P2003
PPowertrainDPF Efficiency Below Threshold (Bank 2)
What does this code mean?
Severity : HighP2003 indicates that diesel particulate filter (DPF) efficiency on bank 2 is below the expected threshold. It applies to V engines with one filter per cylinder bank. Using differential pressure, the ECU concludes that the filter is no longer trapping soot properly, or that the reading is distorted.
Symptoms
- Check engine or DPF warning light on.
- Black smoke from the exhaust.
- Possible limp mode with reduced power.
- Soot visible at the tailpipe.
Possible causes
- Cracked or damaged bank 2 DPF.
- Differential pressure sensor hoses disconnected or split.
- Faulty differential pressure sensor.
- Exhaust leak upstream of the filter.
- Excess engine smoke from injection or turbo faults.
Diagnosis and repair
- Check the bank 2 differential pressure sensor and hoses.
- Compare differential pressure readings for both banks in live data.
- Check for exhaust leaks and inspect the filter condition.
- Replace the sensor, hoses or DPF according to the diagnosis.
- Clear the code and road test.
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Code
P2003
Category
Powertrain
Prefix
P
Standard
OBD-II / SAE J2012