Is Your Blazer or Jimmy S15 Acting Up?
If you’re dealing with a 2001 or 2002 Chevy Blazer, S10, GMC Jimmy, or Sonoma that’s suddenly developed a mind of its own, the Powertrain Control Module (PCM) is a very likely culprit. As a mechanic with over two decades of experience, I’ve seen these exact vehicles roll into my bay with a frustrating list of symptoms. The owner is usually at their wit’s end, having already replaced sensors and other parts with no success.
A Real-World Story from the Shop
“A customer’s 2002 GMC Jimmy S15 came in last week with these exact symptoms. It would start fine cold, but after 20 minutes of driving, it would stall at stoplights and refuse to restart for an hour. The check engine light was on, and my scan tool pulled a P0601 code – ‘Internal Control Module Memory Check Sum Error.’ This code is a dead giveaway. The internal memory of the factory PCM had failed due to years of heat and vibration in the engine bay. We installed one of our VIN-programmed PCMs, and the Jimmy was running perfectly within 30 minutes. The customer was thrilled to have his reliable truck back without a costly trip to the dealership.”
Common Symptoms of a Failing GM PCM
The PCM is the brain of your vehicle’s engine and transmission. When it starts to fail, the symptoms can be erratic and confusing. Here’s what I see most often in the shop:
- ✔ Check Engine Light is on with communication-related codes (like U-codes) or internal processor fault codes (like P0601, P0604, P0606).
- ✔ The engine cranks but refuses to start, even with good fuel pressure and spark.
- ✔ Unexplained stalling, especially after the engine has warmed up.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A noticeable drop in fuel economy.
- ✔ The anti-theft or security light stays on, preventing the engine from starting.
The Direct Solution: A VIN-Programmed PCM
Don’t waste time and money chasing down phantom issues. This Powertrain Control Module is the definitive solution for a faulty computer in your 2001-2002 Blazer, Jimmy, S10, or other compatible GM vehicle. We take all the guesswork out of the repair.
Here’s how our process works for you:
- ✔ VIN-Specific Programming: You provide your Vehicle Identification Number (VIN) during checkout. We use that VIN to flash the module with the latest, most stable software updates directly from GM. This ensures it’s a perfect match for your vehicle’s specific configuration (engine, transmission, and options).
- ✔ No Dealer Required: Because the module arrives pre-programmed, you skip the expensive trip to the dealership for flashing. This is a true plug-and-play solution for most vehicles.
- ✔ Security Relearn Procedure: After installation, you will need to perform a simple security relearn procedure (often called the Passlock or VATS relearn). This takes about 30 minutes and involves turning the key on and off in a specific sequence. It’s a simple process that anyone can do, and it syncs the new PCM to your vehicle’s anti-theft system.
Installation Location
On the 2001-2002 Blazer, Jimmy, S10, and Sonoma, you’ll find the PCM located in the engine compartment on the front passenger side (RH side), typically mounted to the core support or inner fender. It’s held in by a few bolts and has large multi-pin connectors. Disconnect the negative battery terminal before you begin, and the swap is straightforward.
Guaranteed Compatibility
This module is a direct replacement for several service numbers. If your original module has one of the following numbers printed on the label, this is the correct part for you:
- ✔ 12200411
- ✔ 12201281
- ✔ 12576160
- ✔ 52369718
By ordering this module, you are getting a reliable, fully tested, and correctly programmed computer that will restore your vehicle’s performance and reliability. Get your truck back on the road and running right.