Error 02.0Critical Severity

System Error: Carriage PCA Malfunction

Last updated: February 21, 2026

Severity:Critical Severity

Affected:18 models

DIY Fix:Professional Recommended

HP printer fix - carriage error message

Instructions where to clean inside the HP printer.

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What This Error Means

This error indicates a problem with the carriage assembly's printed circuit board. This board controls the printheads and their communication with the main PCA.

Common Causes

1Faulty Carriage PCA (Printed Circuit Assembly) itself, leading to incorrect signal processing or power delivery to printheads.
2Damaged or worn Flexible Flat Cable (FFC) connecting the Carriage PCA to the main PCA, causing intermittent or complete loss of communication.
3One or more defective printheads drawing excessive current or shorting, which can overload or damage the Carriage PCA's circuitry.
4Contamination (e.g., ink, dust) on the Carriage PCA's connectors or components, interfering with electrical contacts.
5Damage to the carriage assembly's electrical contacts that interface with the printheads, preventing proper communication or power supply.

Symptoms to Watch For

Printer displays "02.0 System Error: Carriage PCA Malfunction" on the front panel.
Printheads are not detected or appear to be missing, even when correctly installed.
Printer fails to initialize or move the carriage assembly during startup or printing.
Intermittent or complete loss of communication with one or more printheads, leading to blank prints or missing colors.
Unusual noises from the carriage assembly, such as grinding or clicking, sometimes preceding the error.

Step-by-Step Troubleshooting Guide

1
Turn off the printer and unplug it. 2. Open the top cover and gently move the carriage manually to the center. 3. Inspect the carriage area for any obstructions or loose cables. 4. Plug in and turn on the printer. If the error persists, contact support.

Pro Tips from Experts

Often, a faulty printhead can cause this error, so try replacing printheads one by one if you suspect one is bad. Check the trailing cable connection to the carriage PCA very carefully. A damaged trailing cable can also cause this error. **Part Numbers & Advanced Troubleshooting:** - Carriage PCA: C7769-60374 (24"), C7769-60065 (42") - Trailing Cable: C7769-60147 - Engine PCA: C7769-60384 - Formatter Board: C7769-60319 (check revision A/B) - Service Station: C7769-60374 **Diagnostic Procedures:** 1. Access Service Menu: Hold Down + Right arrow during boot 2. Run Carriage Scan Test: Service Menu > Tests > Carriage Scan 3. Check voltage at Carriage PCA: Should read 24V DC 4. Inspect trailing cable for cracks or wear at fold points

Technical Service Diagrams

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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Printers Affected by This Error (18)

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Glossary Terms

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Related Glossary Terms

Printhead

The component that deposits ink onto the media. DesignJet printers use thermal inkjet printheads that fire tiny droplets of ink through microscopic nozzles.

Carriage Assembly

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.

PCA (Printed Circuit Assembly)

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.

Cutter Assembly

The built-in blade mechanism that automatically cuts media after each print job or at specified intervals.

Printhead Alignment

A calibration process that ensures all printheads are precisely aligned relative to each other for accurate color registration and sharp output.

Head Strike

When the printhead physically contacts the media surface during printing, potentially damaging both the print and the printhead.

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