Restore Your Van’s Performance and Reliability
Is your Chevrolet Express or GMC Savana van giving you headaches? If you’re dealing with a persistent check engine light, erratic engine behavior, stalling, or a frustrating no-start condition, a failing Powertrain Control Module (PCM) is often the culprit. As the brain of your vehicle, when the PCM falters, it can cause a cascade of problems that are difficult to diagnose. This isn’t just an inconvenience; it can leave you stranded. This genuine OEM PCM, part number 16258815, is the reliable, cost-effective solution you need to get your workhorse back on the road and running right.
We take the guesswork and high costs out of the equation. Forget expensive dealership visits for programming. Simply provide us with your vehicle’s VIN during checkout, and our technicians will flash this module with the latest official GM software specific to your van. This ensures that once it arrives, it’s a true plug-and-play solution. It will correctly manage everything from fuel delivery and ignition timing to transmission shifting and the vehicle’s security system, restoring the smooth operation you depend on.
Case Study: A Tricky Diagnosis
I remember a 1999 Savana 3500 that came into my shop a few years back. The owner, a contractor, was at his wit’s end. The van would randomly stall at traffic lights, but never threw a consistent code. We checked fuel pressure, sensors, and wiring harnesses—everything seemed fine. On a hunch, I monitored the live data stream from the PCM and noticed the injector pulse width would suddenly drop to zero for a split second, causing the stall. There were no internal fault codes like a P0601, just bizarre behavior. We swapped in a VIN-programmed PCM just like this one, and the problem vanished instantly. It’s a classic example of how internal board degradation in these older modules can cause ghost-like issues that even experienced techs can chase for hours. This part was the direct fix.
Is Your Van Exhibiting These Telltale Signs?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, this module is likely the solution you need. Look out for:
- ✔ Check Engine Light (CEL) is on with communication error codes (like U-codes) or internal processor fault codes (P0601, P0606).
- ✔ The engine cranks but refuses to start.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Unexplained drops in fuel economy.
- ✔ Stalling, stumbling, or rough idling for no apparent reason.
- ✔ Failure to pass state emissions testing.
- ✔ Security light is on, and the vehicle’s anti-theft system prevents starting.
A Straightforward Guide to Installation
Replacing your 1998-1999 Express 2500 PCM is a job most DIYers can handle with basic tools. Because we program it beforehand, you won’t need any special scanners.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to allow capacitors to discharge.
- Locate the PCM: On most Express and Savana vans, the PCM is located in the engine compartment on the driver’s side, near the battery or firewall.
- Disconnect the Connectors: Carefully unclip and remove the electrical wiring harness connectors. These connectors have locking tabs, so be gentle to avoid breaking them.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. It’s typically held in by a few bolts or nuts.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and secure it.
- Reconnect Everything: Firmly plug the wiring harness connectors back into the new PCM until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn (If Needed): In some cases, a simple 10-minute key-on/key-off procedure is needed for the security system to sync. We provide easy instructions for this. Start the vehicle and enjoy restored performance!
Verified Compatibility for a Wide Range of GM Vehicles
This module, identified by service number 16258815 or ID 09355699, is a direct replacement for a vast array of GM trucks and vans from the late 1990s. Please verify your part number or consult the list below. This part fits:
- Cadillac Escalade: 1999
- Chevrolet Astro Van: 1998
- Chevrolet Blazer S10: 1998
- Chevrolet Express Van (1500/2500/3500): 1998-1999
- Chevrolet Pickup (1500/2500/3500): 1998-1999
- Chevrolet S10 Pickup: 1998
- Chevrolet Suburban (1500/2500): 1998-1999
- Chevrolet Tahoe: 1998-1999
- GMC Envoy: 1998
- GMC Jimmy S15: 1998
- GMC Safari Van: 1998
- GMC Savana Van (1500/2500/3500): 1998-1999
- GMC Sierra/Pickup (1500/2500/3500): 1998-1999
- GMC Sonoma: 1998
- GMC Yukon: 1998-1999
- Isuzu Hombre: 1998
- Oldsmobile Bravada: 1998
This reliable, tested, and pre-programmed 1998-1999 Express 2500 PCM is your path to a lasting repair. Don’t let a faulty computer keep your vehicle down. Order today and restore its performance and your peace of mind.
Frequently Asked Questions
How do I provide my VIN?
After you complete your purchase, you will receive an email with instructions on where to send your vehicle’s 17-digit VIN. You can also add it to the ‘notes’ section during checkout. We cannot program or ship the module without it.
Is this a new part?
No, this is a thoroughly tested, genuine OEM part sourced from a salvaged vehicle. This ensures OEM quality and fitment at a fraction of the cost of a new dealer part. We then load it with the latest GM software for your specific VIN.
Will I need to do anything else after installation?
For most vehicles, it is a direct plug-and-play installation. Some GM vehicles with Passlock or VATS security systems may require a simple security relearn procedure, which involves turning the key on for 10 minutes. We provide clear instructions for this easy process.
Does this PCM come with a warranty?
Yes, all of our pre-programmed modules come with a warranty. Please see the warranty tab on this page for specific details and duration. We stand behind our parts and programming service.
How do I know this will fit my vehicle?
The best way to ensure compatibility is to match the part number (16258815 or one of the alternates like 09355699) from your original PCM. Our fitment list is highly accurate, but providing your VIN for programming is the final check that guarantees it will work for your specific vehicle configuration.