Get Your GM Truck Back on the Road with a Reliable, Programmed PCM
Is your 1998 GMC Savana 3500 Van running rough, stalling unexpectedly, or showing a persistent Check Engine Light? As a technician with over two decades of experience, I’ve seen these symptoms countless times. Often, the root cause isn’t a faulty sensor or a bad fuel pump—it’s the brain of the operation, the Powertrain Control Module (PCM). When the PCM fails, it can create a cascade of frustrating and hard-to-diagnose issues, leaving your reliable workhorse dead in the water. This isn’t just an inconvenience; it’s lost time and money.
This replacement Powertrain Control Module is the definitive solution to get your vehicle running right again. We take the biggest headache out of the repair process: programming. Simply provide us with your vehicle’s VIN (Vehicle Identification Number) after your purchase, and we will flash the module with the latest official GM software updates specific to your truck or van. This means no expensive trips to the dealership and no special scan tools required for programming. This is a direct-fit, ready-to-install solution designed to restore your engine’s performance, fuel efficiency, and transmission shifting patterns to factory specifications. This is the same process we use in the shop to ensure a fast and reliable repair.
From the Diagnostic Bay: The Intermittent Stall Case
I remember a ’99 Suburban that came into the shop with a complaint of randomly stalling at stoplights. The owner had already replaced the fuel pump and filter, but the problem persisted. No hard codes were stored, just a history of random misfires. Instead of throwing more parts at it, I hooked up my professional scan tool and monitored live data from the PCM. While driving, I saw the PCM’s data stream completely drop out for a split second, right before the engine would stumble. It was a classic sign of internal PCM failure, likely from years of heat cycles and vibration. We installed a VIN-programmed module just like this one, and the problem was solved instantly. The customer was thrilled to have his reliable family hauler back without any more guesswork.
Is Your GM Vehicle Showing These PCM Failure Signs?
A failing PCM can manifest in various ways. If you’re experiencing any of the following, this module is likely the solution you need. Look out for:
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling.
- ✔ A noticeable drop in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication errors with your scan tool.
- ✔ The anti-theft or security light stays on, preventing startup.
Your Straightforward PCM Installation Guide
Installing your new PCM is a job most DIYers can handle in under an hour with basic hand tools. Follow these steps to get back on the road quickly.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- Locate the PCM: On most of these GM trucks and vans, the PCM is located in the engine compartment, typically on the driver’s side fender or near the battery.
- Disconnect the Module: Carefully unplug the electrical wiring harnesses connected to the old PCM. These connectors have locking tabs that need to be released. Avoid pulling on the wires themselves.
- Remove the Old PCM: Unbolt the module from its mounting bracket. There are usually two or three bolts holding it in place.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and secure it with the bolts. Reconnect the wiring harnesses, ensuring they click securely into place.
- Reconnect the Battery: Reattach the negative battery terminal.
- Perform Security Relearn (If Needed): In some cases, a simple security relearn procedure is required. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine. This allows the vehicle’s security system to recognize the new module.
Verified Fitment For These GM Models
This module is a direct replacement for service number 16250279 and is also compatible with part numbers 09366810 and 09355699. Please verify the part number on your original module to ensure a perfect match. It fits the following vehicles:
- Cadillac Escalade: 1999 (ID 16250279)
- Chevrolet Astro Van: 1998-1999 (ID 16250279)
- Chevrolet Blazer S10: 1998 (w/o build date opt ZN4; ID 16250279 or 16258815)
- Chevrolet Express Van (1500, 2500, 3500): 1998 (Gasoline, ID 16250279)
- Chevrolet Pickup (1500, 2500, 3500): 1998-1999 (Gasoline, ID 16250279)
- Chevrolet S10 Pickup: 1998 (4.3L, w/o build date opt ZN4; ID 16250279 or 16258815)
- Chevrolet Suburban (1500, 2500): 1998-1999 (Gasoline, ID 16250279)
- Chevrolet Tahoe: 1998-1999 (Gasoline, ID 16250279)
- GMC Envoy: 1998 (w/o build date opt ZN4; ID 16250279 or 16258815)
- GMC Jimmy S15: 1998 (w/o build date opt ZN4; ID 16250279 or 16258815)
- GMC Pickup (1500, 2500, 3500): 1998-1999 (Gasoline, ID 16250279)
- GMC Safari Van: 1998-1999 (ID 16250279)
- GMC Savana Van (1500, 2500, 3500): 1998 (Gasoline, ID 16250279)
- GMC Sonoma: 1998 (4.3L, w/o build date opt ZN4; ID 16250279 or 16258815)
- GMC Yukon: 1998-1999 (ID 16250279)
- Isuzu Hombre: 1998 (4.3L, w/o extended build date opt ZN4; ID 16250279 or 16258815)
- Oldsmobile Bravada: 1998 (4.3L, w/o build date opt ZN4; ID 16250279 or 16258815)
Frequently Asked Questions
What exactly is VIN programming?
VIN programming, or flashing, is the process of loading your vehicle’s specific software onto the PCM. This software is determined by your 17-digit VIN and includes all the correct parameters for your engine, transmission, and factory options. We handle this for you so the module is ready to install when it arrives.
Do I need to do anything after installation?
In most cases, the module is plug-and-play. However, some GM vehicles may require a simple security relearn procedure to sync the new PCM with the vehicle’s anti-theft system. This procedure is easy to perform and instructions can be found online or in your owner’s manual.
How do I send you my VIN?
After you complete your purchase, you will receive instructions on how to provide us with your vehicle’s VIN. We cannot ship your order until we receive this information, as it is essential for programming the module correctly.
Where is the PCM located on my 1998 Savana Van?
On the 1998 Savana, the Powertrain Control Module is typically located in the engine bay on the driver’s side, near the battery and air filter housing.
How can I be sure this is the right part?
The best way to confirm fitment is to match the service number from your original module to one of the compatible part numbers listed: 16250279, 09366810, or 09355699. If you are unsure, contact us with your VIN and we can verify compatibility for you.