What it means
The DPF substrate on bank 2 has been detected as cracked, melted, or removed. Differential pressure across the filter is too low for the measured exhaust flow — the soot trap no longer works.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The bank 2 diesel particulate filter traps soot in its substrate, and the control module checks whether exhaust flow produces the expected pressure difference across that filter. This code sets when bank 2 appears to have abnormally low restriction, which can indicate a damaged, melted, or missing substrate.
Common causes
Most likely first.
- Particulate-filter substrate cracked or melted
- Particulate-filter substrate removed or missing
- Internal filter damage causing abnormally low restriction
Symptoms
- Check engine light or DPF warning light on
- Power loss / limp mode
- Increased fuel consumption
- Failed forced regeneration attempts
How to diagnose it
- Review freeze-frame data and bank 2 DPF live readings, especially differential pressure in relation to exhaust flow.
- Inspect the bank 2 filter and exhaust joints for physical damage, signs of removal, or soot deposits downstream of the filter.
- Check bank 2 differential-pressure hoses and wiring for leaks, blockage, disconnection, or damage that could create a false low-pressure reading.
- Compare bank 2 pressure readings under the manufacturer's test conditions with the manufacturer's specification, and note any related sensor or temperature codes.
- If the pressure circuit checks out, inspect the bank 2 substrate for cracking, melting, or missing material before attempting regeneration.
Common fixes
- Reconnect or replace damaged bank 2 differential-pressure hoses.
- Repair the pressure-sensor wiring or replace a sensor that fails testing.
- Replace the damaged or missing bank 2 particulate-filter substrate or assembly.
- Repair the underlying cause of excessive exhaust heat before installing a replacement filter.
Can I keep driving?
Keep driving to a minimum and avoid heavy loads because the bank 2 filter may not control soot emissions, even if limp mode is not active. Further driving can trigger warnings or power limits, and forced regeneration will not repair a missing or damaged substrate.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.