GM OBD Trouble Code 47

UART (Serial Data) Circuit Error

The Serial Data circuit allows the ECM to communicate with other vehicle modules and permits the sharing of information between the modules. Code 47 will be set if the ECM determines there is a fault with the Serial Data circuit.

Fault Code Description

  • 47 - UART (serial data) circuit error


  • Engine may not start
  • Communications with other on-board modules will be lost

Common Problems

  • Internal failure of ECM or other on board module
  • Wiring issue with the Serial Data circuit

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