Get Your GM Truck Running Right Again
Is your trusty 1998-1999 GMC 2500 Pickup suddenly unreliable? Experiencing frustrating issues like a no-start condition, erratic idling, poor fuel mileage, or a persistent Check Engine Light? The Powertrain Control Module (PCM), your truck’s central computer, is often the culprit. When it fails, it can bring your entire operation to a halt. This isn’t just an inconvenience; it’s a hit to your productivity and peace of mind. We offer a dependable and straightforward solution: a quality-tested, used PCM programmed specifically for your vehicle.
This isn’t just a part in a box. It’s a comprehensive fix. Before we ship it, our technicians flash the module with the latest official GM software updates, using the Vehicle Identification Number (VIN) you provide. This critical step ensures the PCM communicates perfectly with your truck’s engine, transmission, and security systems, just as it did from the factory. You get a reliable component that’s ready for installation, saving you the time, expense, and hassle of a trip to the dealership for programming. This is the smart, efficient way to solve complex electronic issues and restore your truck’s performance.
A Technician’s Notebook: The Intermittent Stall Mystery
I remember a 1999 Chevy Suburban that came into my shop with a problem that had stumped two other mechanics. The owner said it would run fine for 20 minutes, then suddenly stall at a stoplight and refuse to restart for an hour. There were no consistent trouble codes, just a history of random communication errors. After checking all the usual suspects—fuel pressure, crank sensor, ignition module—I started suspecting the PCM. On a hunch, I let the truck run in the bay until it was fully heat-soaked. Then, I used a can of freeze spray directly on the PCM. A minute later, the truck fired right up. The thermal stress was causing an internal failure in the module. We replaced it with a correctly programmed PCM, and the customer called a week later overjoyed that his truck was finally dependable again. This is a classic failure mode for these units, and this programmed 1998-1999 GMC 2500 PCM is the definitive solution.
Is Your Truck Showing These Symptoms?
- ✔ Unexplained Check Engine Light with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0605 (Internal Control Module ROM Error).
- ✔ The engine cranks but refuses to start.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Significant drop in fuel economy.
- ✔ Rough or unstable engine idle.
- ✔ Vehicle fails to pass an emissions test.
- ✔ Intermittent stalling, especially after the engine has warmed up.
A Straightforward Guide to Installation
Replacing the PCM in your GM truck is a job most DIYers can handle with basic tools. Our pre-programmed module makes it even simpler. Here’s a general guide:
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental reconnection.
- 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 or near the firewall.
- Disconnect the Harnesses: The PCM has several large multi-pin electrical connectors. Carefully release the locking tabs or levers and pull the connectors straight out from the module. Avoid wiggling them side-to-side, which can damage the pins.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. Keep the hardware, as you may need it to install the new unit.
- Install the New PCM: Mount your new, pre-programmed 1998-1999 GMC 2500 PCM onto the bracket and secure it.
- Reconnect Everything: Firmly plug the wiring harnesses back into the correct sockets on the new module. Ensure the locking tabs click into place. Reconnect the negative battery terminal.
- Perform Security Relearn (If Necessary): In many cases, you will need to perform a simple security relearn procedure, also known as a CASE (Crankshaft Angle Sensor Error) relearn. This can often be done without special tools and involves a sequence of turning the key. We can provide instructions for this simple but critical final step.
Verified Vehicle Compatibility
This module, identified by service number 16250279 or Hollander ID 590-05161, is a direct replacement for units with ID 09355699. It is compatible with a wide range of GM vehicles. Please verify your part number and vehicle from the list below to ensure a perfect match. Our VIN programming tailors it specifically to your truck’s options.
This part fits many 1998-1999 GM models including, but not limited to:
- ✔ Chevrolet & GMC C/K 1500, 2500, 3500 Pickups (Gasoline)
- ✔ Chevrolet Suburban & Tahoe / GMC Yukon (Gasoline)
- ✔ Chevrolet Express & GMC Savana 1500, 2500, 3500 Vans (Gasoline)
- ✔ Cadillac Escalade (1999)
- ✔ Chevrolet Astro & GMC Safari Vans (1998)
- ✔ Chevrolet S10 / GMC Sonoma, Blazer / Jimmy, Oldsmobile Bravada, Isuzu Hombre (1998, 4.3L V6)
This used 1998-1999 GMC 2500 PCM has been carefully sourced and tested to provide a reliable and cost-effective repair, getting your workhorse back on the road where it belongs.
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, you will receive an email with instructions. Simply reply with your 17-digit VIN, and we will handle the rest before shipping your part.
Is this part new?
No, this is a high-quality, tested used part sourced from a salvaged vehicle. This allows us to offer a reliable fix at a significant cost saving compared to a new dealership part.
What is a CASE relearn and will I need to do it?
A CASE (Crankshaft Angle Sensor Error) relearn synchronizes the new PCM with your engine’s crankshaft position sensor. Most vehicles will require this simple procedure after installation to prevent a Check Engine Light. We can provide easy-to-follow instructions.
Will this fix my transmission shifting problems?
The PCM controls both engine and transmission functions. If your shifting issues are caused by a faulty module, this part is the correct solution. It will restore proper communication between the engine and transmission.
What if I have other part numbers on my old module?
This module is a direct replacement for several part numbers, including 09355699, 16266645, 16258815, and 09366810. As long as your vehicle is on the compatibility list, our VIN programming will ensure it works correctly.