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

Symptoms

  • 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

Related Questions

See what others have asked about this, or visit the Questions page to ask your own question.
2000 Chevrolet Silverado 2500
Data link connector will not start. looking for the fuse to run the data link
2006 Chevrolet Uplander
Ran a scan u1300 class 2 short to ground. u1300 data link low. u1301 data link high. lights have been flickering...