Restore Your Van’s Reliability and Performance
As a technician with over two decades of experience, I’ve seen firsthand how a failing Powertrain Control Module (PCM) can turn a dependable workhorse like a Savana van into a source of constant frustration. Mysterious stalling, a persistent Check Engine Light, or a sudden no-start can bring your work or travels to a grinding halt. This isn’t just an inconvenience; it’s a critical failure. The PCM is the brain of your vehicle’s engine and transmission, and when it falters, nothing works right. That’s why we offer this reliable, tested, and VIN-programmed 1998-1999 Savana 2500 PCM as a direct, effective solution.
We take the guesswork and high cost out of the equation. Forget paying for expensive diagnostic time and then a separate, costly programming fee at the dealership. We handle the programming for you before we ship. Simply provide your vehicle’s VIN at checkout, and we’ll flash this module with the latest GM software updates specific to your van. This ensures seamless communication between all your vehicle’s systems, restoring the smooth operation and fuel efficiency you depend on.
From the Diagnostic Bay: The Misleading Misfire
A customer brought in a ’99 Chevy Express van with a complaint of a random misfire and harsh shifting, especially when the engine was hot. He had already replaced plugs, wires, and the ignition coil based on advice from a forum, but the problem persisted. His scanner showed a P0300 (Random/Multiple Misfire Detected) but nothing else. In my shop, I’ve learned that when the basics don’t fix a random misfire on these older GM trucks, the PCM is a prime suspect. The internal drivers that fire the ignition coil can weaken over time, especially with heat exposure. We connected our diagnostic equipment and saw the command signal from the PCM was erratic. After installing a VIN-programmed PCM like this one, the misfire was gone, and the transmission shifted perfectly. It saved the customer from chasing phantom issues and replacing more unnecessary parts.
Is Your GM Truck or Van Showing These Signs?
- ✔ Check Engine Light is on with codes like P0601, P0602, or P0605 (Internal Control Module Errors).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling, rough idling, or hesitation during acceleration.
- ✔ Noticeably poor fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass an emissions/smog test.
Your Straightforward PCM Installation Guide
Replacing the 1998-1999 Savana 2500 PCM is a manageable job for a DIYer with basic tools. 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 Savana/Express vans, the PCM is located in the engine compartment on the driver’s side, near the battery or firewall. It’s a silver metal box with multiple large electrical connectors.
- Disconnect the Connectors: Carefully unlatch and remove all electrical harness connectors from the old PCM. These connectors have locking tabs that need to be released. Do not force them.
- 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 the electrical connectors into the new PCM, ensuring they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn: Your vehicle is equipped with a Passlock security system that needs to be synchronized with the new PCM. A simple relearn procedure is required, which typically involves turning the key to ‘ON’ for 10-15 minutes, then ‘OFF’, and repeating two more times before starting the engine. We include detailed instructions for this process.
Verified Fitment For These GM Models
This module, identified by service number 9366810 or interchange ID 9355699, is a guaranteed fit for a wide range of GM trucks and vans. Please match your part number to ensure compatibility. This is a partial list of compatible vehicles:
GMC: 1500/2500/3500 Pickups (98-99), Savana 1500/2500/3500 Vans (98-99), Yukon (98-99), Safari (98), Jimmy S15 (98), Sonoma (98)
Cadillac: Escalade (99)
Oldsmobile: Bravada (98)
Isuzu: Hombre (98)
Note: Specific engine and option codes may apply. Verifying your original part number is the best way to ensure a perfect match.
By choosing this quality used and programmed 1998-1999 Savana 2500 PCM, you’re not just buying a part; you’re getting a complete, ready-to-install solution that brings your trusted vehicle back to life.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential. It allows us to load the exact, correct GM software for your van’s specific engine, transmission, and options. This step is critical for ensuring your vehicle runs properly and avoids compatibility issues.
Is this part difficult to install?
No, the physical installation is straightforward for anyone comfortable with basic hand tools. The most important step after installation is the security relearn procedure, which we provide clear instructions for. It requires no special tools, just a little time.
What is the security relearn procedure?
It’s a simple process that synchronizes your vehicle’s anti-theft system (GM Passlock) with the replacement PCM. It typically involves a sequence of key turns and waiting periods. After this is complete, your vehicle will recognize the new ‘brain’ and start normally.
Since this part is used, how can I be sure it’s reliable?
Each module is sourced from a salvaged vehicle and visually inspected. The critical step is our professional programming and flashing service, which also serves as a comprehensive bench test. We ensure it communicates and accepts the latest software before it ever ships to you.
Will I need to do anything else after installation?
After completing the security relearn, we recommend clearing any old trouble codes with a standard OBD-II scanner. In some cases, a Crankshaft Position Sensor Variation Relearn (CASE Relearn) may be needed with a capable scan tool to resolve a P1336 code, but this is often not required for the vehicle to run well.