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DTC codes / P05xx · Vehicle speed, idle control and auxiliary inputs / P05DC
P05DC indicates that the powertrain control module (PCM) has detected an out-of-range or performance fault in the electrical circuit for brake pedal position sensor B, which is often the redundant or secondary sensor in a dual-sensor brake pedal assembly. The PCM compares the signal from sensor B against expected values and the signal from sensor A, and it sets this code when the voltage or correlation falls outside the programmed limits.
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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