Restore Your Truck’s Brain and Get Back on the Road
Is your 1998-1999 Chevy Tahoe or other GM truck giving you headaches? Unexplained stalling, a persistent Check Engine Light, rough idling, or erratic transmission shifting can often be traced back to a single, critical component: the Powertrain Control Module (PCM). As an experienced technician, I’ve seen countless vehicles sidelined by a failing PCM. It’s the computer that manages everything from fuel mixture to spark timing, and when it falters, your vehicle’s performance and reliability suffer.
This isn’t just another used part. This is a dependable, OEM engine computer, meticulously tested and prepared to solve your vehicle’s issues. The biggest challenge with replacing a PCM is the expensive and time-consuming programming required at a dealership. We eliminate that step entirely. By providing us with your Vehicle Identification Number (VIN) after purchase, we will flash this PCM with the latest official GM software updates specific to your truck. This ensures optimal performance, fuel efficiency, and a seamless installation process. This is the smart, cost-effective solution to get your trusted GM vehicle running like it should.
A Technician’s Notebook
I remember a ’99 Suburban that came into the shop with a ghost of a problem. The owner said it would run fine for days, then suddenly stall at a stoplight and refuse to restart for 20 minutes. No consistent codes, just frustration. After checking fuel pressure and ignition components, which were all fine, we focused on the PCM. On these GMT400 platforms, heat soak can degrade internal connections over time. We swapped in one of our VIN-programmed PCMs, and the problem vanished instantly. The customer was thrilled to have a reliable truck again without a massive dealership bill. This pre-programmed 1998-1999 Tahoe PCM offers that same straightforward, proven fix.
Is Your GM Truck Showing These Signs of a Bad PCM?
- ✔ Your vehicle cranks but refuses to start.
- ✔ The engine stalls intermittently, especially after warming up.
- ✔ You’re experiencing a noticeable drop in fuel economy.
- ✔ The transmission is shifting harshly or at the wrong times.
- ✔ The Check Engine Light is on with codes like P0601, P0602, or P0605 (Internal Control Module Errors).
- ✔ Your vehicle fails an emissions test due to communication errors.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- ✔ Locate the PCM: On most compatible trucks and vans (like the Tahoe, Suburban, and Express), the PCM is located in the engine bay, typically on the driver’s side fender.
- ✔ Disconnect Connectors: Carefully unclip and remove the wiring harness connectors from the old PCM. There are usually multiple color-coded connectors; they only fit one way, so you can’t mix them up.
- ✔ Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- ✔ Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely re-fasten the bolts.
- ✔ Reconnect Everything: Plug the wiring harness connectors firmly into the new module. Reconnect the negative battery terminal.
- ✔ Perform Security Relearn: Your vehicle’s anti-theft system (PassLock/VATS) needs to sync with the new PCM. Turn the key to the ‘ON’ position (don’t start) for 10-15 minutes, or until the ‘Security’ light on the dash stops flashing and turns off. Turn the key off for 10 seconds, then start the engine. Your vehicle is ready to drive!
Verified Vehicle Compatibility
This 1998-1999 Tahoe PCM is a direct replacement for service number 09366810 and is interchangeable with part numbers 09355699, 16266645, 16250279, and 16258815. It is guaranteed to fit the following vehicles with matching options. Please verify your part number or consult the list below:
BLAZER S10/JIMMY S15 98: Electronic Control Module; (RH front engine compartment), w/o build date opt ZN4; ID 9355699
BRAVADA 98: Electronic Control Module; (6-262, 4.3L), w/o build date opt ZN4; ID 9355699
CHEVROLET 1500 PICKUP 98-99: Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
CHEVROLET 2500 PICKUP 98-99: Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
CHEVROLET 3500 PICKUP 98-99: Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
ENVOY 98: Electronic Control Module; (RH front engine compartment), w/o build date opt ZN4; ID 9355699
ESCALADE 99: Electronic Control Module; (LH front engine compartment), ID 9355699
EXPRESS 1500 VAN 98-99: Electronic Control Module; ID 9355699
EXPRESS 2500 VAN 98-99: Electronic Control Module; gasoline, ID 9355699
EXPRESS 3500 VAN 98-99: Electronic Control Module; gasoline, ID 9355699
GMC 1500 PICKUP 98-99: Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
GMC 2500 PICKUP 98-99: Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
GMC 3500 PICKUP 98-99: Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
ISUZU HOMBRE 98: Electronic Control Module; 4.3L (6 cylinder), w/o extended build date opt ZN4; ID 9355699
S10/S15/SONOMA 98: Electronic Control Module; 6-262 (4.3L), w/o build date opt ZN4; ID 9355699
SAFARI (GMC) 98: Electronic Control Module; (LH front by battery), ID 9355699
SAVANA 1500 VAN 98-99: Electronic Control Module; ID 9355699
SAVANA 2500 VAN 98-99: Electronic Control Module; gasoline, ID 9355699
SAVANA 3500 VAN 98-99: Electronic Control Module; gasoline, ID 9355699
SUBURBAN 1500 98-99: Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
SUBURBAN 2500 98-99: Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
TAHOE 98-99: Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
YUKON 98-99: Electronic Control Module; (LH engine compartment), ID 9355699
Frequently Asked Questions
How does the VIN programming work?
After you complete your purchase, simply send us your 17-digit VIN. We use this number to access the official GM database and flash the PCM with the exact software and latest updates for your vehicle’s specific configuration. This makes the unit ready for installation right out of the box.
Is this a new part?
No, this is a thoroughly tested, genuine OEM part sourced from a salvaged vehicle. We inspect and verify the function of each unit to ensure it meets operational standards, providing a reliable and affordable alternative to a new, expensive module.
Do I need any special tools to install this?
No special tools are required. Basic hand tools, such as a socket set to remove the mounting bolts and disconnect the battery, are all you need. The most important step is the security relearn procedure, which only requires using your ignition key.
What is the security relearn procedure?
It’s a simple process to sync the new PCM with your vehicle’s anti-theft system. After installing the PCM, you’ll turn the ignition key to ‘ON’ for about 10-15 minutes until the security light goes out. This tells the vehicle to accept the new component. Full instructions are provided above.
Will this fix my Check Engine Light?
If the Check Engine Light is caused by an internal PCM failure (like code P0601), then yes, this part will resolve the issue. However, if the light is on for another reason (e.g., a bad oxygen sensor), that separate issue will still need to be addressed. This module will fix all problems related to the computer itself.