Symptoms
and severity
The storage conditions of this code can cause internal damage to the engine or fuel system and must be addressed
immediately.
Symptoms of a P2452 code may include:
- Excessive black smoke from the exhaust
- Decreased engine performance
- Higher engine temperatures
- Higher transmission temperatures
Causes
Causes
potential for setting this code are as follows:
- The diesel exhaust fluid tank is empty
- Incorrect diesel exhaust fluid
- Faulty DPF pressure sensor
- Clogged DPF pressure sensor tubes/pipes
- Open or shorted circuit(s) in the DPF pressure sensor A circuit
- Ineffective DPF regeneration
- Malfunctioning active DPF regeneration system
Diagnostic and Repair Procedures
A good starting point is always to check the technical service bulletins (TSB) for your specific vehicle. Your issue may be a known problem with a published fix from the manufacturer and can save you time and money during diagnosis.
A diagnostic scanner, a digital volt/ohmmeter, and the manufacturer’s service manual will be needed to diagnose a P2452 code. An infrared thermometer may also be useful.
I typically start my diagnosis with a visual inspection of the related wiring harnesses and connectors. I would pay close attention to wiring routed near hot exhaust components and sharp edges. Test the battery and battery terminals at this time and check the alternator output.
Next, I would connect the scanner and retrieve all stored codes and freeze frame data. I would write it down for future reference. This can be helpful if this code proves to be intermittent. Now, clear the codes and test drive the vehicle.
If the code resets immediately, check that the diesel exhaust fluid is present (if applicable) and is the correct type. The most common cause for storing this code is a lack of diesel exhaust fluid. Without the proper type of diesel exhaust fluid, the DPF will not regenerate effectively, causing a potential increase in exhaust pressure.
Consult the manufacturer’s service manual for how to test the DPF pressure sensor using the DVOM. If the sensor does not meet the manufacturer’s resistance specifications, it must be replaced. If the sensor appears good, check for obstructions and/or breaks in the DPF pressure sensor supply pipes. Clean or replace the pipes as needed. High-temperature silicone hoses should be used.
If the sensor is operational and the supply lines are intact, begin testing the system circuits. Disconnect all related control modules before testing resistance and/or continuity with the DVOM. Repair or replace any open or shorted circuits as needed.
Additional diagnostic notes:
- If the DPF pressure sensor hoses are melted or cracked, they may need to be rerouted after replacement
Consult the owner/service manual to see if your vehicle is equipped with an active DPF regeneration system or a passive system
Clogged sensor ports and clogged sensor tubes are common…