CM870 and ISX Engines – FAULT CODE 2277

Variable Geometry Turbocharger Output Device Driver – Shorted High


Fault Code: 2277
PID: S27
SPN: 641
FMI: 3/3
LAMP: Amber

Variable Geometry Turbocharger Actuator Driver Circuit – Voltage Above Normal or Shorted to High Source. Open circuit or high voltage detected at turbocharger control valve circuit.

The variable geometry actuator will go to either the fully open or fully closed position.

Turbocharger Control Valve Circuit

Circuit Description

The electronic control module (ECM) controls the variable geometry actuator position with the turbocharger control valve. The turbocharger control valve controls the air pressure to the variable geometry actuator when commanded by the ECM. ECM commands are sent to the control valve through the turbocharger control valve signal of the ECM engine harness. The turbocharger control valve is grounded to the engine block through the turbocharger control valve return wire, not back to the ECM. The turbocharger control valve, Centinel™ oil control valve, and turbocharger control shutoff valve share the same return wire in the engine harness.

Component Location

The turbocharger control valve is mounted on top of the alternator/refrigerant compressor mounting bracket. Refer to Section E for a detailed component location view.

Shop Talk

Turbocharger Control Valve Command can be monitored with the INSITE™ electronic service tool. This parameter represents the ECM command to the turbocharger control valve which in turn controls the variable geometry actuator position.

Possible causes for this fault code include:

  • Open circuit in the engine harness, connectors, or turbocharger control valve.
  • Signal circuit short to voltage source in the engine harness.

Refer to Troubleshooting Fault Code t05-2277

Last Modified:  01-Sep-2010