Restore Your Truck’s Performance and Reliability
Is your 1998 or 1999 Chevy Suburban 1500 running rough, stalling unexpectedly, or showing a persistent Check Engine Light? A failing Powertrain Control Module (PCM) is often the culprit. As the central computer for your engine and transmission, its health is critical. This isn’t just an inconvenience; it can affect fuel economy, emissions, and leave you stranded. This quality used PCM, part number 16258815, is the dependable and cost-effective solution to get your truck back to factory-spec operation.
We take the biggest hassle out of the repair process. Unlike a blank module from a parts store or dealership, this PCM arrives at your door pre-programmed with the latest official GM software updates. We use your vehicle’s unique Vehicle Identification Number (VIN) to ensure the software is a perfect match for your specific engine, transmission, and options. This eliminates the need for expensive programming services or specialized scan tools, making it a direct-fit replacement you can trust.
Case Study: A Tricky Diagnosis
I remember a ’99 Yukon that came into my shop with a complaint of intermittent stalling at stoplights and a random no-start condition that would fix itself. The owner had already replaced the fuel pump and ignition coil with no luck. There were no hard codes, just a history code for P0601 (Internal Control Module Memory Check Sum Error). On these GMT400 platforms, a failing PCM can cause these ghost-like issues. We swapped in a VIN-programmed module just like this one, and the problems vanished instantly. It’s a textbook example of how a faulty computer can mimic other component failures, and why a reliable, correctly programmed PCM is the key to a lasting fix.
Is Your GM Truck or Van Showing These Symptoms?
- ✔ Unexplained Check Engine Light (with codes like P0601, P0606)
- ✔ Engine stalling, stumbling, or hesitating
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Complete no-start condition where the engine cranks but won’t fire
- ✔ Poor fuel mileage and decreased engine power
- ✔ Failure to communicate with a diagnostic scan tool
- ✔ Inconsistent instrument panel warnings
A Straightforward Guide to Installation
Installing your 1998-1999 Suburban 1500 PCM is a manageable job for a DIY enthusiast. With the programming already handled, you just need basic hand tools.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most of these trucks and vans, the PCM is located in the engine bay, typically on the driver’s side inner fender or near the firewall.
- Disconnect the Wiring: Carefully unplug the electrical connectors from the old module. There are usually locking tabs that need to be released. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s usually held in by a few bolts.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely fasten it.
- Reconnect Everything: Plug the wiring harnesses firmly into the new module until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn (If Needed): In some cases, you may need to perform a simple security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. This allows the vehicle’s anti-theft system to recognize the new PCM.
Verified Vehicle Compatibility
This module is a direct replacement for service number 16258815 and interchanges with several other part numbers, including 09355699, 16266645, and more. It is confirmed to fit the following vehicles (all with ID 9355699):
- ✔ 1998-1999 Chevrolet & GMC Suburban 1500/2500 (Gasoline)
- ✔ 1998-1999 Chevrolet & GMC C/K 1500/2500/3500 Pickups (Gasoline)
- ✔ 1998-1999 Chevrolet Tahoe & GMC Yukon (Gasoline)
- ✔ 1999 Cadillac Escalade
- ✔ 1998-1999 Chevrolet Express & GMC Savana 1500/2500/3500 Vans (Gasoline)
- ✔ 1998 Chevrolet Astro & GMC Safari
- ✔ 1998 Oldsmobile Bravada, GMC Envoy, Chevrolet S10 Blazer, GMC S15 Jimmy
- ✔ 1998 Chevrolet S10, GMC Sonoma, Isuzu Hombre (4.3L V6)
Frequently Asked Questions
Does this PCM really come programmed?
Yes. After you complete your purchase, you must provide us with your vehicle’s 17-digit VIN. We will then flash the module with the correct, updated GM software for your specific vehicle before shipping. It arrives ready to install.
What if I don’t know my part number?
As long as your vehicle is on the compatibility list, this module will work. The key is providing the correct VIN, which allows us to load the precise software your truck needs. This module replaces multiple original part numbers.
Is this a new part?
No, this is a high-quality, tested computer that was sourced from a salvaged vehicle. Each unit is inspected and verified to be fully functional before being programmed and shipped. This provides a reliable fix at a fraction of the cost of a new dealer part.
Will I need to do anything else after installation?
In most cases, the installation is plug-and-play. However, some GM vehicles of this era may require a Crankshaft Variation (CASE) relearn procedure to be performed with a capable scan tool for optimal performance and to clear certain codes. A security relearn, which doesn’t require tools, may also be needed.
Where do I find my VIN?
Your VIN can be found on your vehicle’s registration, insurance card, or on a metal plate on the driver’s side of the dashboard, visible through the windshield.