Restore Peak Performance to Your GM Truck or SUV
Is your 1998 Chevrolet Blazer, GMC Jimmy, or other GM vehicle suffering from frustrating issues like a persistent Check Engine Light, rough idling, stalling, or poor fuel economy? Before you spend a fortune at the dealership, consider the root cause: a failing Powertrain Control Module (PCM). As the brain of your vehicle’s engine and transmission, a faulty PCM can create a cascade of problems that are often misdiagnosed. This fully programmed, OEM replacement PCM, part number 9355699, is the reliable and affordable solution to get your truck back on the road and running like it should.
We take the guesswork and hassle out of the repair. Unlike a generic module from a parts store, this unit is meticulously programmed to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This means we load the latest, most stable software updates from General Motors, often correcting factory bugs the original module may have had. It arrives at your door ready for a straightforward, plug-and-play installation.
From the Diagnostic Bay: The Intermittent No-Start Nightmare
I remember a 1998 GMC Jimmy S15 that came into my shop a few years back. The owner was at his wit’s end. The truck would run perfectly for days, then suddenly refuse to start. Other times, it would stall at a stoplight and then fire right back up. He had already replaced the fuel pump and ignition coil with no luck. The only code stored was an intermittent P0601 (Internal Control Module Memory Check Sum Error). After verifying all power and ground circuits to the PCM were solid, we knew where the problem was. The internal processor of the original PCM was failing. We swapped in a VIN-programmed module just like this one, performed the quick security relearn, and the problem was solved instantly. The customer called a month later to say his Jimmy had never run better. That’s the difference a reliable PCM makes.
Is Your GM Vehicle Showing These Signs of PCM Failure?
- ✔ Check Engine Light is on with codes like P0601, P0605, or other communication errors.
- ✔ The engine cranks but refuses to start (no-start condition).
- ✔ Unexplained stalling, especially when coming to a stop or at idle.
- ✔ Rough or erratic engine idling and hesitation during acceleration.
- ✔ Noticeable decrease in fuel mileage.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Communication issues with your diagnostic scan tool.
A Straightforward Guide to Installation
Replacing your 1998 Blazer Jimmy PCM is a job most DIYers can handle in under an hour with basic hand tools. This module is designed for a direct fit, making the process simple.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On most S10/S15 platform vehicles like the Blazer and Jimmy, the PCM is located in the engine compartment, typically on the passenger side firewall or inner fender. On vans and full-size trucks, it’s often on the driver’s side.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old PCM. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Bolt your new, pre-programmed PCM into place. Reconnect the wiring harnesses, ensuring they click securely into position.
- Reconnect the Battery: Reattach the negative battery terminal.
- Perform Security Relearn: You will likely need to perform a simple security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then OFF, and repeating two more times. This allows the new PCM to sync with your vehicle’s anti-theft system. Consult your owner’s manual for the exact procedure.
Verified Compatibility for a Wide Range of GM Vehicles
This PCM (part ID 9355699) is a direct replacement for multiple part numbers, including 16266645, 16250279, 16258815, and 09366810. It fits a vast array of GM models. Please verify your part number and vehicle from the list below to ensure compatibility.
Fits Models Including:
- Chevrolet: Astro Van, Blazer S10, C/K 1500/2500/3500 Pickup, Express 1500/2500/3500 Van, S10 Pickup, Suburban, Tahoe
- GMC: C/K 1500/2500/3500 Pickup, Envoy, Jimmy S15, Safari Van, Savana 1500/2500/3500 Van, Sonoma, Yukon
- Oldsmobile: Bravada
- Cadillac: Escalade
- Isuzu: Hombre
Note: This is a partial list. Please refer to the detailed fitment data and match your vehicle’s original PCM ID number (9355699) for guaranteed compatibility.
Frequently Asked Questions
How do I provide my VIN for programming?
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your vehicle’s 17-digit VIN. We cannot ship the module until we have this information, as the programming is essential for the part to function in your vehicle.
Is this a new part?
No, this is a high-quality, used OEM computer sourced from a salvaged vehicle. Each unit is thoroughly inspected and tested to ensure it is fully functional before being programmed with the latest GM software and shipped to you.
Do I need any special tools for installation?
No special tools are required. Basic hand tools, like a socket set, are all that’s needed to physically swap the module. The programming is already done for you.
What is the security relearn procedure?
The security relearn (also known as the Passlock relearn) syncs the new PCM with your vehicle’s anti-theft system. It’s a simple key-cycle procedure that you can do yourself in about 30 minutes and does not require a scan tool. We can provide instructions if needed.
Will this 1998 Blazer Jimmy PCM fix my transmission problems?
In many cases, yes. The PCM controls engine performance and automatic transmission shift points. If your PCM is failing, it can cause erratic shifting, delayed engagement, or slipping. Replacing a faulty PCM can often resolve these electronic-related transmission issues.