CM850 Electronic Control System – FAULT CODE 957

EGR Valve Position – Data Erratic, Intermittent, or Incorrect


Fault Code: 957
PID: P27
SPN: 27
FMI: 2
LAMP: Amber

EGR Valve Position – Data erratic, intermittent, or incorrect. Intermittent EGR position information is being received by the electronic control module

Possible low power. EGR valve will be closed.

EGR Valve Position Circuit

Circuit Description

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

Component Location

The EGR valve position sensor is located on the EGR valve 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 EGR valve position sensor. This failure causes erratic readings of EGR valve position. The troubleshooting information for fault code 957 is the same as fault code 1228. Refer to fault code 1228 for the fault code troubleshooting information.

Refer to Troubleshooting Fault Code t05-957

Last Modified:  08-Jul-2010