Code Definition

P24A8 — EGR Cooler Coolant Pump Performance / Stuck Off

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P24A8

P24A8 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P24A8 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P24A8 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

P24A8 is set when the engine control module commands the EGR cooler coolant pump to run but the resulting flow, current draw or temperature change shows the pump is not actually moving coolant. Modern diesel EGR systems use a small auxiliary electric coolant pump to circulate coolant through the EGR cooler, particularly at low engine speed and for a period after shutdown, so recirculated exhaust gas is cooled properly and the cooler itself does not overheat. When the module decides the pump is stuck off or performing below threshold it stores this code and commonly reduces or disables EGR oper...

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