Get Your Workhorse Van Back on the Job with a Reliable, Programmed PCM
As a technician with over two decades of experience under the hood, I know how frustrating a dead or malfunctioning vehicle can be—especially a work van like the GMC Savana 3500. When your van is down, your business is down. Often, the culprit for baffling issues like intermittent stalling, no-start conditions, or erratic transmission behavior isn’t a bad sensor or a failing fuel pump; it’s the brain of the operation, the Powertrain Control Module (PCM). This isn’t just a replacement part; it’s a direct solution, programmed specifically for your van to get you back on the road with confidence.
This is a thoroughly tested, genuine GM engine computer that we program with the latest official software updates using your vehicle’s VIN. This critical step ensures all engine and transmission parameters are perfectly matched to your 1998-1999 Savana 3500 PCM, often correcting drivability issues that may have existed from the factory. You get a reliable, OEM part without the high cost and hassle of a dealership visit for programming.
A Technician’s Notebook: The Ghost in the Machine
I remember a fleet customer with a ’99 Express 3500—identical to the Savana—that was driving his mechanics crazy. The van would randomly refuse to start, but only when warm. They had replaced the battery, starter, and crank sensor. When it finally got towed to my bay, I saw no spark and no fuel injector pulse. A quick scan with a capable tool revealed the dreaded P0601 code: ‘Internal Control Module Memory Check Sum Error.’ The original PCM was failing internally. We installed one of our VIN-programmed modules, performed the security relearn, and the van fired up instantly. It’s a classic failure on these workhorses, and a programmed module is the fastest, most reliable fix.
Is Your Van Showing These Signs of PCM Failure?
A failing PCM can cause a wide range of symptoms that can be mistaken for other problems. If you’re experiencing any of the following, your engine computer could be the root cause:
- ✔ Check Engine Light is on with communication-related Diagnostic Trouble Codes (DTCs) like P0601, P0602, or P0605.
- ✔ The engine cranks but will not start (no spark or no fuel injector pulse).
- ✔ Your vehicle stalls unexpectedly, either while driving or at idle.
- ✔ Noticeably poor fuel economy and engine performance.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass an emissions test due to module communication errors.
A Straightforward Guide to Installation
Installing your new PCM is a manageable job for a DIYer with basic tools. The key is taking your time and performing the security relearn procedure afterward.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most 1998-1999 Savana and Express vans, the PCM is located in the engine compartment, on the driver’s side, near the firewall or master cylinder.
- Disconnect Connectors: Carefully unclip and remove the electrical connectors from the old PCM. There are typically two or three large connectors with locking tabs. Inspect them for any corrosion or damage.
- Swap the Modules: Unbolt and remove the old PCM from its mounting bracket. Install the new, pre-programmed module in its place.
- Reconnect Everything: Securely plug the electrical connectors into the new PCM until they click. Reconnect the negative battery terminal.
- Perform Security Relearn (Crucial Step): Your van will not start until you complete the GM Passlock/VATS security relearn. This simple procedure involves cycling the key and typically takes about 30 minutes. Instructions are widely available online or in service manuals.
Verified Fitment for Your GM Truck or Van
This PCM, identified by service numbers like 16250279 and ID 9355699, is a direct replacement for a wide range of GM vehicles. While this listing is for the 1998-1999 Savana 3500 PCM, it also fits the following models. Always match your part number or the ID ‘9355699’ to ensure compatibility.
- ✔ Chevrolet Express & GMC Savana Vans (1500, 2500, 3500) – 1998-1999
- ✔ Chevrolet & GMC Pickups (1500, 2500, 3500) – 1998-1999
- ✔ Chevrolet Tahoe & GMC Yukon – 1998-1999
- ✔ Chevrolet Suburban (1500, 2500) – 1998-1999
- ✔ Cadillac Escalade – 1999
- ✔ Chevrolet Astro & GMC Safari – 1998
- ✔ S-10, S-15, Sonoma, Blazer, Jimmy, Bravada, Envoy, Hombre – 1998 (4.3L)
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming for you. Simply provide your vehicle’s 17-digit VIN during or after checkout, and we will flash the module with the latest GM software for your specific vehicle before it ships. It arrives ready for installation.
Is this a new part?
No, this is a high-quality, tested computer that was sourced from a salvaged vehicle. We find these OEM units to be highly reliable, and by programming them with current software, they provide excellent performance and value.
What is the security relearn procedure?
It’s a required step that syncs the new PCM to your vehicle’s anti-theft system. It’s a simple procedure that involves turning the key to ‘ON’ for 10 minutes, ‘OFF’ for 10 seconds, and repeating this two more times. Your van will not start until this is completed.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM also controls transmission functions, including shift points and line pressure. If the original PCM has failed, it can cause poor shifting. This programmed module restores those factory settings.
What information do you need from me?
After you place your order, we just need your vehicle’s complete VIN. This allows us to access the correct GM calibration file to ensure your engine, transmission, and all emissions components function as intended.