Restore Peak Performance to Your GM Vehicle
Is your truck or SUV suffering from frustrating issues like a persistent check engine light, erratic shifting, stalling, or a complete no-start condition? Before you spend a fortune at the dealership, consider the root cause. The Powertrain Control Module (PCM) is the brain of your vehicle’s engine and transmission, and when it fails, it can create a cascade of problems. This reliable, tested, and pre-programmed PCM is the definitive solution to get your vehicle running smoothly again.
We take the guesswork and high cost out of the repair. This is a genuine, used OEM module sourced from a salvaged vehicle, ensuring factory-level compatibility. The real value comes from our expert programming service. Simply provide your vehicle’s VIN at checkout, and we will flash the module with the latest GM software updates specific to your truck or SUV. This means no expensive trips to the dealer for programming—it arrives at your door ready for installation. This is the most efficient and cost-effective way to fix your vehicle right.
Common Signs of a Failing PCM
If you’re experiencing any of the following, a faulty engine computer could be the culprit. I’ve seen these symptoms countless times in my 20+ years in the shop, often misdiagnosed as other, more expensive parts.
- ✔ Unexplained Check Engine Light (CEL) illumination.
- ✔ Stored diagnostic trouble codes (DTCs) like P0601, P0605, or P0606 pointing to internal module failure.
- ✔ Engine stalling, sputtering, or refusing to start.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass state emissions testing.
- ✔ Intermittent electrical issues that seem to have no other cause.
A Technician’s Notebook
A customer brought in a ’98 GMC Jimmy S15 with the 4.3L, a vehicle that shares this exact PCM with the Envoy. The complaint was a classic intermittent no-start. They had already replaced the fuel pump on a friend’s advice, but the problem persisted. When it wouldn’t start, there was no spark and no fuel injector pulse. After confirming all power and grounds to the PCM were good, we suspected the module itself. A quick swap with this programmed unit, followed by a simple security relearn, and the truck fired up instantly, every time. The original PCM had a failing driver circuit that would die when it got warm. This saved the customer from chasing phantom issues and hundreds more in diagnostic fees.
A Straightforward Guide to Installation
Replacing the PCM on these GM vehicles is a job most DIYers can handle in under an hour with basic hand tools. Our pre-programming service eliminates the most difficult step.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most of these trucks and SUVs, the PCM is located in the engine bay, often on the driver’s or passenger’s side fender well or near the battery. It’s a silver metal box with several large wiring harness connectors.
- Disconnect the Harnesses: Carefully unclip and remove all electrical connectors from the old PCM. These connectors have locking tabs that need to be released. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Bolt your new, pre-programmed PCM into the mounting bracket. Reconnect all wiring harnesses, ensuring they click securely into place.
- Reconnect the Battery: Reattach the negative battery terminal.
- Perform Security Relearn (If Necessary): Many of these GM vehicles require a simple, no-tool security relearn procedure to sync the new PCM with the vehicle’s anti-theft system. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. We will include specific instructions for your vehicle if required.
Verified Vehicle Compatibility
This PCM, identified by service number 16258815 and interchange ID 09355699, is a direct replacement for a wide range of GM trucks, vans, and SUVs. Please verify your part number or contact us with your VIN to ensure perfect compatibility. This module fits the following vehicles with the specified options:
Blazer S10/Jimmy S15 (1998): RH front engine compartment, w/o build date opt ZN4, ID 9355699
Bravada (1998): 4.3L, w/o build date opt ZN4, ID 9355699
Envoy (1998): RH front engine compartment, w/o build date opt ZN4, ID 9355699
Escalade (1999): LH front engine compartment, ID 9355699
Hombre (1998): 4.3L, w/o extended build date opt ZN4, ID 9355699
S10/S15/Sonoma (1998): 4.3L, w/o build date opt ZN4, ID 9355699
Chevrolet/GMC 1500/2500/3500 Pickups (1998-1999): Gasoline, LH engine compartment, ID 9355699
Suburban 1500/2500 (1998-1999): Gasoline, LH front engine compartment, ID 9355699
Tahoe/Yukon (1998-1999): Gasoline, LH engine compartment, ID 9355699
Express/Savana 1500/2500/3500 Vans (1998-1999): Gasoline, ID 9355699
Why do you need my VIN?
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential. It allows us to access the exact GM factory calibration file for your vehicle’s specific engine, transmission, and options. We program the PCM with this data and the latest software updates, ensuring it works perfectly right out of the box.
Is this a new part?
No, this is a high-quality, tested, used OEM (Original Equipment Manufacturer) part that was sourced from a salvaged vehicle. This provides the reliability of a genuine GM part at a fraction of the cost of a new one.
Will I need any other programming after installation?
No additional programming is required. Because we flash the module with your VIN, it’s ready to go. You may need to perform a simple security relearn procedure, which takes about 10-15 minutes and requires no special tools. Instructions are included if necessary.
How do I find my original part number?
Your original part number is printed on a sticker on your current PCM. It will typically be a large 8-digit number. This module is a direct replacement for part numbers 16258815, 09355699, 16266645, 16250279, and 09366810.