Carriage – Carriage PCA comms error
Last updated: February 22, 2026
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Carriage PCA cannot communicate with Engine PCA
- 1
Check the Trailing cable from the Engine PCA to the Carriage PCA. Run the 08601 Checks Electronics service diagnostic. Replace the Carriage PCA. Replace the Trailing cable. Replace the Engine 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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Related Questions
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.
A numeric or alphanumeric code displayed on the printer's front panel or in diagnostic logs that identifies a specific hardware or software malfunction.
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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