5036355 JOHNSON O RING, PROTECTION COVER

Table 1
Diagnostic Trouble Codes for Active Analog Sensors    
J1939 Code    Description    Callout in the Illustrations for Component Location    Location of the Connector for the Sensor    Notes    
3242-2     Diesel Particulate Filter Intake Gas Temperature (bank 1) : Erratic, Intermittent, or Incorrect     18     17     The ECM compares the signals from the three sensors for a DPF whenever the following conditions are met:
The keyswitch is turned to the ON position.
15 seconds elapse.
There are no -3 codes or -4 codes for any of the sensors.
The engine is started.
The ECM verifies that the signal from each sensor is on the appropriate terminal of the P2 connector. The ECM activates a -2 code if a signal is detected on the wrong terminal or if the signal is incorrect.
The following conditions can cause a -2 code:
The sensor group for the DPF is electrically connected to the wiring. However, the sensor group is not mechanically connected to the DPF.
There is a loose clamp in the exhaust piping between the outlet of the Aftertreatment Regeneration Device (ARD) and the inlet to the DPF.
The tubes between the DPF and the sensor group are obstructed. This can be caused by a buildup of soot inside the tubes. This can also be caused by frozen condensation inside the tubes.
There is a problem with the wiring between the sensor group and the ECM. Usually, this problem occurs in the harness that is provided by the vehicle manufacturer.    
3246-2     Diesel Particulate Filter Outlet Gas Temperature (bank 1) : Erratic, Intermittent, or Incorrect    
3251-2     Diesel Particulate Filter