Is Your 1998-1999 GM Truck or Van Running Rough?
If your Chevrolet 3500, Suburban, Tahoe, or other compatible GM vehicle is experiencing frustrating issues like a persistent check engine light, poor fuel economy, erratic shifting, or even a no-start condition, the culprit is often a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM is responsible for managing everything from fuel injection and spark timing to transmission shift points and emissions controls. When it begins to fail, the symptoms can be widespread and difficult to diagnose, leaving you stranded and facing a costly repair bill.
The Direct-Fit Solution for Your 1998-1999 Chevrolet 3500 PCM
This genuine, used OEM Powertrain Control Module, part number 09366810 (interchangeable with 09355699, 16266645, and others), is the reliable and cost-effective solution you need. We take the guesswork and hassle out of the replacement process. Before this unit ships, we program it specifically to your vehicle’s Vehicle Identification Number (VIN). This ensures that it has the correct factory software and the latest updates from GM, making the installation process as seamless as possible. You get a part that is ready to integrate with your truck’s specific engine, transmission, and options.
From the Diagnostic Bay
We had a ’99 Suburban towed in that had its owner chasing his tail for weeks. The truck would randomly stall and refuse to restart for hours. He had replaced the fuel pump, crank sensor, and ignition coil based on forum advice, with no luck. When we hooked up our scanner, we saw erratic data from multiple sensors and communication loss codes. Instead of immediately condemning the PCM, we checked the basics first. We found a corroded ground wire on the engine block, right near the PCM. After cleaning and re-securing it, the truck ran perfectly. The lesson? Always check your main power and ground connections to the PCM before replacing it. A 10-minute check can save you hundreds of dollars.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various codes
- ✔ Engine stalling, stumbling, or misfiring
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Complete no-start or intermittent starting issues
- ✔ Noticeable decrease in fuel economy
- ✔ Failure to pass an emissions test
- ✔ Communication errors with diagnostic scan tools
Why Choose a VIN-Programmed Module?
Simply swapping a PCM from another vehicle won’t work on these GM models. The module is tied to the specific VIN for security (anti-theft) and operational parameters. Our programming service handles this for you. By providing your VIN at checkout, you receive a module that is correctly configured for your exact vehicle, which significantly simplifies the installation. While this part is plug-and-play, please be aware that a Crankshaft Variation Relearn (also known as a CASE relearn) may be required with a capable scan tool after installation to prevent a P1336 trouble code. In some cases, a security relearn procedure may also be necessary, which can typically be done without special tools.
This tested, used module is a dependable alternative to expensive dealership parts. It’s sourced from a salvaged vehicle and guaranteed to be functional. Restore the performance and reliability of your truck or van with a properly functioning brain. This 1998-1999 Chevrolet 3500 PCM is your key to getting back on the road with confidence.
Frequently Asked Questions
Do I need to get this PCM programmed?
No. We handle the programming for you before we ship the part. All you need to do is provide us with your vehicle’s 17-digit VIN when you place your order.
Is this a new part?
No, this is a genuine, tested, and fully functional used OEM part sourced from a salvaged vehicle. This ensures OEM quality and fitment at a fraction of the cost of a new unit.
What is a CASE Relearn?
A CASE (Crankshaft Angle Sensor Error) Relearn is a procedure that synchronizes the new PCM with the crankshaft position sensor. If not performed after installation, your vehicle may set a P1336 trouble code and keep the check engine light on. This procedure requires a compatible professional-grade scan tool.
How do I find my part number?
Your original PCM’s part number is printed on the factory label, typically on the main connector side. It’s important to match this number or one of the listed compatible part numbers to ensure proper fitment. This unit replaces part numbers 09355699, 16266645, 16250279, 16258815, 09366810, and more.
What happens if I forget to provide my VIN?
Providing your VIN is essential for the programming service. If you do not provide it during checkout, we will contact you to request it. This may delay the shipment of your order, as we cannot program and ship the module without it.