Symptoms and Severity
Conditions that may lead to the storage of this code should be considered urgent as they can damage the internal engine or fuel system. Symptoms of a P2454 code may include:
- Increased engine temperatures
- Transmission temperatures higher than normal
- Decreased engine performance
- Excessive black smoke from the exhaust
The potential causes for setting this code are as follows:
- Exhaust leaks
- Clogged DPF pressure sensor tubes/pipes
- Open or shorted circuit(s) in the DPF pressure sensor A circuit
- Faulty DPF pressure sensor
Diagnostic and Repair Procedures
A good starting point is always to check the technical service bulletins (TSBs) for your specific vehicle. Your issue might be a known problem with a published fix from the manufacturer, which can save you time and money during diagnosis.
A digital volt/ohmmeter, a manufacturer’s service manual, and a diagnostic scanner will be needed to diagnose a P2454 code.
Begin your diagnosis with a visual inspection of the related wiring harnesses and connectors. Carefully inspect wiring routed near hot exhaust components and/or sharp edges. Test the alternator output, battery voltage, and battery terminal ends at this time.
You can continue by connecting the scanner and retrieving all stored codes and freeze frame data. Be sure to note this information for future reference. Now, clear all recorded codes and test the vehicle. Using the DVOM, test the DPF pressure sensor. Refer to the manufacturer’s maintenance manual for instructions. The sensor should be replaced if it does not meet the manufacturer’s resistance specifications.
The DPF pressure sensor supply hoses should be checked for obstructions and/or damage if the sensor checks out. Replace hoses as needed (high-temperature silicone hoses are recommended).
You can begin testing the system circuits if the supply lines are intact and the sensor is operational. Before testing circuit resistance and/or continuity (with the DVOM), disconnect all related controllers. Open or shorted circuits should be repaired or replaced.
Additional Diagnostic Notes:
- Repair exhaust leaks before attempting to diagnose this code
- Clogged sensor ports and blocked sensor tubes are common
- DPF pressure sensor hoses that have melted or been cut may need to be rerouted after replacement