Restore Peak Performance to Your GM Truck or Van
Is your trusty Chevrolet, GMC, or Isuzu suddenly giving you trouble? If you’re dealing with a persistent check engine light, erratic engine behavior, stalling, or a complete no-start condition, the problem often points directly to the vehicle’s brain: the Powertrain Control Module (PCM). As a technician with over two decades of experience under the hood, I’ve seen how a failing PCM can turn a reliable workhorse into a frustrating driveway ornament. This Programmed PCM 16263494 is the definitive solution to get your vehicle running smoothly and reliably again.
Unlike a standard part off the shelf, this module isn’t just a replacement; it’s a restoration of your vehicle’s core logic. We flash it with the latest official GM software updates, tailored specifically to your vehicle’s VIN. This crucial step ensures that all engine and transmission parameters are set correctly, fixing issues that may have developed from outdated factory software. You get a plug-and-play solution without the expensive trip to the dealership for programming.
From the Diagnostic Bay: The Case of the Stalling Sierra
A customer brought in his ’99 GMC Sierra 1500 with a 4.3L V6. The complaint was intermittent stalling at stoplights and a check engine light that would come and go. He’d already replaced the fuel filter and spark plugs with no luck. My scan tool pulled a P0601 code – Internal Control Module Memory Check Sum Error. This is a dead giveaway for a failing PCM. The internal processors were failing, causing the truck to lose its mind intermittently. We installed a VIN-programmed module just like this one. The key was the pre-programming; it allowed us to perform the security relearn procedure right in the bay and have him back on the road in under an hour. The stalling was gone, and his truck ran better than it had in years.
Is Your GM Vehicle Showing These Signs?
A faulty 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)
- ✔ Diagnostic Trouble Codes (DTCs) such as P0601, P0605, or U-series communication codes
- ✔ Engine stalling, stumbling, or hesitating
- ✔ Vehicle won’t start, but the battery and starter are good
- ✔ Poor or erratic automatic transmission shifting
- ✔ A noticeable drop in fuel economy
- ✔ Failure to pass an emissions test
A Straightforward Guide to Installation
This module is designed for a direct, hassle-free installation. For most DIYers with basic tools, this is a job you can handle in your own garage. After installation, a simple security relearn procedure may be required, which does not need a scan tool.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On most of these trucks and vans, the PCM is located in the engine compartment, typically on the driver’s side fender or near the battery.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old module. Inspect them for any corrosion or damage.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed PCM into place and securely reconnect the wiring harnesses.
- Reconnect the Battery: Reattach the negative battery terminal.
- Perform Security Relearn (if needed): Turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds. Repeat this cycle 3 times. On the fourth try, the vehicle should start, completing the relearn process.
Guaranteed Fitment for Your Vehicle
This Programmed PCM 16263494 is a direct replacement for part numbers 16263494, 16265035, 8162634940, 218-11787, and 21811787. Please verify your vehicle from the list below to ensure compatibility. Remember to provide your VIN upon purchase so we can program the module specifically for your truck or van.
