Restore Peak Performance to Your GM Truck or Van
If you’re dealing with frustrating, hard-to-diagnose issues on your 1998 GMC Savana 1500 Van or another compatible GM vehicle, the problem often traces back to one critical component: the Powertrain Control Module (PCM). As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing PCM can cause a cascade of problems, from a simple Check Engine Light to a vehicle that won’t start at all. This isn’t just a part; it’s the central computer for your engine and transmission, and when it falters, your vehicle’s reliability and performance suffer.
This replacement Powertrain Control Module, service number 09366810, is the definitive solution. We take the guesswork and hassle out of the repair by programming the module specifically for your vehicle using your VIN. This means it arrives loaded with the latest GM factory software updates, ensuring optimal fuel delivery, ignition timing, and transmission shift points. You get a part that’s ready to install right out of the box, saving you a costly trip to the dealership for programming.
A Technician’s Notebook
I remember a 1999 GMC Sierra 1500 that came into the shop on a tow truck. The owner had replaced the fuel pump, crank sensor, and ignition coil, but it still wouldn’t start—it had spark and fuel pressure, but no injector pulse. A scan tool showed no communication with the PCM. After verifying power and ground to the module were good, we knew the PCM itself was the culprit. A new, programmed module like this one had it running perfectly in under an hour. This is a classic example of how a faulty 1998 Savana 1500 PCM (or its equivalent in other models) can mimic other failures, costing you time and money on unnecessary parts.
Is Your GM Truck or Van Showing These Signs?
A failing PCM can manifest in various ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs attention:
- ✔ Check Engine Light is on with communication error codes (like U-codes) or internal module failure codes (P0601, P0605, P0606).
- ✔ The engine cranks but refuses to start.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A noticeable drop in fuel economy for no apparent reason.
- ✔ Stalling, rough idling, or misfiring.
- ✔ Failure to pass an emissions or smog test.
A Straightforward Guide to Installation
Replacing the PCM is a manageable job for a DIY enthusiast. Since we handle the programming, your main job is the physical swap. Always consult a service manual for your specific vehicle, but here is a general guide:
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most of these GM trucks and vans, the PCM is located in the engine bay, typically on the driver’s or passenger’s side fender well or near the battery.
- Disconnect the Harnesses: Carefully unclip and remove the electrical wiring harnesses connected to the old module. These connectors have locking tabs that need to be released gently.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware as you will need it for the new module.
- Install the New Module: Mount your new, pre-programmed 1998 Savana 1500 PCM and securely reconnect the wiring harnesses. Ensure they click into place.
- Reconnect the Battery: Reattach the negative battery terminal.
- Perform Security Relearn: Your vehicle may require a security relearn procedure to recognize the new PCM. This can often be done without special tools (e.g., turning the key to ‘ON’ for 10-15 minutes). Check your vehicle’s specific procedure.
Will This Fit My Vehicle?
This module is a direct replacement for service numbers 16250279, 09366810, and 09355699. It is guaranteed to fit the following vehicles with the specified options. Please verify your original part ID to ensure compatibility.
BLAZER S10/JIMMY S15 98 (RH front engine compartment), w/o build date opt ZN4; ID 16250279 or 16258815
BRAVADA 98 (6-262, 4.3L), w/o build date opt ZN4; ID 16250279 or 16258815
CHEVROLET 1500 PICKUP 98-99 (Gasoline, LH engine compartment), ID 16250279
CHEVROLET 2500 PICKUP 98-99 (Gasoline, LH front engine compartment), ID 16250279
CHEVROLET 3500 PICKUP 98-99 (Gasoline, LH front engine compartment), ID 16250279
ENVOY 98 (RH front engine compartment), w/o build date opt ZN4; ID 16250279 or 16258815
ESCALADE 99 (LH front engine compartment), ID 16250279
EXPRESS 1500/2500/3500 VAN 98 (Gasoline), ID 16250279
GMC 1500 PICKUP 98-99 (Gasoline, LH engine compartment), ID 16250279
GMC 2500 PICKUP 98-99 (Gasoline, LH front engine compartment), ID 16250279
GMC 3500 PICKUP 98-99 (Gasoline, LH front engine compartment), ID 16250279
ISUZU HOMBRE 98 (4.3L), w/o extended build date opt ZN4; ID 16258815
S10/S15/SONOMA 98 (4.3L), w/o build date opt ZN4; ID 16250279 or 16258815
SAFARI (GMC) 98-99 (LH front by battery), ID 16250279
SAVANA 1500/2500/3500 VAN 98 (Gasoline), ID 16250279
SUBURBAN 1500/2500 98-99 (Gasoline, LH front engine compartment), ID 16250279
TAHOE 98-99 (Gasoline, LH engine compartment), ID 16250279
YUKON 98-99 (LH engine compartment), ID 16250279
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to load the exact, correct software calibration for your vehicle’s specific engine, transmission, and options. This ensures perfect compatibility and performance, just like a part from the original factory.
Is any additional programming needed after installation?
No, this module comes fully programmed and ready to install. However, depending on your vehicle, you may need to perform a simple security relearn procedure (often called Passlock or VATS relearn) and a Crankshaft Variation Relearn (CASE relearn). The CASE relearn requires a capable scan tool, but the vehicle will typically run and drive without it, though a Check Engine Light may be present until it’s completed.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls transmission line pressure and shift solenoids. If the module is faulty, it can cause hard shifts, delayed shifting, or slipping. A new, correctly programmed PCM restores proper communication and control to the transmission.
How do I find my part number?
The original part number is printed on a sticker on the case of your current PCM. You will need to locate and remove the module to read it. Match it to one of the compatible numbers listed: 16250279, 09366810, or 09355699.
Is this a reliable, long-term fix?
Absolutely. We use high-quality components and load the latest stable software from GM. This provides a durable and dependable solution to restore your vehicle’s engine management system to its correct operating condition.