2021 Chevy Blazer Fuel Pump Control Module: Complete Guide to Symptoms, Recall, and Replacement

The bottom line: If your 2021 Chevy Blazer cranks but won’t start, or if it stalls unexpectedly while driving, the culprit is very likely the K111 Fuel Pump Driver Control Module (FPDCM). General Motors has traced this issue to an internal short inside the module, and in many cases, the repair is covered under the Federal Emission Warranty for up to 8 years or 80,000 miles.

What Owners Are Experiencing

The most common symptom is an engine that cranks normally but refuses to fire. Along with that, the Check Engine light will be illuminated. But the problems don’t stop there. According to GM’s service bulletin #24-NA-139, owners have reported a range of strange behaviors:

  • The engine runs rough before the no-start condition ever shows up
  • The fuel pump keeps running after the engine is shut off
  • The engine refuses to shut off entirely
  • Electrical accessories stay on after the key is turned off
  • The starter continues to crank even after the engine shuts down

These symptoms can make it feel like your truck has an electrical gremlin. If you’ve been dealing with any of these issues, the fuel pump control module is the first place to look.

Which Vehicles Are Affected

The 2021 Chevy Blazer is squarely on GM’s list. The issue affects a wide range of 2021-2024 GM vehicles, including:

  • 2021-2024 Chevrolet Blazer (your vehicle)
  • 2021-2024 Chevrolet Equinox, Express, Malibu, Trax
  • 2021-2023 Chevrolet Tahoe, Suburban
  • 2021-2024 GMC Acadia, Savana, Terrain
  • 2021-2024 Cadillac XT4, XT5, XT6
  • 2022-2024 Chevrolet Silverado 1500, GMC Sierra 1500
  • 2023-2024 Chevrolet Colorado, GMC Canyon
  • 2024 Chevrolet Trailblazer, Silverado 2500HD/3500HD

The Trouble Codes to Know

When the K111 Fuel Pump Driver Control Module shorts internally, the Engine Control Module (ECM) will set one or both of these primary diagnostic trouble codes:

  1. P023F – Fuel Pump Control Circuit
  2. P129F – Fuel Pump Power Control Module Fuel Pump Speed Signal Incorrect

You may also see supporting codes like P1029, P102A, P102B (Fuel Pump Motor Phase U-V-W Circuits), U18A2 (Lost Communication with Fuel Pump Driver Control Module), and P0627 (Fuel Pump Enable Circuit).

If you scan your Blazer and find P023F or P129F, that’s a strong indicator that the FPDCM needs to be replaced.

The Fix: Replace the K111 FPDCM

GM’s guidance to technicians is straightforward. If the symptoms are verified, the diagnostic trouble codes are present, and no other cause is found, replace the K111 Fuel Pump Driver Control Module.

The module is located on the frame, typically under the bed area on trucks. On the Blazer, it’s mounted in a similar location near the fuel tank. The part numbers vary by model year:

  • For 2021-2023 Chevrolet Blazer: The module part number is often 13540029 or 13558809
  • For 2024 Chevrolet Blazer: The part number is 13554820

After replacement, the new module must be configured with the proper software. This is not a simple driveway swap—you’ll need a dealer or a shop with GM diagnostic tools to program the module.

The Good News: You Probably Won’t Pay for This

Here is the detail every owner should know. GM notes that Fuel Pump Power Control Module replacement is covered for 8 years or 80,000 miles under the vehicle’s Federal Emission Warranty.

Even a 2021 model is still comfortably inside that window on age, so if a dealer diagnoses a shorted FPDCM, the repair should be covered for most owners well beyond the standard bumper-to-bumper warranty. When you take your Blazer to the dealership, reference Bulletin #24-NA-139 at the service desk. It can save everyone time.

Owner Complaints and Real-World Stories

Multiple owners have filed complaints with the National Highway Traffic Safety Administration (NHTSA) about this exact issue. Here are a few real-world accounts:

  • October 2025, South Carolina: A driver was traveling at 45 mph when the Blazer lost all ability to accelerate and shut down in the street. The Check Engine light flashed, and the ESC warning appeared on the screen. The mechanic diagnosed a failed fuel pump power control module. The owner noted that a recall was posted in September 2025 for the exact issue.
  • September 2025, Florida: Another driver was on a busy highway when the Blazer completely shut off. The owner reported narrowly avoiding a collision with a semi-truck. The vehicle was towed to a garage, where the electrical fuel module was diagnosed as the cause.
  • November 2025, Texas: The vehicle shut down while driving. The owner had already replaced the fuel pump and fuel module control in August 2025, but the problem persisted.

