P2453 Diesel Particulate Filter Pressure Sensor A Circuit Range/Performance
Symptoms and Severity
This code should be considered urgent, as it indicates conditions that could lead to internal engine or fuel system damage. Symptoms of a P2453 code may include:
- Decreased engine performance
- Excessive black smoke from exhaust
- Increased engine temperatures
- Higher than normal transmission temperatures
The potential causes for setting this code are as follows:
- Clogged DPF pressure sensor tubes/pipes
- Faulty DPF pressure sensor
- Diesel exhaust fluid tank may be empty
- Poor quality diesel exhaust fluid
- Open or shorted circuit(s) in DPF pressure sensor A circuit
- Ineffective DPF regeneration
- Active DPF regeneration system inoperative
Diagnostic and Repair Procedures
A good starting point is always to check technical service bulletins (TSB) for your specific vehicle. Your issue may be a known problem with a known fix published by the manufacturer and can save you time and money during diagnosis.
A manufacturer service manual, diagnostic scanner, and digital volt/ohmmeter will be essential for diagnosing a P2453 code. An infrared thermometer may also be helpful.
I would begin my diagnosis with a visual inspection of related wiring harnesses and connectors; paying close attention to wiring routed near hot exhaust components and/or sharp edges. Test alternator output, check battery and battery terminal ends at this time.
I would continue by connecting the scanner and retrieving all stored codes and freeze frame data. Be sure to note this information for future reference. Clear the codes and test drive the vehicle.
Verify that diesel exhaust fluid is present (if applicable) and is the correct type, especially if the code resets immediately. Lack of diesel exhaust fluid is probably the most common cause for storing this code. The DPF will not regenerate effectively without the proper type of diesel exhaust fluid. Poor DPF regeneration will result in increased exhaust pressure.
Test the Sensor
Using the DVOM, test the DPF pressure sensor. Consult the manufacturer’s service manual for instructions. The sensor should be replaced if it doesn’t meet manufacturer resistance specifications.
Check for obstructions and/or breaks in the DPF pressure sensor supply pipes, if the sensor checks out. Clean or replace pipes as needed (high-temperature silicone pipes should be used).
If the supply lines are intact and the sensor is operational, begin testing the system circuits. Disconnect all associated controllers before testing resistance and/or continuity with the DVOM. Repair or replace open or shorted circuits as necessary.
Additional Diagnostic Notes:
Clogged sensor ports and clogged sensor tubes are common
Consult owner/service manual to determine if your vehicle is equipped with an active DPF regeneration system or a passive system
If DPF pressure sensor hoses are melted or cracked, they may need to be rerouted after replacement