Restore Your Van’s Performance and Reliability
Is your 1998 or 1999 GMC Safari giving you headaches? If you’re dealing with frustrating issues like stalling, a persistent check engine light, rough idling, or even a no-start condition, a failing Powertrain Control Module (PCM) is often the culprit. This isn’t just an inconvenience; it affects your vehicle’s fuel economy, emissions, and overall drivability. This replacement PCM is the reliable, straightforward solution to get your dependable van back on the road, running as it should.
We take the guesswork and hassle out of the repair. Unlike a generic module from a parts store, this unit arrives at your door pre-programmed with the latest official GM software updates, specifically matched to your vehicle’s VIN. This means you can skip the expensive trip to the dealership for programming. It’s a direct-fit, ready-to-install solution designed for both professional technicians and dedicated DIYers.
From the Diagnostic Bay
I remember a ’99 Safari that came into my shop a few years back. The owner was at his wit’s end. It had an intermittent no-start condition that no one could pin down. It would run fine for a week, then refuse to start for an hour. We checked fuel pressure, spark, and all the usual suspects, which tested fine. After connecting a scope, we found the PCM was intermittently failing to command the fuel pump relay. It was a classic case of internal circuit board failure from years of heat and vibration. Swapping in a properly programmed PCM didn’t just fix the no-start; the owner called back a week later to say the transmission was shifting smoother than it had in years. That’s the power of having the vehicle’s ‘brain’ working correctly.
Is Your GMC Safari Showing These Signs?
- âś” Check Engine Light is on with codes like P0601, P0602, P0606, or other communication errors.
- âś” The engine cranks but refuses to start.
- âś” Unexplained stalling or rough, erratic idling.
- âś” Noticeable decrease in fuel mileage.
- âś” Harsh or incorrect automatic transmission shifting.
- âś” Failure to pass an emissions or smog test.
A Straightforward Guide to Installation
- âś” Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting work on any electronic components.
- âś” Locate the PCM: On the 1998-1999 GMC Safari, the PCM is located in the engine compartment on the driver’s side, right next to the battery.
- âś” Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
- âś” Install the New Module: Mount the new PCM onto the bracket and securely plug in the wiring harnesses. Ensure they click into place.
- âś” Reconnect the Battery: Reattach the negative battery terminal and tighten it securely.
- âś” Security Relearn (If Necessary): In most cases, you will need to perform a security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. This allows the vehicle’s anti-theft system to recognize the new PCM.
Guaranteed Fitment for Your GM Vehicle
This module, identified by part numbers 09366810, 16250279, or 09355699, is the correct replacement for a wide range of GM trucks and vans. Please verify your vehicle is on this list:
BLAZER S10/JIMMY S15 98 (RH front engine compartment), w/o build date opt ZN4; ID 16250279 or 16258815
BRAVADA 98 (6-262, 4.3L), w/o build date opt ZN4; ID 16250279 or 16258815
CHEVROLET 1500 PICKUP 98-99 (Gasoline, LH engine compartment), ID 16250279
CHEVROLET 2500 PICKUP 98-99 (Gasoline, LH front engine compartment), ID 16250279
CHEVROLET 3500 PICKUP 98-99 (Gasoline, LH front engine compartment), ID 16250279
ENVOY 98 (RH front engine compartment), w/o build date opt ZN4; ID 16250279 or 16258815
ESCALADE 99 (LH front engine compartment), ID 16250279
EXPRESS 1500/2500/3500 VAN 98 (Gasoline), ID 16250279
GMC 1500 PICKUP 98-99 (Gasoline, LH engine compartment), ID 16250279
GMC 2500 PICKUP 98-99 (Gasoline, LH front engine compartment), ID 16250279
GMC 3500 PICKUP 98-99 (Gasoline, LH front engine compartment), ID 16250279
ISUZU HOMBRE 98 (4.3L), w/o extended build date opt ZN4; ID 16258815
S10/S15/SONOMA 98 (4.3L), w/o build date opt ZN4; ID 16250279 or 16258815
SAFARI (GMC) 98-99 (LH front by battery), ID 16250279
SAVANA 1500/2500/3500 VAN 98 (Gasoline), ID 16250279
SUBURBAN 1500/2500 98-99 (Gasoline, LH front engine compartment), ID 16250279
TAHOE 98-99 (Gasoline, LH engine compartment), ID 16250279
YUKON 98-99 (LH engine compartment), ID 16250279
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential for us to program the module with the exact software and calibrations for your specific vehicle. This ensures perfect compatibility with your engine, transmission, and factory options.
Is this a simple plug-and-play installation?
Yes, because we program it before shipping, it is a plug-and-play part. In some cases, a simple ‘Security Relearn’ procedure, which you can do yourself in 15 minutes with just the ignition key, may be required. We include instructions for this.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM (common codes P0601-P0606), then yes, this will resolve the issue. However, you should always ensure other potential problems (like faulty sensors) have been ruled out.
How do I find my original part number?
The part number is printed on a sticker on the PCM itself. You can cross-reference it with the compatible numbers listed here (16250279, 09366810, 09355699) to confirm a match.