What does P2003 Diesel Particulate Filter Efficiency Below Threshold Bank 2 mean?
The P2003 OBD code stands for "Diesel Particulate Filter Efficiency Below Threshold Bank 2".
This code refers to a malfunction in the diesel particulate filter (DPF), which is an emissions control device installed on 2007 and later diesel vehicles.
The DPF's job is to eliminate the soot emitted from the exhaust.
When the vehicle's computer senses a discrepancy in the pressure limits of the DPF for two consecutive running cycles, it will trigger the P2003 code.
This code indicates that the DPF is not functioning as it should.
However, it's important to note that the DPF has a regenerative capability to burn off the soot buildup, which can fix the issue and clear the code on its own.
If the code persists, it is recommended to have the vehicle checked by a mechanic who can use a diagnostic computer to identify the exact cause of the problem.
P2003 Symptoms
- A drop in fuel economy occurs as the engine management system attempts to increase the temperature of the exhaust to burn off the excess soot in the DPF
- The check engine light will be on with the code u0027P2003.u0027 The light may stay on or light intermittently as the DPF regenerates
- The engine will be sluggish on acceleration
- The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature
- If the DPF is not cleared the ECU will revert to the u0027Limp Home Modeu0027 until the situation is corrected
Possible P2003 Causes
- Too much slow speed operation
- An air leak forward of the DPF
- Defective ECU strategies or components
- Fuel with a large percentage of sulfur
- Some aftermarket accessories and performance modifications
- Dirty air cleaner element
- Damaged DPF
Troubleshooting P2003 error code
- Inspect the DPF on Bank #2 for loose connections on the engine side where it mounts to the exhaust
- Inspect the differential pressure sensors located on the front and rear of the DPF (bank 2)
- Look for burnt wires or loose or corroded connectors
- Pull the connectors apart and look for bent or corroded pins
- Make sure the sensor wires are not resting on the DPF
- Drive the truck for approximately 30 minutes at highway speeds in order to raise the exhaust temperature enough to regenerate the DPF
- If the problem still persists after driving at highway speeds, take it to a shop and have them place it on a diagnostic computer
- Reprogram the computer to prevent the regenerating process or replace the DPF with a straight pipe