CHEVROLET 2500 PICKUP 00 Electronic Control Module; gasoline (LH front engine compartment)
EXPRESS 1500 VAN 00 Electronic Control Module; (LH rear engine compartment)
EXPRESS 2500 VAN 00 Electronic Control Module; (LH rear engine compartment), gasoline
EXPRESS 3500 VAN 00 Electronic Control Module; (LH rear engine compartment), gasoline
SAVANA 1500 VAN 01-02 Electronic Control Module; (LH rear engine compartment), ID 16263494
ASTRO 00-01 Electronic Control Module; (LH front by battery), ID 16263494
GMC 3500 PICKUP 00 Electronic Control Module; gasoline (LH front engine compartment)
EXPRESS 2500 VAN 01-02 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
S10/S15/SONOMA 99-00 Electronic Control Module; (RH front engine compartment), 4.3L
SAVANA 1500 VAN 00 Electronic Control Module; (LH rear engine compartment)
ASTRO 99 Electronic Control Module; (LH front by battery), (4.3L), ID 16263494
ISUZU HOMBRE 99-00 Electronic Control Module; (RH front engine compartment), 4.3L (6 cylinder)
SAFARI (GMC) 99-01 Electronic Control Module; (LH front by battery), ID 16263494
SAVANA 3500 VAN 01-02 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
EXPRESS 1500 VAN 99 Electronic Control Module; (LH rear engine compartment), ID 16263494
GMC 1500 PICKUP 99 Electronic Control Module; 5.0L, (LH engine compartment), ID 16263494
BLAZER S10/JIMMY S15 98 Electronic Control Module; (RH front engine compartment), w/build date opt ZN4
GMC 1500 PICKUP 99 Electronic Control Module; 5.7L, (LH engine compartment), ID 16263494
SAVANA 3500 VAN 99 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
SAVANA 3500 VAN 00 Electronic Control Module; (LH rear engine compartment), gasoline
TAHOE 00 Electronic Control Module; Classic style (LH front engine compartment)
YUKON 99 Electronic Control Module; (LH engine compartment), ID 16263494
ESCALADE 99 Electronic Control Module; (LH front engine compartment), ID 16263494
ESCALADE 00 Electronic Control Module; (LH front under battery)
EXPRESS 2500 VAN 99 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
S10/S15/SONOMA 98 Electronic Control Module; 6-262 (4.3L), w/build date opt ZN4
YUKON 00 Electronic Control Module; (LH front under battery), Denali
BRAVADA 98 Electronic Control Module; (6-262, 4.3L), w/build date opt ZN4
CHEVROLET 3500 PICKUP 00 Electronic Control Module; gasoline (LH front engine compartment)
ENVOY 99-00 Electronic Control Module; (RH front engine compartment)
EXPRESS 1500 VAN 01-02 Electronic Control Module; (LH rear engine compartment), ID 16263494
EXPRESS 3500 VAN 99 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
GMC 3500 PICKUP 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
ISUZU HOMBRE 98 Electronic Control Module; 4.3L (6 cylinder), w/extended build date opt ZN4
SIERRA 1500 PICKUP 99-00 Electronic Control Module; (LH front under battery), 6 cylinder
SAVANA 2500 VAN 00 Electronic Control Module; (LH rear engine compartment), gasoline
SUBURBAN 1500 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
CHEVROLET 1500 PICKUP 99 Electronic Control Module; 5.7L, (LH engine compartment), ID 16263494
EXPRESS 3500 VAN 01-02 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
GMC 2500 PICKUP 00 Electronic Control Module; gasoline (LH front engine compartment)
SILVERADO 1500 PICKUP 99-00 Electronic Control Module; (LH front under battery), 6 cylinder
SUBURBAN 2500 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
BLAZER S10/JIMMY S15 99-00 Electronic Control Module; (RH front engine compartment)
CHEVROLET 3500 PICKUP 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
SAVANA 1500 VAN 99 Electronic Control Module; (LH rear engine compartment), ID 16263494
TAHOE 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
BRAVADA 99-00 Electronic Control Module; (RH front engine compartment)
CHEVROLET 1500 PICKUP 99 Electronic Control Module; 5.0L, (LH engine compartment), ID 16263494
SAVANA 2500 VAN 99 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
SAVANA 2500 VAN 01-02 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
ENVOY 98 Electronic Control Module; (RH front engine compartment), w/build date opt ZN4
GMC 2500 PICKUP 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
Frequently Asked Questions
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to load the exact GM-specified software for your vehicle’s engine, transmission, and options. This ensures perfect compatibility and performance, just like a module from the factory.
Is this part difficult to install?
Not at all for someone with basic mechanical skills. It’s a direct swap of the old module. The only extra step is a simple key-cycle security relearn procedure that you can do at home without any special tools.
What is the difference between a PCM and an ECM?
The terms are often used interchangeably. PCM (Powertrain Control Module) is more accurate for these vehicles as it controls both the engine and the transmission functions. ECM (Engine Control Module) typically just controls the engine.
Will this fix my check engine light?
If the check engine light is on due to an internal fault in the PCM (like code P0601), then yes, this will resolve the issue. However, you should always diagnose the codes to ensure the problem isn’t a bad sensor or other component.
Is there a core charge?
This listing does not require a core return, saving you the time and hassle of shipping your old, faulty part back to us.