CM850 Electronic Control System – FAULT CODE 2388

Variable Geometry Turbocharger Actuator Position Failed Automatic Calibration Procedure – Out of Calibration


Fault Code: 2388
PID: S269
SPN: 2795
FMI: 13/13
LAMP: Amber

Variable Geometry Turbocharger actuator position failed automatic calibration procedure – out of calibration.

Variable Geometry Turbocharger Possible low power. Variable Geometry Turbocharger actuator will remain either open or closed.

Turbocharger Actuator Motor Circuit

Circuit Description

The electronic control module (ECM) periodically checks and adjusts the zero position of the turbocharger position sensor when the turbocharger is closed. This self-calibrating feature adjusts for wear and unit-to-unit variation of position sensors and actuator assemblies. This fault is logged if the position sensor reading is outside the calibrated limits.

Component Location

The turbocharger position sensor is mounted on the turbocharger actuator assembly on the bearing housing of the turbocharger. Refer to Procedure 100-002 in Section E for a detailed component location view.

Shop Talk

A possible cause of this fault code could be a turbocharger internal failure causing the turbocharger actuator to not close fully.

When troubleshooting inactive counts of this fault code, running the Turbocharger Actuator Test in INSITE™ electronic service tool could help to identify a stuck turbocharger actuator.

Refer to Troubleshooting Fault Code t05-2388

Last Modified:  08-Jul-2010