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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

26042

Communication error, KPP/KSP (axis)

Kuka · KR C4 extended

What does 26042 mean?

A communication error has occurred on the controller bus involving the KPP or KSP module for a specific axis. This indicates a disruption in data exchange, preventing the controller from properly commanding or monitoring the drive.

Common Causes

  • EtherCAT cabling is damaged or improperly connected.
  • EtherCAT stack malfunction.
  • CCU module fault.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Reinitialize the drive bus: Power Off / Power On.

  2. 2

    Inspect EtherCAT cabling for damage and correct connections.

  3. 3

    Check EtherCAT stack status.

  4. 4

    Check the CCU module.

  5. 5

    Check the KPP module.

  6. 6

    Check the KSP module.

Browse all codes in this manual (35)
Verified technical data. Last updated: April 2026

Related Faults

26030Device state: OK26031Internal error, KPP/KSP (axis)26032IxT overload error, KPP/KSP (axis)
Source: Kuka KR C4 extended
Open Manual (Page 234)Search more codes in this manual