Is Your Workhorse Truck Stumbling? Get It Back on the Job.
If your 1998-1999 Chevrolet 3500 is suddenly plagued with a persistent Check Engine Light, erratic shifting, a no-start condition, or abysmal fuel economy, the problem often points directly to a failing Powertrain Control Module (PCM). As a technician with over two decades of experience under the hood of these exact trucks, I’ve seen countless owners chase expensive sensor and component replacements, only to find the root cause was the vehicle’s computer all along. This isn’t just a part; it’s the brain of your engine and transmission, and when it falters, the entire vehicle suffers.
The Smart Solution: A Pre-Programmed, Ready-to-Install PCM
Forget the hassle and high cost of a dealership visit. We offer a reliable, tested, and warrantied used PCM that arrives at your door pre-programmed with the latest official GM software updates. All we need is your vehicle’s 17-digit VIN during checkout. This critical step ensures the module is a perfect match for your truck’s specific configuration, restoring its original performance and efficiency. This is the same service a dealer performs, but without the towing bills and scheduling headaches.
Expert Pro Tip: Check Your Grounds Before You Swap
In my shop, I’ve seen dozens of cases where a failing PCM was misdiagnosed. Before you replace the module, take 10 minutes to inspect and clean the main engine-to-chassis ground straps. On these GMT400 platform trucks, a corroded or loose ground can cause voltage issues that mimic PCM failure, leading to strange electrical gremlins and communication codes. A quick check with a wire brush can sometimes save you the cost of a replacement part.
Why Choose Our Programmed 1998-1999 Chevrolet 3500 PCM?
- โ VIN-Specific Programming: We flash the module with the newest GM calibration for your exact vehicle, ensuring seamless communication and operation.
- โ Eliminate Common Failures: A direct solution for issues like harsh shifting, no-start, random stalling, and multiple engine codes.
- โ Save Time and Money: This module is ready for installation right out of the box. No additional programming fees or dealer appointments are required.
- โ Broad Compatibility: This unit directly replaces multiple part numbers, including 09355699, 16266645, 16258815, and more. See our full fitment list to confirm.
- โ Proven Reliability: Sourced from salvaged vehicles and thoroughly tested, this is a dependable and cost-effective repair.
Simple DIY Installation Guide
Replacing the PCM on your Chevy 3500 is a straightforward job you can do in your own driveway. Typically located in the engine bay on the driver’s side, it’s an accessible component.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: Find the module, usually a silver box with several large multi-pin connectors, mounted to the inner fender or firewall.
- Disconnect and Remove: Carefully unplug the wiring harnesses. They have locking tabs that need to be released. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed PCM into place. Firmly reconnect the wiring harnesses, ensuring they click and lock securely.
- Final Step: Reconnect the negative battery terminal. In some cases, a Crankshaft Position Sensor (CASE) relearn procedure may be required using a capable scan tool to clear a P1336 code, but the truck will start and run without it.
Don’t let a faulty computer keep your truck sidelined. Provide your VIN, place your order, and get the right part, programmed and ready to restore your vehicle’s power and reliability.