Creality K2 Pro Error Codes Troubleshooting for Common Issues

When using the Creality K2 Pro, error codes are designed to quickly point out hardware, firmware, or operational issues. When a fault prompt appears, just look at the numbers (the English letter code in front indicates the faulty module). 

This guide groups common Creality K2 Pro error codes by system module, explains their causes, and provides clear troubleshooting actions.

Note: The error code consists of the fault location code and error number. You can only enter the numeric code for a query.

Creality K2 Pro Error Codes – Troubleshooting Table

Creality K2 Pro Common Error Troubleshooting Guide

BM0111 Error – Hotend Connection Abnormal

Error message:

BM0111 – Hotend connection abnormal

What happens

The screen displays BM0111, indicating abnormal communication between the mainboard and the nozzle adapter board.

Possible causes

• Power or communication issue between the nozzle board and adapter board
• Loose or damaged nozzle cable
• Faulty nozzle board or adapter board

How to troubleshoot

1. Check whether the nozzle board shows a blue indicator light when the error appears.

2. If no blue light is present, confirm the adapter board supplies 24V power to the nozzle board.

3. Power off the printer and disconnect all cables from the nozzle board except the nozzle cable, then power on again to rule out interference from other modules.

4. Inspect the nozzle board, nozzle cable, and adapter board for burn marks, cold solder joints, cable damage, or poor contact.

5. If the issue persists, replacing the nozzle board and nozzle cable is recommended.

6. If replacement does not resolve the issue, contact Creality support.

AC0101 – Print Quality Issue Detected (AI Detection)

Applicable models: K1C, K1 Max, K2 Plus, K2 Pro

Why it appears

This AI feature detects print failures during printing, mainly used to identify issues such as spaghetti failures.

How to solve it

• If false alarms occur frequently, go to Settings → Camera → AI Functions and disable “Pause on fault” or turn off AI detection.
• If failures are often missed, increase sensitivity to Professional mode.

CL2536 – Leveling Sensor Hardware Failure

Applicable models: K1 Series, V3 Series, K2 Plus, K2 Pro

Why it appears

The leveling sensor detects a possible hardware malfunction, affecting Z-axis homing and auto leveling.

Troubleshooting steps

1. Check sensor cables for looseness or detachment.

2. Ensure no debris interferes with sensor operation.

3. Restart the printer and perform Z-axis homing.

4. If the issue remains, replacing the leveling sensor is recommended.

TE2761 – Unable to Read Extruder Leveling Sensor Data

Applicable models: K2 Plus, K2 Pro

Why it appears

The SYNC signal self-check fails, often caused by poor cable contact between the extruder and mainboard.

Solutions

• Check the nozzle ribbon cable and communication bus connections.
• Reseat all related cables and ensure firm connections.
• Replace damaged ribbon cables if necessary.
• Perform Z-axis homing to confirm recovery.

Error Code 2355 – Extruder Communication Abnormal

Typical symptoms

Common causes

• Poor contact in the extruder drag chain cable
• Cooling fan cable being pinched by mounting hardware

Troubleshooting

1. Restart the printer and see if the issue reoccurs.

2. Remove the right-side extruder cooling fan and inspect cable routing.

3. Reseat fan cables and nozzle board connectors.

4. Reinsert or replace the extruder drag chain cable if necessary.

5. If unresolved, export logs for further analysis.

Extruder Clogging & Filament Jamming

Typical symptoms

• Filament expands or bends inside the extruder
• Material accumulates and fails to feed into the hotend

Key causes

• Chamber temperature too high for the filament (e.g., PLA softening early)
• Extruder cooling fan not spinning
• Nozzle or heat break blockage

Fixes

• Verify correct chamber temperature for the filament type
• Confirm extruder cooling fan operation at 100 °C
• Heat nozzle to printing temperature and clear blockage with a cleaning needle
• Replace the integrated nozzle if clogging cannot be removed

K2 Series Screen Abnormal Trigger

Typical symptoms

Possible causes

• Screen ribbon cable not fully seated
• Strong electromagnetic interference nearby
• Poor grounding causing static interference
• Defective screen hardware

Solutions

• Reseat the screen cable
• Test the printer in an open area away from high-power devices
• Check whether the power outlet is properly grounded
• Replace the touchscreen if necessary

Filament Purge Stuck at 300 °C (K2 / K2 Pro)

Issue Description

On K2 / K2 Pro printers (firmware version ≤ 1.1.0.92), after printing with high-temperature filaments such as Creality Hyper PA612-CF, switching to low-temperature materials like PLA may cause the filament purge process to stall at 300 °C, with no purge action executed.