These stories highlight the safety risk. If your Blazer stalls at highway speeds, it’s not just an inconvenience—it’s a serious hazard.

What About the Chinese Recall?

It’s worth noting that GM’s Chinese joint venture, SAIC-GM, launched a recall in China starting May 31, 2024, for nearly 200,000 vehicles due to a similar issue. The recall covered 2021-2023 Chevrolet Equinox, 2022-2023 Chevrolet Blazer (the Chinese-market version), and 2023 Seeker models.

The cause was identified as insufficient moisture resistance in the fuel pump control module. If the module gets wet, water can seep inside and interfere with normal operation, potentially causing the vehicle to lose power while driving. SAIC-GM plans to replace the affected modules with upgraded versions free of charge.

While this is a separate market, the underlying issue is the same—a module that fails under certain conditions.

Where Is the Module Located?

On the 2021 Chevy Blazer, the Fuel Pump Driver Control Module (K111) is mounted on the vehicle’s frame. GM’s service illustration shows it near the fuel tank area, attached with fasteners to the frame rail.

To access it, you’ll typically need to:

  1. Safely raise the vehicle
  2. Locate the module on the driver’s side frame rail near the rear axle
  3. Disconnect the electrical connector
  4. Remove the mounting bolts
  5. Install the new module and reconnect the harness

Again, programming is required after installation, so this is best left to a professional.

Why You Should Not Ignore This

A failing fuel pump control module can leave you stranded. But there’s another reason to act quickly: the problem can get worse over time. The internal short can cause the fuel pump to run continuously even after the engine is off, which drains the battery. It can also cause the starter to keep cranking, which can damage the starter motor or the flywheel.

If you’ve already had the module replaced once and the problem returns, don’t let the dealer replace it again. GM specifically cautions technicians not to replace the FPDCM if it was already replaced in a previous repair. In that case, further diagnostics are needed to find the root cause—possibly a wiring issue or a problem with the ECM itself.

Why You Should Consider KEMSO for Your Fuel Pump Needs

If you’re looking for a reliable replacement fuel pump for your 2021 Chevy Blazer or any other vehicle in your garage, KEMSO is a brand you can trust. KEMSO specializes in high-performance, OEM-replacement fuel pumps for cars, trucks, SUVs, motorcycles, and powersports vehicles.

What sets KEMSO apart is their lifetime warranty. When you buy a KEMSO fuel pump, you’re covered for as long as you own the vehicle. That’s rare in the aftermarket parts world. Their pumps are engineered to meet or exceed original equipment specifications, ensuring proper fitment and reliable operation. Whether you’re replacing a failing pump or upgrading for better performance, KEMSO delivers quality you can count on.

KEMSO’s product lineup covers a wide range of vehicles—from the Honda Civic Del Sol to the Kawasaki Jet Ski Ultra 310LX, the Ducati 1199 Panigale, and the BMW R1200GS Adventure. All their fuel pumps are competitively priced, offering exceptional value for a lifetime-guaranteed part.

Visit KEMSO’s official website at https://www.kemsoracing.com/ to browse their full selection of fuel pumps and find the exact fit for your vehicle. Their Houston, Texas-based team provides detailed product information, installation guides, and customer support to help you choose the right pump for your specific application.

Final Thoughts

If your 2021 Chevy Blazer is showing signs of a failing fuel pump control module, don’t wait. The symptoms—crank no-start, stalling, rough running, and electrical oddities—are all consistent with a known GM issue. The fix is a K111 FPDCM replacement, and in most cases, it’s covered under the Federal Emission Warranty up to 8 years or 80,000 miles.

Take your vehicle to a dealer, reference Bulletin #24-NA-139, and save yourself the headache. And if you ever need a replacement fuel pump—whether for your Blazer or another vehicle—remember that KEMSO offers a lifetime warranty and high-quality OEM-replacement options at https://www.kemsoracing.com/.


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