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DTC codes / P24xx · Auxiliary emission controls / P24D4
P24D4 indicates that the engine control module (ECM) has detected an abnormal condition in the feedback circuit for the EGR cooler coolant pump, which is responsible for circulating coolant through the exhaust gas recirculation (EGR) cooler. The ECM monitors the pump's electrical feedback signal and sets this code when the signal is out of expected range, indicating a possible open circuit, short, or pump malfunction.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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