Root Cause

1. The printer’s nozzle maximum temperature is limited to 300 °C

2. High-temperature filaments (e.g., nylon) require 300–320 °C

3. The purge logic works as follows:

• First purges at the maximum temperature of the previous filament
• Then gradually cools down

4. When the purge process requires 320 °C, but the printer is capped at 300 °C, the workflow becomes stuck

Temporary Workaround (Recommended)

Modify Parameters via Fluidd

1. Open a browser and access: http:// (printer_ip ):4408
Example: http://172.18.208.169:4408

2. Go to Configuration Files and locate printer_params.cfg

3. Modify the nozzle maximum temperature limit

4. Save the file; Klippy will restart automatically

5. After reboot, the purge process should resume normally

Note: This is a temporary workaround. A firmware update is recommended for a permanent fix.

Regular Arc Patterns and Surface Artifacts in High-Speed Printing (Kipper Series)

Issue Description

When printing models with dense small-arc surface geometry at high speed using the official slicer, irregular layer artifacts may appear.

Root Cause

• The model geometry triggers Arc Fitting
• Current firmware has precision conversion issues with arc fitting
• Errors become more noticeable at higher speeds

Short-Term Optimization (Best Results)

1. Disable Arc Fitting: Slicer → Quality → Turn off Arc Fitting

2. Enable Non-Decelerated Outer Wall: Filament Settings → Cooling → Enable Non-Decelerated Outer Wall

3. For higher quality requirements: Reduce printing speed appropriately

Model Collision During Sequential Printing (Temporary Fix)

Issue Description

When using Sequential Printing:

• Taller models are printed first
• Shorter models are printed afterward
• After completing a model, the nozzle retracts or homes without lifting the Z axis
• This may cause the nozzle to collide with and knock over previously printed tall models

Root Cause

A logic handling issue between the slicer and firmware in sequential printing mode

Temporary Solution

• Open the slicer and select the target printer (K2 Pro used as example)
• Go to Edit Printer → Extruder G-code
• Add the following command to the End G-code:【G1 Z300 F600】
• Notes:
  • 300 is the maximum Z height of the K2 Pro
  • For other models, replace this value with the actual maximum Z height
  • Users must adjust this value according to their printer model

Nozzle / Heated Bed Temperature Fluctuations Causing Errors or Long Wait Times

Issue Description

1. Nozzle temperature fluctuates more than ±5 °C around the target temperature, eventually triggering Error 2564

2. The heated bed reaches the target temperature but cannot cool down properly, remaining stuck in a waiting state

Root Cause

• Unstable nozzle power control
• Unstable heated bed power control

Solution 1: Nozzle PID Calibration

1. On the printer screen, go to Settings → Expert Mode

2. Select Nozzle PID Calibration

3. Choose a commonly used printing temperature and tap Start

4. Calibration takes approximately 5 minutes

5. Restart the printer after calibration completes

Solution 2: Heated Bed PID Calibration (via Fluidd)

1. Access Fluidd: http://（printer_ip）:4408

2. Enter the following command in the console: BEDPID

3. The bed will automatically cycle between 100 °C and 95 °C for calibration (about 20 minutes)

4. After completion, enter: save_config

5. The system will save the parameters and reboot automatically

Startup Error 2001 Caused by Corrupted Files

Applicable Scenario

• Printer shows Error 2001 immediately on startup
• System cannot enter the normal operating interface

Solution (via SSH)

