U2401 moderate

Fuel Injector Control Module — High-Speed CAN Bus "Off" (GM/Duramax)

The U2401 code means the vehicle's onboard diagnostic system has detected: Fuel Injector Control Module — High-Speed CAN Bus "Off" (GM/Duramax). This is a moderate severity code.

My Garage →
Keep driving?
Short distances only
DIY difficulty
hard
Estimated cost
Varies — depends on the specific component this manufacturer-specific code points to on your vehicle. Diagnose before buying parts.

Manufacturer-specific code. U2401 is a manufacturer-specific DTC, so its exact definition can differ by make, model, and year. Use the meaning above as a general guide, and always confirm it against your vehicle manufacturer's official service information (or a make-specific scan tool) before diagnosing or replacing parts.

What Are the Symptoms of U2401?

  • Check Engine or a related warning light on
  • Exact symptoms depend on the specific system this code covers for your make
  • A make-specific scan reveals which subsystem and circuit is involved

What Causes U2401? (Most Likely First)

  • A fault in the specific component or circuit this code monitors (the exact part varies by manufacturer) High
  • Damaged wiring, a corroded connector, or a poor ground in that circuit Moderate
  • A related sensor or control module reporting or causing the fault Moderate

Can I Still Drive with U2401?

Short distances only. U2401 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.

Frequently Asked Questions

Does U2401 mean the same thing on every vehicle?

No. U2401 is a manufacturer-specific diagnostic trouble code, so its exact meaning varies by make, model, and year. Always confirm it against your vehicle manufacturer's service information before diagnosing or replacing parts.

What does U2401 most likely indicate?

Fuel Injector Control Module — High-Speed CAN Bus "Off" (GM/Duramax). Treat this as a general guide and verify the specifics for your vehicle.

Mechanics Guide Step-by-step diagnosis

How Do You Diagnose U2401?

  1. Confirm your exact make, model, and year first — U2401 is manufacturer-specific and can mean different things across brands.

  2. Read U2401 with an enhanced/make-specific scan tool and check your manufacturer's official service information for the precise definition and procedure.

  3. Inspect the wiring, connectors, and grounds for the indicated circuit before replacing any part.

Which Vehicles Commonly Get U2401?

  • 2014-2022 Mercedes-Benz CLA (C117/C118)
  • 2015-2023 Mercedes-Benz GLA (X156/H247)
  • 2016-2024 Mercedes-Benz S-Class (W222/W223)
  • 2019-2025 Mercedes-Benz GLB (X247)

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