What are the common causes of P24A1?

A failed DPF temperature sensor reading hot. A DPF temperature sensor circuit fault. A regeneration control that runs too long. A clogged DPF that concentrates the heat.

Read the DPF temperature and regeneration status on a scan tool. Test the DPF temperature sensor circuit for open and short faults. Check the DPF for a clog that concentrates heat. Verify the regeneration control stops at the target temperature. Replace the DPF temperature sensor if the circuit tests good. Clear the code and retest.

P24A1

Closed Loop Particulate Filter Regeneration Control At Limit - Temperature Too High

System: Auxiliary emission controls (P code)
Lamp: Check Engine Light
Category: Powertrain - Auxiliary Emissions Controls

What it means

P24A1 means Closed Loop Particulate Filter Regeneration Control At Limit - Temperature Too High.

Check these first

A failed DPF temperature sensor reading hot
A DPF temperature sensor circuit fault
A regeneration control that runs too long
A clogged DPF that concentrates the heat

What to do next

Read the DPF temperature and regeneration status on a scan tool
Test the DPF temperature sensor circuit for open and short faults
Check the DPF for a clog that concentrates heat
Verify the regeneration control stops at the target temperature
Replace the DPF temperature sensor if the circuit tests good
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.