Is Your Truck Running Rough? Get Back on the Road with a VIN-Programmed PCM
If your 1998 or 1999 GM truck or van is suffering from frustrating issues like a persistent check engine light, poor fuel economy, erratic shifting, or even a no-start condition, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer of your vehicle, the PCM controls everything from fuel injection and spark timing to transmission shift points. When it fails, the symptoms can be widespread and difficult to diagnose. This replacement module is the reliable, cost-effective solution to restore your vehicle’s performance and drivability.
From the Diagnostic Bay
I once had a 1999 Suburban come in that had its owner chasing his tail for weeks. He’d replaced the spark plugs, wires, O2 sensors, and even the fuel pump based on various codes and advice. The truck still ran poorly, stalling at random and guzzling gas. After hooking up our professional scan tool, we noticed the data stream from the PCM was erratic and dropping out. The module itself was failing internally, sending bad commands to perfectly good parts. We installed a VIN-programmed PCM just like this one, performed the quick security relearn, and the truck ran like it just rolled off the factory floor. It’s a classic case of treating the disease, not just the symptoms.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or misfiring.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A sudden, unexplained drop in fuel efficiency.
- ✔ The vehicle will crank but fails to start.
- ✔ Failure to communicate with diagnostic scan tools.
- ✔ Issues with emissions testing.
The Simple, Plug-and-Play Solution for Your 1998-1999 Chevy 1500 PCM
Don’t waste time and money at a dealership on expensive diagnostics and programming fees. We take the guesswork out of the repair. This is a thoroughly tested, used OEM computer sourced from a salvaged vehicle. The critical difference is our service: we flash the module with the latest official GM software updates specifically for your vehicle’s Vehicle Identification Number (VIN). This ensures that when the part arrives, it’s already configured for your truck’s specific engine, transmission, and options. It’s a direct-fit replacement that simplifies the repair process, getting you back to work and life faster.
This module, part number 16258815, is a direct replacement for a wide range of GM vehicles from this era and interchanges with several other part numbers, including 09355699, 16266645, and 9355699. It is compatible with models such as the Chevrolet and GMC 1500, 2500, and 3500 pickups, Suburban, Tahoe, Yukon, Express and Savana vans, as well as the S10/Blazer family. Please verify the part number or consult the detailed fitment list to ensure compatibility.
Frequently Asked Questions
Do I need to program this computer?
No. The main benefit of our service is that we program the module for you before it ships. Simply provide your vehicle’s 17-digit VIN during or after checkout, and we will flash it with the correct GM calibration for your exact vehicle.
Is this a new part?
No, this is a genuine OEM part that has been sourced from a salvaged vehicle. Each unit is inspected and tested to ensure it is fully functional before being programmed and shipped.
What is a CASE Relearn and will I need to do it?
CASE (Crankshaft Angle Sensor Error) Relearn is a procedure that synchronizes the new PCM with your engine’s crankshaft position sensor. Many vehicles will not require this, but if you have a persistent P1336 trouble code after installation, a CASE relearn will be necessary. This procedure can be performed with most professional-grade scan tools.
How do I provide my VIN?
You can add your VIN in the notes section during checkout or send it to us in a message after placing your order. We cannot ship your part until we have the VIN to program it.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM also functions as the transmission control module (TCM) in these vehicles. If your shifting issues are caused by faulty electronics within the module, this replacement part will resolve them. However, it will not fix internal mechanical issues with the transmission itself.