B0423 04 - GMC Diagnostic Trouble Code (DTC) Definition, Causes ...

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Home GMCB0423 04 GMC GMC DTC B0423 04 Make: GMC Code: B0423 04 Definition: Transmission Fluid Temperature (TFT) Sensor Performance Description: No ECT DTC P0117 or P0118. No input speed sensor (ISS) DTCs P0716 or P0717. No output speed sensor (OSS) DTCs P0722 or P0723. DTC P0711 has not passed in the current ignition cycle. The transmission fluid temperature is -40 to +150°C (-40 to +302°F). Condition 1 The engine coolant temperature (ECT) is at least 70°C (158°F) and has changed by 55°C (131°F) since start up. The vehicle speed is 8 km/h (5 mph) or more for at least 5 minutes cumulative. The torque converter clutch (TCC) slip is 120 RPM or more for at least 5 minutes cumulative. Condition 2 The engine coolant temperature is at least 70°C (158°F) and has changed by 55°C (131°F) since start up. The vehicle speed is 8 km/h (5 mph) or more for at least 5 minutes cumulative. Condition 3 The calc. throttle position is between 8 and 90 percent. The engine torque is 50 N·m (37 lb ft) or more. The vehicle speed is 8 km/h (5 mph) or more. The engine speed is greater than 500 RPM. Cause:
  • One of the following conditions occurs:
  • Condition 1
  • The transmission fluid temperature at startup is -40 to +20°C (-40 to +68°F).
  • The vehicle speed is greater than 8 km/h (5 mph) for 300 seconds (5 minutes) cumulatively.
  • The transmission fluid temperature has not changed by more than 2°C (4°F) since startup for 80 seconds.
  • Condition 2
  • The transmission fluid temperature at startup is 129-149°C (264-300°F).
  • The vehicle speed is greater than 8 km/h (5 mph) for 300 seconds (5 minutes) cumulatively.
  • The transmission fluid temperature has not changed by more than 2°C (4°F) since startup for 80 seconds.
  • Condition 3
  • The transmission fluid temperature has changed by 20°C (36°F) or greater within 250 milliseconds; 14 times within 7 seconds.
Failure Type: System Internal FailureThis sub type is used for control module Internal Failures that cannot be assigned to a specific sub type.

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