SCR NOx Catalyst Outlet Temperature Too High During Particulate Filter Regeneration

Check these first

• A restricted exhaust raising the outlet temperature
• A failing catalytic converter or DPF
• A failing NOx or temperature sensor at the SCR outlet
• Excess soot buildup during regeneration
• A failing reductant injector feeding the SCR

What to do next

1. Read SCR outlet and exhaust temperature data with a scan tool
2. Inspect the exhaust for restrictions or a clogged DPF
3. Check the NOx and temperature sensors for damage
4. Check the reductant injector operation
5. Clean or replace restricted exhaust components if faulty
6. Clear the code and retest

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