Particulate Filter Restriction - Ash Accumulation Bank 1

Check these first

• High mileage ash loading the bank 1 particulate filter
• Engine oil or coolant entering the bank 1 exhaust
• Extended low load driving preventing regeneration
• A restricted bank 1 exhaust raising back pressure

What to do next

1. Read bank 1 DPF differential pressure and soot load on a scan tool
2. Check for oil or coolant consumption feeding ash
3. Inspect the bank 1 exhaust for restriction
4. Run a forced regeneration to see if ash clears
5. Replace or clean the bank 1 particulate filter if ash will not burn off
6. Clear the code and retest

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