1. Install MobaXterm: https://mobaxterm.mobatek.net/download.html

2. Log in via SSH (printer IP can be found in Settings → Network)

3. Enter the password：creality_2024

4. Delete the corrupted file: rm /mnt/UDISK/creality/userdata/config/user_print_refer.json

5. Run: sync

6. Reboot the printer to restore normal operation

First Layer Adhesion & Layer Compression on K2 Pro

Issue Description

• The first layer does not adhere to the build plate
• The nozzle scrapes the build plate
• Severe first-layer compression occurs

Possible Causes

• The build plate surface is contaminated by hand sweat or fingerprints, reducing adhesion
• Improper bed leveling, causing the first layer to fail
• Build plate temperature is too low for the selected filament, leading to shrinkage and detachment
• Residual filament on the nozzle affects homing, resulting in incorrect Z-zero and an overly high first layer
• Abnormal strain gauge behavior causes inaccurate compensation data, leading to excessive layer compression and nozzle scraping

Troubleshooting & Solutions

3.1 Clean the Build Plate

• If fingerprints, sweat marks, or dirt are visible, clean the plate with detergent and water
• For heavy glue residue or after multiple prints, rinse thoroughly with water and dry completely

3.2 Apply Glue Correctly

• Use the official glue stick supplied with the machine (see Figure 1)
• Apply a thin, even layer of glue to the print area to improve adhesion

3.3 Check Whether Print Calibration Is Required

Print Calibration includes:

• Auto bed leveling
• Flow calibration
• First-layer detection (flow calibration and first-layer detection are disabled by default)

If Print Calibration is not selected, these processes will not run.

Print Calibration is required when:

• Switching filament types (e.g., PLA to ABS), as bed temperatures and leveling data differ
• The machine has been moved
• A firmware upgrade has been performed

Print Calibration is not required when:

• Reprinting the same model successfully
• Printing a small model at the center of the build plate

Manual leveling is recommended when:

• The bed surface is visibly uneven
• Adjust the hand nuts beneath the heated bed to achieve basic flatness before running Print Calibration

3.4 Check Mechanical Stability

• Inspect whether the printhead or heated bed is loose
• Tighten all fasteners if necessary

3.5 Slicer Recommendation

Use the official Creality slicer with default parameters for the selected filament to avoid compatibility issues

3.6 Fine-Tune Z-Offset

Adjust the Z-offset slightly based on actual first-layer print results if needed

K2 Pro X/Y Servo Motor Calibration Procedure

When Calibration Is Needed

Servo motor calibration is required if:

• Motors behave abnormally
• Unusual noise occurs
• Protection errors are triggered frequently

These issues may indicate that the servo motor electrical zero position has shifted.

Required Tool

Calibration results must be verified using the Fluidd interface:

1. Open a browser on your computer

2. Obtain the printer’s IP address from the machine’s Network settings

3. Enter the IP address with port :4408 (example: http://192.168.1.1:4408) to access Fluidd

Calibration Steps

Step 1: Prepare the Machine

• Ensure the motors are disabled (tap Motor Unlock on the touchscreen)
• Move the printhead to the center of the machine
• Push the heated bed to the lowest position

Step 2: Log in to Fluidd

• Open a browser and enter the printer IP address followed by :4408
• Access the Fluidd interface

Step 3: Execute Calibration Commands

Run the following commands in order and wait approximately 3 minutes for completion:

MOTOR_FLASH_PARAM NUM=1 DATA=6 PARAMS_TYPE=float ID=9
MOTOR_FLASH_PARAM NUM=1 DATA=6 PARAMS_TYPE=float ID=25
MOTOR_FLASH_PARAM NUM=2 DATA=6 PARAMS_TYPE=float ID=9
MOTOR_FLASH_PARAM NUM=2 DATA=6 PARAMS_TYPE=float ID=25
MOTOR_ELEC_OFFSET_CALIBRATE NUM=1
MOTOR_ELEC_OFFSET_CALIBRATE NUM=2

Important:

Do not power off the machine during calibration, as this may cause abnormal behavior.

Verification

• After calibration, perform a homing operation
• If homing completes without errors, calibration was successful
• If an error appears after homing, calibration has failed

In case of failure, please capture screenshots of the calibration process and contact Creality after-sales technical support for further assistance.

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