CM850 Electronic Control System – FAULT CODE 1229

VGT Position Sensor – Data Erratic, Intermittent, or Incorrect


Fault Code: 1229
PID: S27
SPN: 2795
FMI: 2/2
LAMP: Amber

VGT Position Sensor – Data erratic, intermittent, or incorrect. Intermittent variable geometry turbocharger (VGT) position information is being received by the electronic control module (ECM).

Possible low power. Power to the turbocharger actuator will be limited.

Turbocharger Position Sensor Circuit

Circuit Description

The turbocharger position sensor outputs a voltage signal to the ECM. The ECM converts this signal into a percentage value, 0 to 100 percent, indicating turbocharger position. A fully closed turbocharger actuataor is equivalent to 100 percent.

Component Location

The turbocharger position sensor is located on the variable geometry turbocharger (VGT) actuator assembly. Refer to Procedure 100-002 for a detailed component location view.

Shop Talk

This fault code is caused by an internal failure of the variable geometry turbocharger (VGT) position sensor. This failure causes erratic readings of variable geometry turbocharger (VGT) position.

Refer to Troubleshooting Fault Code t05-1229

Last Modified:  08-Jul-2010