Symptoms and Severity
The conditions that could lead to this code may also cause internal damage to the engine or fuel system and should be considered urgent. Symptoms of a P2461 code may include:
- Excessive black smoke from the exhaust
- Increased engine temperatures
- Transmission temperatures higher than normal
- Decreased engine performance
Causes
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 circuit B
- Faulty DPF pressure sensor
- The diesel exhaust fluid tank may be empty
- Poor quality diesel exhaust fluid
- Ineffective DPF regeneration
- The active DPF regeneration system is inoperative
Diagnostic and Repair Procedures
A good starting point is always to check the technical service bulletins (TSB) 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.
To diagnose a P2461 code, a digital volt/ohmmeter, the manufacturer’s service manual, and a diagnostic scanner will be needed.
I recommend starting your diagnosis with a visual inspection of the related wiring harnesses and connectors. Inspect the wiring routed near hot exhaust components and/or sharp edges. Be sure to check the alternator output, battery voltage, and battery terminal ends at this time.
Continue by connecting the scanner and retrieving all stored codes and freeze frame data. Remember to note this information for future reference and then clear all stored codes.
Use the DVOM and follow the manufacturer’s recommendations to test the DPF pressure sensor. Refer to the service manual for specific instructions. Any sensor that does not meet the manufacturer’s resistance specifications should be replaced.
The DPF pressure sensor supply tubes should be checked for obstructions and/or damage if the sensor checks out. Replace any burned, cracked, or collapsed tubes (high-temperature silicone tubes are recommended).
If the sensor supply lines are intact and the sensor is operational, you can begin testing the system circuits. To avoid damaging the PCM, disconnect all related controllers before testing resistance and/or continuity with the DVOM.
Additional Diagnostic Notes:
- Check the DPF regeneration fluid before attempting to diagnose this code
- Clogged sensor ports and blocked sensor tubes are common when this code is stored
- DPF pressure sensor tubes that have melted or been cut may need to be rerouted after replacement