Restore Peak Performance to Your GM Workhorse
If you’re dealing with a frustrating no-start condition, erratic engine behavior, or a persistent Check Engine light in your 1999-2002 GMC Savana 2500 Van, a failing Powertrain Control Module (PCM) is often the culprit. As a technician with over two decades of experience, I’ve seen firsthand how a faulty PCM can cause headaches that seem impossible to diagnose. This isn’t just a part; it’s the central computer for your engine and transmission, and when it fails, your vehicle’s reliability is compromised. This replacement module is your direct, reliable solution to get your truck or van operating as it should.
We take the guesswork and high costs out of the equation. Each 1999-2002 Savana 2500 PCM is meticulously programmed with the latest official GM software updates, tailored specifically to your vehicle’s VIN. This means you skip the expensive trip to the dealership for programming. Simply provide us with your VIN upon purchase, and we’ll handle the complex part, shipping you a module that’s ready for installation.
Case Study: A Tricky Diagnosis
I remember a 2001 Express 2500 work van that came into my shop. The owner was at his wit’s end. The van would run fine when cold, but after about 30 minutes of city driving, it would intermittently stall at red lights and then struggle to restart. There were no consistent trouble codes, just a random P0300 (Random Misfire) every so often. We checked fuel pressure, ignition components, and sensors—all tested fine. On a hunch, I monitored live data on a long test drive. As the engine bay heated up, I saw the short-term fuel trim values start to fluctuate wildly just before a stall. The original PCM’s internal processor was failing under heat. We installed one of these pre-programmed modules, and the problem was solved instantly. It’s a classic failure mode for these hard-working vehicles.
Is Your GM Vehicle Showing These Signs of PCM Failure?
- ✔ Check Engine Light: Persistent illumination, often with codes like P0601 (Internal Control Module Memory Check Sum Error), P0606 (ECM/PCM Processor Fault), or various communication (U-prefix) codes.
- ✔ No-Start or Hard Starting: The engine cranks but refuses to start, or takes an excessively long time to fire up.
- ✔ Engine Stalling: The engine quits unexpectedly, especially after warming up or while idling.
- ✔ Poor Performance & Fuel Economy: A noticeable drop in power, acceleration, and miles per gallon.
- ✔ Erratic Transmission Shifting: Harsh shifts, delayed engagement, or getting stuck in one gear (limp mode).
- ✔ Failed Emissions Test: Inability to pass smog due to PCM-related faults.
A Mechanic’s Guide to PCM Installation
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes before beginning work.
- ✔ Locate the Module: On most Savana and Express vans, the PCM is located in the engine compartment on the driver’s side (LH), near the rear. On pickups and SUVs, it’s often on the driver’s side fender well or near the battery.
- ✔ Disconnect Connectors: Carefully unlatch and remove the electrical harness connectors from the old PCM. Inspect them for any corrosion or damage.
- ✔ Swap the Modules: Unbolt and remove the old module. Mount the new, pre-programmed PCM securely in its place.
- ✔ Reconnect Everything: Firmly plug the harness connectors into the new module until they click into place. Reconnect the negative battery terminal.
- ✔ Perform Relearn Procedures: While the module is programmed, most of these GM vehicles require a security relearn (Passlock/VATS) and a Crankshaft Position (CASE) relearn procedure to be completed with a capable scan tool for full functionality and to prevent certain trouble codes.
Verified Vehicle Compatibility
This module, identified by part number 16263494, is a direct replacement for a wide range of GM vehicles. It is also compatible with part numbers 16265035, 8162634940, 218-11787, and 21811787. Please verify your vehicle is on this list:
- ASTRO 99-01 (4.3L)
- BLAZER S10/JIMMY S15 98-00
- BRAVADA 98-00
- ESCALADE 99-00
- ENVOY 98-00
- EXPRESS/SAVANA 1500 VAN 99-02
- EXPRESS/SAVANA 2500 VAN 99-02 (Gasoline)
- EXPRESS/SAVANA 3500 VAN 99-02 (Gasoline)
- ISUZU HOMBRE 98-00 (4.3L)
- SAFARI (GMC) 99-01
- S10/S15/SONOMA 98-00 (4.3L)
- CHEVROLET/GMC 1500 PICKUP 99 (5.0L, 5.7L)
- CHEVROLET/GMC 2500 PICKUP 99-00 (Gasoline)
- CHEVROLET/GMC 3500 PICKUP 99-00 (Gasoline)
- SIERRA/SILVERADO 1500 PICKUP 99-00 (4.3L V6)
- SUBURBAN 1500/2500 99 (Gasoline)
- TAHOE/YUKON 99-00 (Incl. Denali & Classic)
Note: This is a comprehensive list. Always match your part number or consult the detailed fitment data if unsure. This specific 1999-2002 Savana 2500 PCM is a guaranteed fit for the models listed.
Frequently Asked Questions
How does the VIN programming work?
After you place your order, you will need to provide us with your vehicle’s 17-digit VIN. We use this to load the correct, factory-approved software and calibrations for your specific vehicle onto the module before we ship it.
Is any further programming needed after installation?
The module arrives with the core engine and transmission software. However, for these specific GM models, two additional procedures are typically required: a Security Relearn (for anti-theft) and a Crankshaft Position (CASE) Relearn. These procedures sync the new PCM to your vehicle’s systems and require a scan tool with these capabilities.
What is a CASE relearn and why is it important?
A CASE relearn synchronizes the PCM with the crankshaft position sensor’s signal. It is necessary to ensure the engine’s misfire detection system works correctly and to clear a potential P1336 trouble code after PCM replacement. Most professional repair shops can perform this service.
Where is the PCM on my 2002 Savana 2500 Van?
On the 1999-2002 Savana and Express vans, the PCM is typically located in the engine compartment on the driver’s side (LH), mounted near the firewall or inner fender.
What if I order the wrong part?
We strongly recommend verifying your original part number before ordering. Providing your VIN for programming allows us to double-check compatibility, significantly reducing the chance of an error. If you have any doubts, please contact us for assistance.