Carriage Error: Carriage System Failure
Last updated: February 16, 2026
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How to troubleshoot carriage jams in the HP DesignJet T850/T858/T870/T950/XT950/T918 printer series
Learn how to troubleshoot carriage jams in the HP DesignJet T850 / T858 / T870 / T950 / XT950 / T918 printer series. Chapters: ...
This is a general critical error indicating a failure within the entire carriage system. The carriage cannot move or operate correctly.
- 1Faulty carriage motor preventing movement along the scan axis.
- 2Damaged or worn carriage belt, leading to slippage or complete detachment.
- 3Encoder strip is dirty, scratched, or detached, causing the carriage to lose positional awareness.
- 4Obstruction in the carriage path (e.g., paper jam, foreign object) physically blocking movement.
- 5Defective trailing cable or main PCA, failing to transmit power or control signals to the carriage assembly.
- Printer displays error code 0x00C20002 on the front panel.
- Carriage remains stationary or attempts to move but makes grinding/stalling noises.
- Carriage moves erratically or only a short distance before stopping.
- Printer fails to initialize or complete the start-up sequence.
- Visible signs of damage to the encoder strip (e.g., tears, smudges) or carriage belt (e.g., fraying, looseness).
- 1
Turn off the printer and unplug it. 2. Open the top cover and gently try to move the carriage manually. 3. Inspect the carriage path, encoder strip, and drive belt for obstructions or damage. 4. Plug in and restart the printer. If the error persists, service is required.
This is a broad error. Start with the simplest checks: encoder strip cleanliness and carriage freedom of movement. Don't overlook the service station's role in carriage movement. A failing scan-axis motor can often produce grinding noises.
Reference diagrams for common repair procedures related to this error:
Carriage Belt Replacement

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 complete system that stores, transports, and delivers ink from the cartridges to the printheads, including tubes, valves, and pressure regulators.
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