Is your trusty GM truck or van suddenly acting up? Unexplained stalling, a persistent Check Engine Light, or erratic transmission shifts can be incredibly frustrating. As a mechanic with over two decades of experience under the hood, I’ve seen these exact issues hundreds of times. Often, the culprit isn’t a simple sensor—it’s the brain of the operation, the Powertrain Control Module (PCM).
This isn’t just a replacement part; it’s a complete, ready-to-install solution for your vehicle. We take the guesswork and hassle out of the repair by pre-programming this module with the latest GM software updates, flashed specifically to your vehicle’s VIN. This means you get a component that’s not only a direct replacement but also optimized for performance and reliability, often correcting issues the original factory software had. This is the most effective way to restore your vehicle’s engine management system to perfect working order.
From the Diagnostic Bay: The Case of the Ghostly Glitch
I remember a 2000 Chevy Express van that came into my shop with a laundry list of intermittent problems. The owner had replaced the battery, alternator, and multiple sensors, but the van would still randomly lose power and the gauges would go haywire. After hours of chasing wires, we hooked up a high-level scanner and saw communication dropouts with the PCM. It wasn’t setting a hard code every time, but the data was clear. We installed a VIN-programmed 1999 Suburban 2500 PCM (the same family of modules) and after the quick security relearn, the van ran like new. All the ‘ghosts’ were gone. It’s a classic example of how a failing module can mimic a dozen other problems.
Is Your GM Truck or Van Showing These Signs?
A failing PCM can cause a wide range of symptoms. If you’re experiencing any of the following, this module is the likely solution.
- âś” Check Engine Light is on with no clear cause, or for internal module codes like P0601, P0602, or P0606.
- âś” Your vehicle cranks but refuses to start.
- âś” Rough or unpredictable engine idling and stalling.
- âś” Noticeably poor fuel economy and engine performance.
- âś” Harsh or incorrect automatic transmission shifting.
- âś” Failure to pass an emissions (smog) test.
- âś” Loss of communication with the diagnostic scan tool.
A Straightforward Guide to Installation
You don’t need to be a master technician to install this part. Our pre-programming service handles the most complex step. Just follow this simple process.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Old PCM: On most of these trucks and vans, you’ll find the PCM in the engine compartment, typically on the driver’s side fender, near the battery, or mounted to a bracket.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs, so be gentle. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed PCM into place and securely reconnect the wiring harnesses. Ensure they click into place.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: Your vehicle needs to sync with the new PCM. This is a simple ‘key-on’ procedure that typically takes about 30 minutes. We include easy-to-follow instructions for this final step.
Guaranteed Vehicle Compatibility
This module, part number 16263494, is a direct replacement for several other part numbers, including 16265035, 8162634940, 218-11787, and 21811787. It is guaranteed to fit the following vehicles (please verify your specific options):
- ASTRO 99-01 (4.3L)
- BLAZER/JIMMY S-SERIES 98-00 (4.3L)
- BRAVADA 98-00 (4.3L)
- CHEVROLET/GMC 1500 PICKUP 99 (5.0L, 5.7L)
- CHEVROLET/GMC 2500 PICKUP 99-00 (Gasoline)
- CHEVROLET/GMC 3500 PICKUP 99-00 (Gasoline)
- ENVOY 98-00
- ESCALADE 99-00
- EXPRESS/SAVANA 1500 VAN 99-02
- EXPRESS/SAVANA 2500 VAN 99-02 (Gasoline)
- EXPRESS/SAVANA 3500 VAN 99-02 (Gasoline)
- ISUZU HOMBRE 98-00 (4.3L)
- S10/SONOMA 98-00 (4.3L)
- SAFARI (GMC) 99-01 (4.3L)
- SIERRA/SILVERADO 1500 PICKUP 99-00 (4.3L V6)
- SUBURBAN 1500/2500 99 (Gasoline)
- TAHOE 99-00 (Classic Style)
- YUKON 99-00 (Inc. Denali)
Frequently Asked Questions
Frequently Asked Questions
How does the VIN programming work?
After you place your order, simply provide us with your vehicle’s 17-digit VIN. Our technicians will use this to load the correct, factory-updated software for your specific vehicle onto the module before we ship it. This ensures perfect compatibility.
Is this part difficult to install for a DIYer?
Not at all. The physical swap is just a few bolts and connectors. Since we handle the programming, the only remaining step is a simple security relearn procedure that you can do in your driveway with just your key. Instructions are included.
Will this fix my ‘No Communication’ issue with a scan tool?
In many cases, yes. A complete internal failure of the PCM is a common reason why a scan tool cannot communicate with the vehicle’s network. Replacing the module often restores this vital diagnostic link.
Does this part require any additional programming at the dealership?
No. The point of our service is to help you avoid extra costs and trips to the dealer. This module arrives at your door ready for installation and the final security relearn. No other programming is needed.
How do I know if I’m ordering the right part?
Match the part number 16263494 (or one of the alternates listed) from your original module. You can also use our detailed compatibility list. Providing your VIN for programming is the final check that guarantees you receive the correct part for your truck or van.