System error when auto level. Malfunctioning sensor in printer head assembly?

Flagship K Series Creality Flagship K2 Plus & CFS
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1

I’m troubleshooting a Creality K2 Pro with intermittent auto-level failures.

Symptoms:

  • During auto leveling, the bed moves upward until a loud mechanical “bang” occurs, as if the printer fails to detect nozzle contact with the bed.

  • The process aborts with “System error”.

  • Sometimes the left side probing works but the right side fails, and sometimes it fails already on the left side.

  • The problem appears intermittent rather than permanently failed.

Based on available reports and Creality documentation, the most commonly suspected causes seem to be:

  1. Toolhead cable / printhead cable (intermittent connection or broken wire)

  2. Strain gauge (force sensor used for nozzle contact detection)

  3. Toolhead board / hotend adapter board

  4. Mechanical issue in the hotend assembly

Current planned troubleshooting order:

  1. Inspect and reseat all toolhead connectors and cables

  2. Inspect toolhead cable for damage, stress, or intermittent faults

  3. Replace toolhead cable if needed

  4. Replace strain gauge if the issue persists

I have not found enough evidence to confidently identify a single root cause, so I’m interested in hearing from others who experienced similar symptoms on K2/K2 Pro/K2 Plus printers:

  • What was the actual root cause?
  • Which component solved the issue?
  • Did the failure start intermittently like this?
2

i am having these same issues., trashed my print plate tooo. Creality have a answer for this?