Is Your GM Truck or Van Running Rough?
If your 1998-1999 GMC Savana, Chevy Express, or another compatible GM vehicle is suffering from mysterious engine problems, a failing Powertrain Control Module (PCM) is a likely culprit. This central computer is the brain of your vehicle’s engine and transmission, controlling everything from fuel mixture and ignition timing to shift points. When it fails, it can cause a wide range of frustrating and difficult-to-diagnose issues that can leave you stranded.
From the Diagnostic Bay
We had a ’99 Chevy Suburban come into the shop with a complaint of intermittent stalling and a persistent Check Engine Light. The owner had already replaced the spark plugs, wires, and even the fuel pump with no success. After hooking up our scanner, we saw erratic data from multiple sensors. Instead of chasing ghosts and replacing perfectly good parts, we checked the power and ground connections to the PCM. They were solid. This pointed us directly to an internal failure of the computer itself. Swapping in a correctly programmed PCM like this one had the truck running perfectly in under an hour, solving a problem that had plagued the owner for months.
Common Symptoms of a Failing PCM
- ✔ Unexplained Check Engine Light with various trouble codes.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Rough idling or inconsistent engine performance.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Poor fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication errors with diagnostic scan tools.
Why Choose Our Pre-Programmed 1998-1999 Savana 1500 PCM?
Don’t settle for a generic, unprogrammed computer that will require an expensive trip to the dealership. We take the guesswork and hassle out of the repair. This is a genuine, used OEM engine computer that has been thoroughly tested and is ready for installation. The key benefit is our professional programming service: we flash the module with the latest official GM software updates specifically for your vehicle using the VIN you provide. This ensures that your vehicle operates exactly as the manufacturer intended, with optimal performance and efficiency. This 1998-1999 Savana 1500 PCM is a direct-fit, reliable solution to get your truck back on the road.
This module is compatible with a wide range of GM trucks, vans, and SUVs from 1998-1999. Please verify your original part number against our cross-reference list (including 09355699, 16266645, 9355699, 16250279) and check the detailed fitment information to ensure compatibility.
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming before we ship the part. Using the Vehicle Identification Number (VIN) you provide at checkout, we load the correct, updated GM software for your specific vehicle. It arrives ready to be installed.
What is a security relearn or CASE relearn?
On many GM vehicles of this era, after installing a new PCM, you may need to perform a simple security relearn procedure so the vehicle recognizes the new computer. This usually involves turning the key on and off in a specific sequence and can be done without special tools. A CASE (Crankshaft Angle Sensor Error) relearn may also be necessary and requires a capable scan tool to complete.
Is this a new part?
No, this is a high-quality, tested used OEM part sourced from a salvaged vehicle. This provides a reliable and cost-effective alternative to sourcing a new, and often unavailable, computer from a dealer.
How do I provide my VIN?
After you complete your purchase, you will need to send us a message with your vehicle’s 17-digit VIN. We cannot program and ship your PCM without this information. Please double-check it for accuracy.
Will this fix my vehicle’s problem?
This PCM will correct issues caused by a faulty engine computer. However, it’s crucial to ensure your vehicle has been properly diagnosed. This part will not fix problems related to bad sensors, wiring issues, or other mechanical failures.