Restore Your Truck’s Performance with a Reliable, Programmed PCM
Is your 1998 Chevrolet Blazer or GMC Jimmy S15 giving you headaches? If you’re dealing with frustrating issues like stalling, a persistent check engine light, or a no-start condition that leaves you stranded, the problem often points directly to a failing Powertrain Control Module (PCM). As the brain of your vehicle, when the PCM starts to fail, it can cause a cascade of confusing and unpredictable problems. I’ve spent countless hours in the shop tracing wires and testing sensors, only to find the root cause was a faulty engine computer. This isn’t just a part; it’s the central command for your engine’s performance and reliability.
This isn’t a generic, off-the-shelf computer that leaves you guessing. We take a reliable, tested PCM (interchangeable with part numbers 09355699, 16266645, 16250279, 16258815, 09366810) and professionally program it with the latest GM software updates specifically for your vehicle’s VIN. This critical step ensures that your engine, transmission, and all related systems communicate perfectly, just as the factory intended. You get a cost-effective solution that eliminates the need for an expensive trip to the dealership for programming.
Case Study: The Intermittent No-Start
A customer brought in a ’98 Jimmy S15 with a maddening problem: it would start perfectly cold, but after a 20-minute drive, it wouldn’t restart until it cooled down for an hour. There were no consistent trouble codes, just a random loss of communication. After checking the usual suspects—fuel pressure, spark, and crank sensor—we focused on the PCM. On these older GM modules, internal capacitors and driver circuits can become sensitive to heat. When they fail, they can disrupt the processor, causing these exact intermittent no-start conditions. Swapping in a tested, correctly programmed 1998 Blazer Jimmy PCM solved the problem instantly. It’s a classic failure I’ve seen dozens of times on these 4.3L V6 platforms.
Is Your S10/Jimmy Showing These Signs of PCM Failure?
- ✔ Engine stalls for no apparent reason, especially when warm.
- ✔ Hard starting or complete no-start condition.
- ✔ Check Engine Light is on with internal module codes like P0601 or P0605.
- ✔ Poor fuel economy and noticeable loss of power.
- ✔ Erratic automatic transmission shifting or getting stuck in one gear.
- ✔ Scan tool cannot communicate with the engine computer (U-codes).
- ✔ Misfires or rough idle even after replacing plugs, wires, and coils.
DIY-Friendly Installation Guide
Replacing the 1998 Blazer Jimmy PCM is a straightforward job you can do with basic hand tools. Follow these steps to get your vehicle back on the road quickly.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- Locate the PCM: On the 1998 Blazer/Jimmy, the PCM is typically located in the engine compartment on the right-hand (passenger) side, often near the firewall or inner fender.
- Disconnect the Wiring: Carefully unplug the electrical connectors from the old PCM. These connectors have locking tabs that may need to be squeezed or lifted to release. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s usually held in place by a few small bolts or nuts.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely tighten the bolts.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new PCM until they click into place. Reconnect the negative battery terminal.
- Final Step: Your vehicle may require a security relearn procedure, which is simple and involves turning the key on and off in a specific sequence. We include instructions for this process with your order.
Verified Fitment for Your GM Truck or Van
This module is a direct replacement for service ID 9355699 and part number 16258815. It is guaranteed to fit and function in the following vehicles, provided the ID number on your original module matches. Please note this is a partial list based on the most common applications.
ASTRO 98 (4.3L)
BLAZER S10 98 (4.3L)
C/K 1500/2500/3500 PICKUP 98-99 (Gasoline)
EXPRESS 1500/2500/3500 VAN 98-99 (Gasoline)
SUBURBAN 1500/2500 98-99 (Gasoline)
S10 PICKUP 98 (4.3L)
TAHOE 98-99 (Gasoline)
GMC:
ENVOY 98 (4.3L)
JIMMY S15 98 (4.3L)
C/K 1500/2500/3500 PICKUP 98-99 (Gasoline)
SAFARI 98 (4.3L)
SAVANA 1500/2500/3500 VAN 98-99 (Gasoline)
SONOMA 98 (4.3L)
YUKON 98-99 (Gasoline)
Cadillac / Oldsmobile / Isuzu:
ESCALADE 99
BRAVADA 98 (4.3L)
ISUZU HOMBRE 98 (4.3L)
Frequently Asked Questions
What does ‘VIN Programmed’ mean?
It means we load your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM-certified software onto the computer before shipping. This ensures it works seamlessly with your truck’s engine, transmission, and options, avoiding a costly trip to the dealer.
Is this a used part?
Yes, this is a thoroughly tested and inspected computer sourced from a salvaged vehicle. This provides a reliable, factory-original part at a significant cost savings compared to a new unit, which is often no longer available for vehicles of this age.
Will I need to do anything after I install it?
After installation, you will need to perform a simple security relearn procedure (also known as a CASE relearn). This process syncs the new PCM with your vehicle’s anti-theft system. We provide easy-to-follow instructions for this procedure with your purchase. No special tools are required.
How do I know if the PCM is really the problem?
While the symptoms listed above are strong indicators, a definitive diagnosis is key. This is often done by a professional mechanic who has ruled out other potential causes like fuel delivery, ignition components, or sensor failures. If you see internal processor fault codes (like P0601), it’s a very strong sign the PCM itself has failed.
What information do you need from me?
After you place your order, you must provide us with your 17-digit VIN. You can typically find this on your vehicle’s dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.