DTC Troubleshooting: P2454 (187)
DTC P2454:
 DPF Differential Pressure Sensor Circuit Low Voltage
NOTE: Before you troubleshoot, record all freeze data and review the general troubleshooting information.
  1. Turn the ignition switch ON (II).
  1. Check the DIESEL PARTICULATE FILTER (DPF) DIFFERENTIAL PRESSURE SENSOR in the DATA LIST with the HDS.
Is about 0.35 V or less indicated?
YES -
Go to Step 3 .
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the DPF differential pressure sensor and the ECM.■
  1. Turn the ignition switch OFF.
  1. Disconnect the DPF differential pressure sensor 3P connector.
  1. Turn the ignition switch ON (II).
  1. Check the DIESEL PARTICULATE FILTER (DPF) DIFFERENTIAL PRESSURE SENSOR in the DATA LIST with the HDS.
Is about 0.35 V or less indicated?
YES -
Go to Step 7 .
NO -
Go to Step 10 .
  1. Turn the ignition switch OFF, and wait 2 minutes.
  1. Disconnect ECM connector No. 1 (96P).
  1. Check for continuity between DPF differential pressure sensor 3P connector terminal No. 2 and body ground.
Is there continuity?
YES -
Repair short in the wire between the DPF differential pressure sensor and ECM connector No. 1 terminal No. 43, then go to Step 17 .
NO -
Go to Step 21 .