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DTC codes / P24xx · Auxiliary emission controls / P240C
P240C indicates that the powertrain control module has detected an abnormally high voltage on the control circuit for the evaporative emission system's leak detection pump heater. The heater is used to warm the pump during certain diagnostic tests, and a high voltage reading suggests an open circuit, a short to voltage, or a failed heater element within the pump assembly.
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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