Firmware has detected an unsupported Carriage PCA version
Last updated: February 22, 2026
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HP Z9+ System error: 0021-0002-0017
Firmware has detected an unsupported Carriage PCA version
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Make sure that the printer has the latest firmware version. Upgrade the firmware version. Run the 08601 Checks Electronics service diagnostic. Replace Carriage PCA.
Reference diagrams for common repair procedures related to this error:
Carriage Belt Replacement
Formatter Board Location & Connections
Note: These diagrams are for reference only. Always consult official HP service documentation and follow proper ESD precautions.
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The internal software embedded in the printer that controls all hardware operations, user interface, network connectivity, and print processing.
The mechanism that moves the printheads back and forth across the media during printing. It rides on a guide rail and is driven by the scan-axis motor via a belt.
The main logic board inside an HP DesignJet printer that controls all operations, including processing print jobs, managing ink delivery, and communicating with connected devices.
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