Restore Peak Performance to Your 1998 GMC Safari
Is your 1998 GMC Safari or compatible GM truck/van experiencing frustrating issues like a persistent check engine light, rough idling, stalling, or a complete no-start condition? These are classic symptoms of a failing Powertrain Control Module (PCM), the central computer that manages your vehicle’s engine and transmission functions. A faulty PCM can disrupt everything from fuel delivery and ignition timing to shift points, leading to poor performance, decreased fuel economy, and failed emissions tests. This replacement PCM, part number 16258815, is the reliable solution to get your vehicle back in top operational form.
From the Diagnostic Bay
We had a 1998 Chevy Express van come into the shop with a complaint of intermittent stalling and a P0300 (Random Misfire) code that just wouldn’t go away. The owner had already replaced the spark plugs, wires, cap, and rotor. We checked fuel pressure and for vacuum leaks—everything seemed fine. On a hunch, we monitored the PCM’s driver signals for the ignition coil and injectors. We found the injector driver for cylinder 3 was dropping out sporadically. Instead of chasing more parts, we swapped in a programmed PCM. The van fired right up, idled smoothly, and the misfire was gone. It’s a great reminder that when the basics check out, the problem often lies with the computer itself.
Your Solution: A Programmed 1998 GMC Safari PCM
Don’t settle for a generic, unprogrammed computer that will cause more headaches than it solves. This is a quality, tested PCM sourced from a salvaged vehicle, and its key benefit is our professional programming service. Before we ship it, our technicians will flash the module with the latest official GM software updates and calibrate it specifically to your vehicle using the VIN you provide. This critical step ensures seamless communication with your vehicle’s other modules, correct engine and transmission operation, and eliminates the need for expensive programming at a dealership. It’s a direct-fit, ready-to-install solution designed to restore the original performance and reliability of your vehicle.
Common Symptoms of a Failing Engine Computer
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Vehicle refuses to start or starts and immediately stalls.
- ✔ Rough or erratic engine idling.
- ✔ Noticeable decrease in fuel economy.
- ✔ Poor acceleration and overall engine performance.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Communication errors when using a diagnostic scan tool.
Simple Process, Professional Results
Our goal is to make this repair as straightforward as possible. After you complete your purchase, simply provide us with your vehicle’s 17-digit VIN. Our team will handle the complex programming, ensuring the PCM you receive is a perfect match for your vehicle’s specific configuration. While installation is a direct replacement, please note that a Crankshaft Variation Relearn (CASE relearn) procedure is often required after the new PCM is installed. This procedure can be performed by any qualified technician with a compatible bi-directional scan tool and is necessary to prevent misfire codes.
This PCM is a direct replacement for the following part numbers:
09355699, 16266645, 9355699, 16250279, 16258815, 09366810, 9366810. Please verify that your original module carries one of these numbers to ensure compatibility.
Guaranteed Fitment for a Wide Range of GM Vehicles:
This Electronic Control Module is confirmed to fit the following vehicles with service ID number 09355699. Please check your original part to confirm.
- 1998-1999 Chevrolet & GMC C/K 1500, 2500, 3500 Pickups (Gasoline)
- 1998-1999 Chevrolet Suburban 1500 & 2500 (Gasoline)
- 1998-1999 Chevrolet Tahoe & GMC Yukon (Gasoline)
- 1998-1999 Chevrolet Express & GMC Savana 1500, 2500, 3500 Vans (Gasoline)
- 1999 Cadillac Escalade
- 1998 Chevrolet Astro & GMC Safari
- 1998 Chevrolet S10 & GMC Sonoma (4.3L)
- 1998 Chevrolet Blazer & GMC Jimmy (4.3L)
- 1998 Oldsmobile Bravada (4.3L)
- 1998 GMC Envoy (4.3L)
- 1998 Isuzu Hombre (4.3L)
Frequently Asked Questions
Do I need to get this computer programmed?
No. We handle the programming for you before shipment. Simply provide your vehicle’s VIN during or after checkout, and it will arrive ready for installation.
What is a CASE relearn? Is it required?
A CASE (Crankshaft Angle Sensor Error) relearn is a procedure that synchronizes the new PCM with your engine’s crankshaft position sensor. It is highly recommended after installation to prevent a P1336 trouble code and ensure accurate misfire detection. A mechanic with a capable scan tool can perform this procedure.
Is this a new part?
No, this is a high-quality, fully tested, and functional used PCM recovered from a salvaged vehicle. Each unit is inspected to ensure it is ready for programming and long-term service.
How do I find my original part number?
Your original part number is printed on a sticker on the case of your existing PCM. For a 1998 GMC Safari, it is typically located in the engine compartment on the driver’s side, near the battery.
Will this fix my vehicle’s problem for sure?
This part will resolve any issues directly caused by a faulty PCM. However, it’s crucial to ensure your vehicle has been properly diagnosed. This part will not fix problems related to other faulty components like sensors, wiring, or fuel system parts.