C1642 serious

CAN Communication Failure — ABS/ESC (ESP) (Hyundai/Kia/Genesis)

The C1642 code means the vehicle's onboard diagnostic system has detected: CAN Communication Failure — ABS/ESC (ESP) (Hyundai/Kia/Genesis). This is a serious severity code.

My Garage →
Keep driving?
Yes, but fix soon
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. C1642 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 C1642?

  • 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 C1642? (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 C1642?

Yes, but fix soon. C1642 is rated serious severity. It is not an immediate stop-driving fault, but it will not clear itself — book the repair rather than ignoring the light.

Frequently Asked Questions

Can I keep driving with C1642?

Yes, with the repair booked. ABS and stability control are offline while this is set. Base hydraulic braking is unaffected, so the vehicle stops normally - but expect no ABS in an emergency stop and no stability intervention, which matters most on wet or loose surfaces.

Does C1642 mean the same thing on every vehicle?

No. C1642 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 C1642 most likely indicate?

CAN Communication Failure — ABS/ESC (ESP) (Hyundai/Kia/Genesis). Treat this as a general guide and verify the specifics for your vehicle.

Mechanics Guide Step-by-step diagnosis

How Do You Diagnose C1642?

  1. Confirm your exact make, model, and year first — C1642 is manufacturer-specific and can mean different things across brands.

  2. Read C1642 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 C1642?

  • 2017-2023 Ford Expedition
  • 2015-2023 Chevrolet Tahoe
  • 2016-2023 Toyota Sequoia
  • 2018-2023 Nissan Titan

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