Restore Peak Performance to Your GM Truck or Van
Is your trusty 1998-1999 Chevrolet 2500 Pickup suddenly giving you headaches? Unexplained stalling, erratic shifting, a persistent check engine light, or a frustrating no-start condition can often point directly to a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, its health is non-negotiable for reliability. This isn’t just a replacement part; it’s a solution. We provide a high-quality replacement PCM, part number 16250279, that arrives at your door fully programmed with the latest official GM software updates, tailored specifically to your vehicle’s VIN.
Forget the expensive trip to the dealership for programming. Simply provide us with your Vehicle Identification Number (VIN) after purchase, and our experts will handle the flashing process. This ensures that when your module arrives, it communicates flawlessly with your truck’s systems, restoring the smooth operation and dependability you rely on. This is the most direct path to getting your workhorse back on the road and running strong.
A Technician’s Notebook
I remember a ’99 GMC Sierra 2500 (a cousin to this Chevy) that came into the bay with a complaint that had two other shops stumped. The owner described intermittent stalling at stoplights and harsh, unpredictable 1-2 shifts. No consistent codes, just a general feeling that the truck wasn’t right. After checking all the usual suspects—fuel pressure, sensors, wiring—we hooked up a high-level scanner and monitored the PCM’s live data. We saw erratic voltage readings from the internal processor. It was a classic case of a PCM failing under heat soak. We installed one of these VIN-programmed modules, performed the quick security relearn, and the truck ran like it just rolled off the assembly line. The owner was thrilled to have his reliable truck back without a massive dealership bill.
Is Your Vehicle Showing These Symptoms?
- ✔ Check Engine Light is on with codes like P0601, P0602, or P0605 (Internal Control Module Memory/Processor Error).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A noticeable drop in fuel economy.
- ✔ Communication errors with your scan tool.
- ✔ Other warning lights on the dash appear randomly.
A Straightforward Guide to Installation
Installing your new 1998-1999 Chevrolet 2500 PCM is a job most DIYers can handle in their own driveway. Follow these steps carefully for a smooth installation.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On most of these GM trucks and vans, you’ll find the PCM in the engine bay, typically on the driver’s side fender or near the battery.
- Disconnect Connectors: Carefully unclip and remove all wiring harness connectors from the old module. These connectors are often color-coded; take a photo with your phone if it helps you remember their positions.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. It’s usually held in by two or three bolts.
- Install the New Module: Seat your new, pre-programmed PCM into the mounting bracket and secure it with the bolts.
- Reconnect Everything: Firmly plug the wiring harnesses back into their correct slots on the new module. Reconnect the negative battery terminal.
- Perform Security Relearn: In most cases, you will need to perform a simple security relearn procedure (often called a CASE learn or Passlock relearn). This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Instructions are readily available online for your specific model.
Verified Vehicle Compatibility
This Electronic Control Module is a direct replacement for part numbers 16250279, 09366810, and 09355699. It is guaranteed to fit a wide range of GM vehicles. Please match your original part number or verify fitment with the list below. This unit fits many 1998-1999 gasoline-powered Chevrolet, GMC, Cadillac, Oldsmobile, and Isuzu trucks, vans, and SUVs including the C/K 1500/2500/3500 series, Suburban, Tahoe, Yukon, Escalade, Astro, Safari, Express, and Savana, among others. Always confirm your vehicle’s specific requirements by matching the ID number on your original module.
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming before we ship the part. Just provide your VIN during checkout, and the module will arrive with the latest GM software specific to your vehicle, ready for installation.
What is a “CASE Relearn” and is it difficult?
A Crankshaft Variation Relearn (CASE Relearn) or Security Relearn syncs the new PCM to your vehicle’s anti-theft and crankshaft position sensor systems. It’s a simple procedure that usually doesn’t require special tools. A common method is the “10-minute key on” cycle, but you should look up the exact steps for your specific year and model.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both the engine and the transmission. If the module is faulty, it can cause poor shift quality, delayed shifts, or incorrect gear selection. Replacing a bad PCM often resolves these issues.
How do I find my original part number?
Your original part number is printed on a sticker on the PCM itself. You will need to locate the module on your vehicle (typically in the engine bay) and read the service number from the label.
Is this compatible with other part numbers?
Yes, this module is a direct replacement for several part numbers, including 16250279, 09366810, and 09355699. If your old module has one of these numbers, this part will work for you.