Restore Your Truck’s Reliability and Performance
Is your Chevrolet or GMC truck suffering from frustrating, hard-to-diagnose issues? A failing Powertrain Control Module (PCM), the vehicle’s central computer, is often the hidden culprit behind problems like intermittent stalling, poor fuel economy, erratic transmission shifting, or a persistent check engine light. This isn’t just an annoyance—it’s a core reliability issue. As a technician with over two decades of experience, I’ve seen countless owners replace sensors and other parts, only to find the root cause was a faulty PCM all along. This module is the direct-fit, dependable solution to get your truck running like it should.
We take the guesswork and hassle out of the repair. Unlike a generic module from a parts store, this PCM comes fully programmed with the latest GM software updates specifically for your vehicle. Simply provide us with your Vehicle Identification Number (VIN) after purchase, and we’ll flash the module before it ships. This means no expensive trips to the dealership for programming—it’s ready for installation right out of the box. This is the most efficient way to replace a faulty 1999 Chevrolet 1500 PCM and restore your engine’s proper function.
A Technician’s Notebook
I remember a 1999 GMC Sierra that came into the shop with a complaint of random stalling at traffic lights and a check engine light that would come and go. The owner had already replaced the throttle position sensor and the idle air control valve, but the problem persisted. A scan showed a P0606 (ECM/PCM Processor Fault) code that would appear intermittently. After verifying the wiring and grounds were solid, we knew the PCM itself was failing internally. We installed a VIN-programmed module just like this one, and the truck ran perfectly. The customer saved hundreds by avoiding a dealership visit and the frustration of chasing the wrong parts.
Is Your Truck Showing These Signs?
A failing PCM can manifest in various ways. If you’re experiencing any of the following, this module is likely the solution you need:
- ✔ Unexplained Check Engine Light (with codes like P0601, P0606)
- ✔ Engine stalling or shutting off while driving
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Noticeable decrease in fuel mileage
- ✔ Engine cranks but refuses to start
- ✔ Communication errors with scan tools
- ✔ Failure to pass an emissions test
A Straightforward Guide to Installation
Installing your new 1999 Chevrolet 1500 PCM is a job most DIYers can handle with basic tools. Since it’s pre-programmed, no special computer equipment is needed.
- 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 vans, the PCM is located in the engine compartment, typically on the driver’s side (LH) near the fender or battery.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old module. There are usually several color-coded connectors; they only fit one way, so you don’t have to worry about mixing them up.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware, as you may need to reuse it.
- Install the New Module: Bolt the new, pre-programmed PCM into place and securely reconnect the wiring harnesses. You should hear a click as they lock in.
- Reconnect the Battery: Reattach the negative battery terminal. The vehicle may need to complete a brief idle relearn procedure, which typically involves starting the engine and letting it idle for a few minutes.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 16263494, 16265035, and 8162634940. It is guaranteed to fit the following vehicles (please verify your specific options):
BLAZER/JIMMY S-SERIES 98-00 (4.3L)
BRAVADA 98-00 (4.3L)
CHEVROLET/GMC 1500/2500/3500 PICKUP 99-00 (Gasoline)
ENVOY 98-00
ESCALADE 99-00
EXPRESS/SAVANA 1500/2500/3500 VAN 99-02 (Gasoline)
ISUZU HOMBRE 98-00 (4.3L)
SAFARI (GMC) 99-01 (4.3L)
SIERRA/SILVERADO 1500 PICKUP 99-00 (4.3L V6)
S10/S15/SONOMA 98-00 (4.3L)
SUBURBAN 1500/2500 99 (Gasoline)
TAHOE 99-00 (Gasoline, Classic Style)
YUKON 99-00 (incl. Denali)
Note: Some 1998 models require build date option ZN4. Always match your part number or contact us with your VIN to confirm.
Frequently Asked Questions about this 1999 Chevrolet 1500 PCM
Frequently Asked Questions
What is VIN programming and why is it important?
VIN programming involves loading your vehicle’s specific software and settings onto the module. This ensures that the engine, transmission, and anti-theft systems all communicate and function correctly. Without it, the vehicle will not start or run properly.
Do I need to send my old module (core) back?
No core charge or return is required for this particular part. You can keep or responsibly dispose of your old module.
Will this fix my check engine light?
If the check engine light is caused by an internal PCM failure (like codes P0601-P0608), then yes, this will resolve the issue. It’s always best to diagnose the code first to ensure the PCM is the root cause.
How long does the installation take?
For someone with basic mechanical skills, the physical swap typically takes between 15 and 30 minutes. Since it’s pre-programmed, there is no additional computer time needed.
Is any other procedure required after installation?
In some cases, a security relearn procedure may be necessary, which can be done without special tools. Instructions are readily available online or in service manuals. It typically involves cycling the ignition key and waiting for a few minutes.