transmission to the anti-lock brakes.
This module is a direct replacement for multiple service numbers, including: 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810. By providing your VIN at checkout, you guarantee you receive a fully compatible unit.
Installation and Security Relearn
Installation is straightforward. The PCM is typically located in the engine bay on the driver’s side. After disconnecting the battery, you can unbolt the old module, disconnect the wiring harnesses, and install the new one. However, after installation, you will likely need to perform a security relearn procedure (often called a CASE relearn or Passlock relearn). This syncs the new PCM with your vehicle’s anti-theft system. The procedure is simple and typically involves a sequence of turning the key on and off. Instructions for this process are widely available online for your specific model.
Frequently Asked Questions
Do I need to do anything after installing this PCM?
Yes. In most cases, you will need to perform a security relearn procedure to sync the new computer with your vehicle’s anti-theft system. This process typically takes about 30 minutes and does not require special tools.
Is this a new part?
No, this is a thoroughly tested, used OEM part sourced from a salvaged vehicle. We ensure it is fully functional before programming it for your vehicle.
How do I provide my VIN number?
After you complete your purchase, you will need to send us your vehicle’s 17-digit VIN. We will provide clear instructions on how to do this. We cannot ship your part until we receive the VIN.
Will this fix my vehicle’s problem for sure?
This part is a guaranteed fix for a faulty PCM. However, it’s essential that your vehicle has been properly diagnosed. This module will not fix problems related to other faulty sensors or wiring issues.
What if my original part number isn’t 16266645?
This PCM is a direct replacement for several part numbers, including 09355699, 9355699, 16250279, and others listed in the description. As long as your part number is on our cross-reference list, this module will work.