Restore Peak Performance to Your GM Van or Truck
If you’re dealing with a frustrating no-start condition, a persistent check engine light, or erratic engine behavior in your 1999-2002 GM vehicle, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer for your engine and transmission, its health is critical. I’ve seen it in my shop hundreds of times: a perfectly good engine acting up because the PCM is sending faulty signals. This isn’t just a replacement part; it’s a direct solution to restore your vehicle’s reliability and drivability.
We make the process simple. This Express 1500 Van PCM arrives at your door pre-programmed with the latest official GM software updates, specifically matched to your vehicle’s VIN. This eliminates the need for an expensive trip to the dealership for programming. You get a reliable, plug-and-play solution that corrects common factory software bugs and ensures your engine and transmission are communicating perfectly.
From the Diagnostic Bay
I remember a 2001 Savana 2500 work van that came in on a tow truck. The owner was at his wit’s end. The van would run fine for days, then suddenly die at a stoplight and refuse to restart for an hour. Other shops had replaced the fuel pump and crank sensor, but the problem persisted. When I connected my scan tool, I found intermittent communication loss with the PCM and a stored history code P0601 (Internal Control Module Memory Check Sum Error). This is a classic sign of internal PCM failure. We installed one of our pre-programmed modules, performed the security relearn, and the van ran flawlessly. The customer called a month later to say his van had never been more reliable. That’s the difference a solid PCM makes.
Is Your GM Truck or Van Showing These Signs?
A failing PCM can cause a wide range of confusing symptoms. If you’re experiencing any of the following, this module is likely the solution you need:
- ✔ Check Engine Light is on with codes like P0601, P0606, or other communication errors.
- ✔ Engine stalls unexpectedly or refuses to start.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Noticeable decrease in fuel economy.
- ✔ The engine runs rough, misfires, or hesitates on acceleration.
- ✔ Failure to pass an emissions test.
- ✔ Your scan tool cannot communicate with the PCM.
A Straightforward Guide to Installation
Replacing the PCM is a job most DIYers can handle with basic tools. The key is knowing where to look and performing the security relearn procedure afterward.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On Express and Savana vans, it’s typically in the LH rear of the engine compartment. On Pickups, Tahoes, and Suburbans, it’s often on the LH side, sometimes under the battery tray. For S10/Blazer/Jimmy models, check the RH front of the engine compartment.
- 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. A small socket set is usually all that’s needed.
- Install the New Module: Bolt the new, pre-programmed PCM into place and securely reconnect the electrical harnesses. Ensure they click into place.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn (CRITICAL): This step is essential for the vehicle to start. Turn the key to the ‘ON’ position (don’t start) for 10-11 minutes, until the ‘Security’ light turns off. Turn the key ‘OFF’ for 10 seconds. Repeat this cycle two more times (for a total of 3 cycles / 30 minutes). The vehicle will then start and run normally.
Verified Vehicle Compatibility
This module is a direct fit for a wide range of GM trucks and vans. Please verify your vehicle is on this list. This part is compatible with service numbers: 16263494, 16265035, 8162634940, 218-11787, 21811787.
– ASTRO 99-01 (4.3L, ID 16263494)
– BLAZER S10 98-00 (4.3L)
– C1500/2500/3500 PICKUP 99-00 (Gasoline)
– EXPRESS 1500 VAN 99-02
– EXPRESS 2500 VAN 99-02 (Gasoline)
– EXPRESS 3500 VAN 99-02 (Gasoline)
– S10 PICKUP 98-00 (4.3L)
– SILVERADO 1500 PICKUP 99-00 (4.3L V6)
– SUBURBAN 1500/2500 99 (Gasoline, ID 16263494)
– TAHOE 99-00 (Gasoline)
GMC:
– C1500/2500/3500 PICKUP 99-00 (Gasoline)
– ENVOY 98-00
– JIMMY S15 98-00 (4.3L)
– SAFARI 99-01 (4.3L, ID 16263494)
– SAVANA 1500 VAN 99-02
– SAVANA 2500 VAN 99-02 (Gasoline)
– SAVANA 3500 VAN 99-02 (Gasoline)
– SIERRA 1500 PICKUP 99-00 (4.3L V6)
– SONOMA 98-00 (4.3L)
– YUKON 99-00
Cadillac:
– ESCALADE 99-00
Oldsmobile:
– BRAVADA 98-00 (4.3L)
Isuzu:
– HOMBRE 98-00 (4.3L)
Frequently Asked Questions
Do I need to program this module when I receive it?
No. We program the module to your vehicle’s specific VIN before shipping. It arrives ready for installation and the security relearn procedure.
Where do I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on a metal plate on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Is the security relearn procedure difficult?
Not at all. It requires no special tools, just your ignition key and about 30 minutes of time. Following the 3-cycle, 10-minute-on/10-second-off process is straightforward and will sync the module to your vehicle’s anti-theft system.
Will this fix my specific problem?
This module will correct any issues directly caused by a failing PCM. While it solves the most common electronic problems for these vehicles, it’s always best to ensure your vehicle has been properly diagnosed. This part resolves issues like internal circuit failure (P0601) and processor faults.
What if my original part number is slightly different?
This module replaces several part numbers, including 16263494 and 16265035. As long as your vehicle is on the compatibility list, providing us with your VIN ensures we load the correct software for a perfect match.