Restore Peak Performance to Your GM Truck or Van
Is your 1998 or 1999 Chevy or GMC truck, van, or SUV suffering from frustrating issues like stalling, a no-start condition, an illuminated Check Engine Light, or erratic transmission shifting? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. A faulty PCM can disrupt everything from fuel delivery and spark timing to transmission operation, leaving you stranded and facing a complex diagnosis. This genuine GM engine computer, part number 09366810, is the reliable, cost-effective solution to get your vehicle back on the road and running smoothly.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the guesswork and expensive dealership trips out of the equation. Upon purchase, simply provide us with your vehicle’s 17-digit VIN. Our technicians will then program the module with the latest, most stable software updates directly from GM, ensuring it is perfectly matched to your vehicle’s specific configuration. This critical step ensures proper communication between all vehicle systems and restores original factory performance.
From the Diagnostic Bay
We had a ’99 Suburban towed in that the owner had spent a fortune on. He’d replaced the fuel pump, filter, and all eight injectors trying to solve an intermittent crank-no-start issue. He was convinced it was a fuel problem. We connected our scanner and couldn’t even communicate with the engine computer. A quick check with a noid light confirmed our suspicion: the injectors weren’t receiving a pulse signal from the PCM. The original 1998-1999 GM Truck PCM had an internal failure. We installed one of our programmed modules, performed the security relearn, and the truck fired up on the first try and ran perfectly. It’s a powerful reminder to always check the basics and confirm the computer is commanding the components before replacing expensive parts.
Symptoms of a Failing 1998-1999 GM Truck PCM
- ✔ Engine cranks but refuses to start.
- ✔ Intermittent stalling, especially when warm or at idle.
- ✔ Illuminated Check Engine Light with communication error codes (e.g., U-codes) or false sensor codes.
- ✔ Noticeable decrease in fuel economy and engine power.
- ✔ Harsh, erratic, or delayed automatic transmission shifting.
- ✔ The anti-theft or security light stays on, preventing the engine from starting.
- ✔ Inability for a diagnostic scan tool to connect with the module.
Plug-and-Play Solution with Simple Relearn
This tested, used OEM module is a direct replacement for multiple part numbers, including 09355699, 16266645, and 09366810. Because we program it to your VIN before shipping, the complex and costly programming at a dealership is eliminated. The only step required after installation is a straightforward security relearn procedure (often called a VATS or Passlock relearn), which syncs the new PCM to your vehicle’s existing keys and anti-theft system. This procedure can typically be done in your driveway without any special tools in about 30 minutes. By choosing this solution, you restore the core of your vehicle’s engine management system with a reliable, VIN-matched component.
Frequently Asked Questions
Do I need to get this PCM programmed?
No. We handle all the programming for you before the part is shipped. All we need is your vehicle’s 17-digit VIN to load the correct GM-certified software for your specific make, model, and options.
What is a security relearn and is it difficult?
A security relearn is a required procedure that syncs the new PCM with your vehicle’s anti-theft system. It is not difficult and requires no special tools. The most common method involves a series of key cycles (e.g., turning the key to ‘ON’ for 10 minutes, then ‘OFF’ for 10 seconds, repeated three times). We can provide general instructions upon request.
Is this a new part?
This is a high-quality, used OEM part sourced from a salvaged vehicle. Each unit is thoroughly inspected and tested to ensure full functionality before being programmed and shipped.
How can I be sure this fits my vehicle?
This module fits a very wide range of 1998-1999 GM trucks, vans, and SUVs. The best way to ensure compatibility is to provide your VIN during checkout. We will verify the fitment and program the correct software for your exact vehicle.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both the engine and the transmission. If your shifting issues are caused by faulty electronic signals or a failing computer, this replacement module should resolve them. However, it will not fix internal mechanical problems with the transmission itself.