Restore Peak Performance to Your GM Truck or Van
Is your trusty 1999-2000 GMC 2500 Pickup suddenly giving you headaches? Unexplained stalling, a persistent Check Engine Light, rough idling, or a frustrating no-start condition can often be traced back to one critical component: the Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM manages everything from fuel injection and ignition timing to transmission shifting. When it fails, the symptoms can be unpredictable and difficult to diagnose. This replacement PCM is the definitive solution, arriving pre-programmed with the latest GM software specifically for your vehicle’s VIN.
From the Diagnostic Bay: The Ghost in the Machine
I remember a 2000 Chevy Silverado 2500 that came into my shop with a maddeningly intermittent issue. It would run perfectly for days, then suddenly refuse to start or stall at a stoplight. The owner had already replaced the battery, alternator, and fuel pump to no avail. After hooking up my scanner, I noticed intermittent communication loss with the PCM. On these specific GM trucks, I’ve seen the internal circuit boards develop microscopic cracks from years of heat cycles and vibration. The result is a ‘ghost’ that causes chaos. Swapping in a properly programmed PCM, like this one, resolved all issues instantly. It’s not just about replacing a part; it’s about providing a stable, reliable foundation for the entire powertrain.
Is Your GM Truck or Van Showing These Symptoms?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, your engine computer is a likely culprit. This is especially true if you see diagnostic trouble codes (DTCs) like P0601, P0604, or P0606, which point directly to an internal module fault.
- ✔ Unexplained Check Engine Light illumination
- ✔ Vehicle refuses to start or starts intermittently
- ✔ Poor or erratic automatic transmission shifting
- ✔ A noticeable drop in fuel economy
- ✔ Engine stalling, stumbling, or rough idling
- ✔ Failure to pass an emissions test
- ✔ Communication errors with a diagnostic scan tool
A Straightforward Guide to Your PCM Swap
One of the biggest benefits of this module is that it arrives ready to install, saving you a costly trip to the dealership for programming. The installation is simple enough for a confident DIYer. Here’s a general guide:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Module: On most compatible trucks (like the GMC 2500), the PCM is located in the engine compartment on the driver’s side, near the fender or firewall. On vans, it’s often in the LH rear of the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors. These often have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
- Install the New PCM: Mount the new module securely in the bracket and firmly reconnect the wiring harnesses. Ensure they click into place to establish a solid connection.
- Reconnect and Verify: Reconnect the negative battery terminal. Your vehicle may require a security relearn procedure, which typically involves cycling the key a few times. Consult your owner’s manual for specifics. Start the engine and check for proper operation.
Verified Vehicle Compatibility
This module is a direct replacement for part number 16263494 and is also compatible with service numbers 16265035, 8162634940, 218-11787, and 21811787. It is guaranteed to fit the following vehicles. Please match your vehicle and options carefully.
CHEVROLET 2500 PICKUP 00 Electronic Control Module; gasoline (LH front engine compartment)
EXPRESS 1500 VAN 00-02 Electronic Control Module; (LH rear engine compartment), ID 16263494
EXPRESS 2500 VAN 00-02 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
EXPRESS 3500 VAN 00-02 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
SAVANA 1500 VAN 00-02 Electronic Control Module; (LH rear engine compartment), ID 16263494
ASTRO 99-01 Electronic Control Module; (LH front by battery), ID 16263494
GMC 3500 PICKUP 00 Electronic Control Module; gasoline (LH front engine compartment)
S10/S15/SONOMA 99-00 Electronic Control Module; (RH front engine compartment), 4.3L
ISUZU HOMBRE 99-00 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, ID 16263494
EXPRESS 1500 VAN 99 Electronic Control Module; (LH rear engine compartment), ID 16263494
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)
SAVANA 3500 VAN 99 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
TAHOE 00 Electronic Control Module; Classic style (LH front engine compartment)
YUKON 99 Electronic Control Module; (LH engine compartment), ID 16263494
ESCALADE 99-00 Electronic Control Module; (LH front)
EXPRESS 2500 VAN 99 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
S10/S15/SONOMA 98 Electronic Control Module; 4.3L, w/build date opt ZN4
YUKON 00 Electronic Control Module; (LH front under battery), Denali
BRAVADA 98-00 Electronic Control Module; (RH front engine compartment)
CHEVROLET 3500 PICKUP 00 Electronic Control Module; gasoline (LH front engine compartment)
ENVOY 98-00 Electronic Control Module; (RH front engine compartment)
GMC 3500 PICKUP 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
ISUZU HOMBRE 98 Electronic Control Module; 4.3L, w/extended build date opt ZN4
SIERRA/SILVERADO 1500 PICKUP 99-00 Electronic Control Module; (LH front under battery), 6 cylinder
SAVANA 2500 VAN 00-02 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
SUBURBAN 1500/2500 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
CHEVROLET 1500 PICKUP 99 Electronic Control Module; 5.0L or 5.7L, (LH engine compartment), ID 16263494
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
SAVANA 2500 VAN 99 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
GMC 2500 PICKUP 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494