DTC codes / P24xx · Auxiliary emission controls / P24AA
P24AA indicates that the engine control module (ECM) has detected an abnormally high voltage on the control circuit for the exhaust gas recirculation (EGR) cooler coolant pump. This pump circulates engine coolant through the EGR cooler to manage exhaust gas temperatures, and a high voltage reading typically points to an open circuit, a short to power, or a faulty pump control module.
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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