DTC codes / P04xx · Auxiliary emission controls / P045C
P045C indicates that the powertrain control module has detected a low-voltage condition on the control circuit for the EGR B solenoid, which is the secondary exhaust gas recirculation valve on systems that use two EGR valves. The computer expects to see a voltage within a specific range when commanding the valve, and a reading below that threshold for a set time triggers this code.
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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