Restore Peak Performance to Your GM Truck or Van
Is your Chevrolet S10, GMC Sonoma, or another trusty GM vehicle acting up? If you’re dealing with a persistent Check Engine Light, frustrating stalling, rough idling, or poor fuel economy, the problem often traces back to a failing Powertrain Control Module (PCM). As the ‘brain’ of your vehicle, the PCM controls everything from fuel injection and ignition timing to transmission shift points. When it falters, the entire vehicle’s performance suffers. This isn’t just an annoyance; it can lead to failed emissions tests and leave you stranded.
This isn’t just another part. This is a complete, ready-to-install solution. We take the guesswork and the expensive trip to the dealership out of the equation. By providing us with your vehicle’s VIN at checkout, you’ll receive a PCM that is professionally programmed with the very latest GM factory software specific to your truck or van. This ensures all systems communicate correctly, restoring the smooth, reliable operation you depend on.
From the Diagnostic Bay: The Intermittent Stall Case
I remember a 1999 GMC Jimmy with the 4.3L V6 that came into my shop. The owner was at his wit’s end. The truck would run fine for days, then suddenly stall at a stoplight and refuse to restart for 10-15 minutes. No consistent codes were stored, just a history of random communication errors. After checking all the usual suspects—fuel pressure, ignition components, grounds—we hooked up a scope to the PCM’s power and ground circuits. During a test drive, we finally caught it: a momentary internal voltage drop inside the PCM itself, just before a stall. This is a classic sign of failing solder joints on the main board, a common issue on these units after 20+ years of heat cycles and vibration. A new, correctly programmed 1998-2000 S10 Sonoma PCM like this one was the definitive fix.
Is Your Truck Showing These Telltale Signs?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your engine computer needs attention:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Engine cranks but will not start
- ✔ Unexplained stalling or rough idling
- ✔ Noticeable decrease in fuel mileage
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Failed emissions test
- ✔ Diagnostic Trouble Codes (DTCs) stored, such as P0601, P0604, P0605, or U-series communication codes.
- ✔ Loss of communication with the module when using a scan tool
Your Straightforward PCM Installation Guide
One of the best features of this module is its simple installation process. With our VIN programming service, you can do this job right in your driveway.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most S10/Sonoma/Blazer models, the PCM is located in the engine bay on the front right (passenger) side, near the firewall or fender. On full-size trucks and vans, it’s often on the left (driver) side fender or under the battery tray.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed PCM into place. Securely reconnect the electrical harnesses, ensuring they click into place.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: You will need to perform a simple security relearn procedure (also known as a Passlock or anti-theft relearn) so the vehicle recognizes the new PCM. This typically involves turning the key to ‘ON’ for 10 minutes, ‘OFF’ for 10 seconds, and repeating this cycle three times. Your vehicle’s service manual will have the exact steps.
Verified Vehicle Compatibility List
This module is a direct replacement for part numbers 16263494, 16265035, 8162634940, and 218-11787. It is confirmed to fit the following vehicles. Please match your part number or vehicle to ensure correct fitment.
CHEVROLET 2500 PICKUP 00 Electronic Control Module; gasoline (LH front engine compartment)
EXPRESS 1500 VAN 00-02 Electronic Control Module; (LH rear engine compartment)
EXPRESS 2500 VAN 00-02 Electronic Control Module; (LH rear engine compartment), gasoline
EXPRESS 3500 VAN 00-02 Electronic Control Module; (LH rear engine compartment), gasoline
SAVANA 1500 VAN 00-02 Electronic Control Module; (LH rear engine compartment)
ASTRO 99-01 Electronic Control Module; (LH front by battery), (4.3L), ID 16263494
GMC 3500 PICKUP 00 Electronic Control Module; gasoline (LH front engine compartment)
S10/S15/SONOMA 98-00 Electronic Control Module; (RH front engine compartment), 4.3L
ISUZU HOMBRE 98-00 Electronic Control Module; (RH front engine compartment), 4.3L
SAFARI (GMC) 99-01 Electronic Control Module; (LH front by battery), ID 16263494
SAVANA 3500 VAN 00-02 Electronic Control Module; (LH rear engine compartment), gasoline
GMC 1500 PICKUP 99 Electronic Control Module; 5.0L or 5.7L, (LH engine compartment), ID 16263494
BLAZER S10/JIMMY S15 98-00 Electronic Control Module; (RH front engine compartment)
TAHOE/YUKON 99-00 Electronic Control Module; (LH engine compartment), including Classic & Denali
ESCALADE 99-00 Electronic Control Module; (LH front engine compartment)
BRAVADA 98-00 Electronic Control Module; (RH front engine compartment), 4.3L
ENVOY 98-00 Electronic Control Module; (RH front engine compartment)
SIERRA/SILVERADO 1500 PICKUP 99-00 Electronic Control Module; (LH front under battery), 6 cylinder
SUBURBAN 1500/2500 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
CHEVROLET/GMC 3500 PICKUP 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
And many more models from 1998-2002. Please verify your part number.
Frequently Asked Questions
Do I need to get this PCM programmed by a dealer?
No. We program the module to your vehicle’s specific VIN before we ship it to you. This makes it a plug-and-play part, though you will need to perform a simple security relearn procedure after installation.
What information do you need from me?
After you complete your purchase, you will need to provide us with your 17-digit Vehicle Identification Number (VIN). This is essential for us to load the correct GM software for your vehicle’s specific configuration.
Where is the PCM located on my 1999 Chevy S10?
On the 1998-2000 S10, Sonoma, Blazer, and Jimmy, the PCM is typically found in the engine compartment on the passenger side, mounted near the firewall or inner fender.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls the electronic solenoids in the automatic transmission. If the module is failing, it can cause hard shifts, delayed shifting, or hunting for gears. Replacing a faulty PCM often resolves these issues.
What is the security relearn procedure?
It’s a simple process that syncs the new PCM with your vehicle’s anti-theft system. It usually involves cycling the ignition key on and off in a timed sequence. The process takes about 30 minutes and requires no special tools.
Is this a reliable, long-term fix?
Absolutely. This module is built to meet or exceed original equipment specifications and is loaded with the latest stable software from GM, addressing many of the common failure points of the original units.