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tmc_connection_error
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Creality · FDM 3D Printers
UART Communication Failure With TMC Stepper Driver
Quick Answer
Error code TMC_CONNECTION_ERROR on your Creality FDM 3D Printers means: UART Communication Failure With TMC Stepper Driver. This is usually fixable — see the step-by-step guide below.
Likely Causes
  1. UART wiring between MCU and TMC driver has a broken trace or loose connection
  2. Mainboard firmware does not have TMC UART mode properly configured
  3. EMI interference on the UART communication lines
  4. Driver chip has failed and no longer responds to UART commands
How to Fix It
1
Power cycle the printer and check if the error clears on restart
2
In Klipper, run DUMP_TMC STEPPER=stepper_x (or relevant axis) to check communication
3
Verify UART configuration in printer.cfg (for Klipper) or Configuration_adv.h (for Marlin)
4
Inspect the mainboard for any visible damage, burnt components, or cold solder joints near the TMC drivers
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Replacement mainboard (most Creality boards have onboard TMC drivers)
USB-to-serial adapter for firmware debugging
Related Error Codes
THERMAL_RUNAWAYHEATING_FAILEDBED_THERMAL_RUNAWAYBED_HEATING_FAILEDMINTEMP
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