Restore Your Van’s Core Performance and Reliability
Is your trusty GMC Savana or Chevrolet Express van suddenly acting up? If you’re dealing with frustrating issues like a persistent check engine light, rough idling, erratic transmission shifting, or even a no-start condition, the problem often lies with a failing Powertrain Control Module (PCM). As the central computer of your vehicle, a faulty PCM can cause a cascade of confusing problems, making your workhorse feel unpredictable. This replacement module, part number 09366810, is the definitive solution to bring back the smooth, dependable performance you rely on every day.
We take the guesswork out of the repair. Before this unit ships, we flash it with the latest official GM software updates, precisely programmed to your vehicle’s specific Vehicle Identification Number (VIN). This critical step ensures seamless communication between all your vehicle’s systems, just like the original part from the factory. Get ready to regain that worry-free drive and the confidence that your van will start and run right every single time.
An Expert’s Diagnostic Tale
I once had a 1999 GMC Sierra in the shop with a harsh 1-2 shift that felt like getting rear-ended. The owner had already replaced the transmission solenoids and fluid, with no change. We checked pressures and wiring for hours. Finally, on a hunch, we connected a scope to the PCM’s transmission control circuits. We found the signal for the shift solenoid was weak and erratic. A new, properly programmed PCM fixed it instantly. It’s a powerful reminder that the computer’s health is just as critical as the mechanical parts it controls.
Is Your Vehicle Showing These Symptoms?
- ✔ Persistent and illuminated Check Engine Light (CEL).
- ✔ Diagnostic Trouble Codes (DTCs) like P0601, P0605, or P0606 pointing to internal module failure.
- ✔ Unexplained drops in fuel economy.
- ✔ The engine cranks but refuses to start.
- ✔ Harsh, delayed, or unpredictable automatic transmission shifts.
- ✔ Stalling, stumbling, or rough running conditions.
- ✔ Failure to pass state emissions testing.
Guided Installation for a Confident Fix
Replacing your PCM is a straightforward job you can tackle with basic hand tools. Follow these steps to get your vehicle back on the road quickly.
- Safety First: Always begin by disconnecting the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the Module: On most of these GM trucks and vans, the PCM is located in the engine compartment, typically on the driver’s side near the battery or firewall.
- Disconnect Wiring: Carefully unplug the electrical connectors from the old module. There are usually release tabs that need to be pressed or lifted. Avoid pulling on the wires themselves.
- Remove the Old PCM: Unbolt the mounting hardware holding the old PCM in place and remove it from the vehicle.
- Install the New PCM: Mount your new, pre-programmed module in the same location and secure it with the original hardware.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new PCM until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn (If Needed): In some cases, you may need to perform a simple security or anti-theft relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Consult your owner’s manual for the specific steps for your vehicle.
Tailored Fit for Your GM Truck or Van
This module is a direct replacement for service numbers 09366810, 16250279, and 09355699. Please verify your part number and check the compatibility list below to ensure a perfect fit for your vehicle.
Cadillac:
- ESCALADE 99 (LH front engine compartment)
Chevrolet / GMC Trucks & SUVs:
- BLAZER S10/JIMMY S15 98 (RH front engine compartment)
- CHEVROLET/GMC 1500 PICKUP 98-99 (Gasoline, LH engine compartment)
- CHEVROLET/GMC 2500 PICKUP 98-99 (Gasoline, LH front engine compartment)
- CHEVROLET/GMC 3500 PICKUP 98-99 (Gasoline, LH front engine compartment)
- ENVOY 98 (RH front engine compartment)
- S10/S15/SONOMA 98 (4.3L, RH front engine compartment)
- SUBURBAN 1500/2500 98-99 (Gasoline, LH front engine compartment)
- TAHOE/YUKON 98-99 (Gasoline, LH engine compartment)
Chevrolet / GMC Vans:
- ASTRO 98-99 (LH front by battery)
- EXPRESS/SAVANA 1500, 2500, 3500 VAN 98 (Gasoline)
Oldsmobile / Isuzu:
- BRAVADA 98 (4.3L, RH front engine compartment)
- ISUZU HOMBRE 98 (4.3L, RH front engine compartment)
Your Questions Answered
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential because it allows us to load the exact, correct software calibration from GM for your vehicle’s specific engine, transmission, and emissions equipment. This ensures a perfect match and avoids compatibility issues.
Is this part truly plug-and-play?
Yes, it arrives ready to install. Because it’s programmed to your VIN, no further dealer flashing is required. However, some GM vehicles require a simple ‘security relearn’ procedure after installation, which you can do yourself in about 15 minutes with just the ignition key.
Will this fix my check engine light?
If the check engine light is on due to an internal failure of the old PCM (common codes are P0601-P0606), then this part is the correct fix. If the light is on for another reason, like a faulty sensor, this will not resolve that separate issue.
Where is the 1998 Savana 1500 PCM located?
On the 1998 GMC Savana 1500, the Powertrain Control Module is typically found in the engine bay, mounted on the driver’s side inner fender, near the battery and fuse box.
What tools are needed for the installation?
You’ll only need basic hand tools. A socket set with an extension (commonly 10mm) to remove the mounting bolts and a flathead screwdriver to help with the connector tabs are usually all that’s required for the job.