Restore Your Van’s Reliability and Performance
Is your 1999-2002 Chevy Express 3500 van giving you headaches? If you’re dealing with frustrating issues like stalling, a no-start condition, erratic shifting, or a persistent check engine light, the problem often points directly to a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM controls everything from fuel mixture and ignition timing to transmission shift points. When it fails, your workhorse van can quickly become unreliable, costing you time and money.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the guesswork out of the repair by programming this module with the latest GM software updates, specifically matched to your van’s Vehicle Identification Number (VIN). This ensures seamless communication with your vehicle’s other systems and restores factory performance. Forget expensive dealership programming fees and long wait times. This is the direct, effective fix you need to get your van back on the road and working as hard as you do.
Case Study: The Intermittent Stall
I had a 2001 Express 3500 from a local plumbing company come into my bay. The driver’s complaint was maddening: the van would run perfectly for days, then suddenly stall at a stoplight and refuse to restart for 20 minutes. No consistent codes were stored, just a few random communication errors. We checked all the usual suspectsâfuel pressure, crank sensor, ignition systemâand everything tested fine. After hours of diagnostics, I noticed the PCM’s connectors showed slight signs of corrosion. On a hunch, we swapped in a known-good programmed module. The problem vanished instantly. The original PCM had an internal intermittent failure on the circuit board, likely from years of heat and vibration. This is a classic failure mode for these hard-working vans, and a pre-programmed module is the fastest, most reliable fix.
Is Your Van Showing These PCM Failure Signs?
A failing 1999-2002 Express 3500 Powertrain Module can cause a wide range of symptoms. If you’re experiencing any of the following, it’s a strong indicator that your PCM needs replacement:
- â Check Engine Light is on with codes like P0601 (Internal Memory Error) or P0606 (PCM Processor Fault).
- â The engine cranks but refuses to start.
- â Unexplained stalling or rough idling, especially when warm.
- â Noticeable decrease in fuel economy.
- â Harsh or erratic automatic transmission shifting.
- â Failure to pass an emissions or smog test.
- â Communication errors with your scan tool.
Your Step-by-Step PCM Installation Guide
Replacing the PCM on your Express Van is a straightforward job you can do with basic hand tools. Our pre-programmed module makes it even simpler. Follow these steps carefully for a successful installation.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On most Express and Savana vans, the PCM is located in the engine compartment on the driver’s side, near the rear. It’s a silver metal box with several large electrical connectors.
- Disconnect the Connectors: Carefully unlatch and remove all electrical harness connectors from the old PCM. Be gentle, as these plastic clips can become brittle over time.
- Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and secure the bolts.
- Reconnect Everything: Firmly plug all electrical connectors into the new module until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn (If Necessary): In many cases, you will need to perform a simple key-cycle security relearn procedure. Turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds. Repeat this process 3 times. On the final cycle, the vehicle should start, and the security light will turn off.
Verified Compatibility for Your GM Vehicle
This module is a direct replacement for part numbers 16263494, 16265035, 8162634940, and 218-11787. While this is the correct 1999-2002 Express 3500 Powertrain Module, it also fits a wide variety of other GM trucks and vans from that era. Please verify your vehicle is on the list below and that your original part number matches. Providing your VIN at checkout is required to ensure we send you a perfectly matched and programmed unit.
Chevy Express & GMC Savana Vans (1500, 2500, 3500) | Chevy Silverado & GMC Sierra Pickups | Chevy Tahoe, Suburban & GMC Yukon | Cadillac Escalade | Chevy S10, Blazer & GMC S15, Jimmy | Chevy Astro & GMC Safari | Oldsmobile Bravada, Envoy | Isuzu Hombre (1998-2002 models, check specific options)
Frequently Asked Questions
Do I need to do anything after I install it?
Our module comes programmed to your VIN. In most cases, the only additional step is a simple security relearn procedure, which involves cycling the key. We include instructions for this easy, no-tools-required process.
Why do you need my VIN?
Your vehicle’s VIN is essential. It allows us to load the exact GM-specified software for your van’s engine, transmission, and options. This guarantees compatibility and proper function, eliminating the need for a trip to the dealer.
Is this a guaranteed fix for my problem?
This module will resolve issues directly caused by a faulty PCM. While the symptoms listed are common for PCM failure, it’s always best practice to have a qualified mechanic diagnose the issue to rule out other problems like bad sensors or wiring.
Where is the part number on my old module?
The part number is typically printed on a sticker on the outside of your original PCM. Look for a number that matches one of the compatible part numbers listed, such as 16263494.
What if I have questions during installation?
We’re here to help. Our team of experienced technicians can provide support and guidance to ensure your installation is a success. Customer support information is included with your order.