Restore Your Van’s Core Performance and Reliability
Is your GMC Savana van giving you headaches? Unexplained stalling, a persistent check engine light, or erratic engine behavior can often point to one culprit: a failing Powertrain Control Module (PCM). As the central computer of your vehicle, a faulty PCM can disrupt everything from fuel delivery to transmission shifting, making your workhorse unreliable. This isn’t just an inconvenience; it’s a problem that can cost you time and money. We offer a dependable and straightforward solution with this fully tested, used OEM PCM.
The biggest hurdle in replacing a PCM is the programming. A module from another vehicle won’t work without being correctly configured. We eliminate that expensive trip to the dealership. Before we ship your part, our technicians will flash this module with the latest GM software updates, precisely matched to your vehicle’s Vehicle Identification Number (VIN). This means you receive a part that is ready for installation, designed to restore the original performance and efficiency of your van. It’s the most direct path to getting your 1998-1999 Savana 2500 PCM functioning correctly again.
Case Study: A Tricky Diagnosis
A local contractor brought in his ’99 Savana 2500 work van with a frustrating intermittent no-start condition. It would run fine for days, then refuse to start, only to fire up an hour later. No consistent codes were stored, just a random collection of communication errors that would clear. After checking the usual suspects—battery, starter, fuel pump—we focused on the PCM. On these older GM vans, heat soak and vibrations can cause microscopic cracks in the PCM’s circuit board. We connected a scan tool to monitor live data and, during one of the no-start events, we saw the PCM lose communication entirely. Swapping in a VIN-programmed module like this one solved the problem instantly. The contractor was back on the job the next day without having to replace a single extra part.
Is Your Vehicle Showing These Symptoms?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, your engine computer could be the root cause. Look out for Diagnostic Trouble Codes (DTCs) like P0601, P0604, or P0606, which point directly to an internal module fault.
- ✔ Check Engine Light is on with no clear cause.
- ✔ Engine stalls, misfires, or runs rough.
- ✔ Your van won’t start, or has trouble starting intermittently.
- ✔ Decreased fuel economy for no apparent reason.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Failure to pass an emissions test.
- ✔ Loss of communication with the scan tool.
A Straightforward Guide to Installation
Installing your replacement 1998-1999 Savana 2500 PCM is a manageable job for a DIYer or professional mechanic. Since we program it beforehand, you can avoid the complexities of dealer-level software tools.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On the 1998-1999 Savana/Express vans, the PCM is typically located in the engine compartment, on the driver’s side, often near the air filter housing.
- Disconnect the Harnesses: Carefully release the locking tabs and unplug the electrical wiring harnesses from the old PCM. Inspect the connectors for any corrosion or bent pins.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. Keep the hardware as you will need it for the new module.
- Install the New Module: Mount your VIN-programmed PCM onto the bracket and securely tighten the bolts.
- Reconnect Everything: Plug the wiring harnesses back into the new PCM, ensuring they click securely into place. Reconnect the negative battery terminal.
- Perform Security Relearn: In most cases, you will need to perform a security relearn procedure (often called Passlock or VATS relearn) to sync the new PCM with your vehicle’s anti-theft system. This procedure typically involves cycling the key and can be done without special tools.
Verified Vehicle Compatibility
This module, identified by part number 16266645 or service ID 9355699, is a direct fit for a wide range of GM trucks and vans. Please verify your part number or contact us with your VIN to confirm compatibility. This part fits the following vehicles with matching options:
CHEVROLET SUBURBAN 1500/2500 (1998-1999, Gasoline)
GMC YUKON / CHEVROLET TAHOE (1998-1999, Gasoline)
CADILLAC ESCALADE (1999)
CHEVROLET EXPRESS & GMC SAVANA 1500/2500/3500 VANS (1998-1999, Gasoline)
CHEVROLET ASTRO & GMC SAFARI (1998, ID 9355699)
CHEVROLET S10 / GMC SONOMA (1998, 4.3L, w/o opt ZN4)
CHEVROLET BLAZER / GMC JIMMY (1998, w/o opt ZN4)
OLDSMOBILE BRAVADA (1998, w/o opt ZN4)
ISUZU HOMBRE (1998, 4.3L, w/o opt ZN4)
This module interchanges with the following part numbers: 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, 9366810.
Frequently Asked Questions about this 1998-1999 Savana 2500 PCM
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship the module until we receive this information, as the programming is essential for it to function in your van.
Is this a new part?
No, this is a high-quality, tested used OEM part sourced from a salvaged vehicle. Each unit is inspected and verified to be fully functional before being programmed and shipped.
Will I need to do anything else after installation?
After installing the PCM and reconnecting the battery, you will likely need to perform a security relearn procedure. This allows the module to recognize your vehicle’s keys. This process is simple and instructions can be easily found online or in a repair manual for your specific model.
What if my part number isn’t an exact match?
This PCM (service ID 9355699) replaces several part numbers. Please check the compatibility list. If you’re still unsure, contact us with your VIN, and we will verify the correct fitment for your vehicle.
What is the benefit of getting the newest GM updates?
Over the life of a vehicle, manufacturers often release software updates to address common issues, improve transmission shifting, or enhance engine efficiency. By flashing your module with the latest software, you’re getting a part that performs better than the original one that came from the factory.