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DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P25C8
P25C8 indicates that the powertrain control module (PCM) has detected an intermittent or erratic signal from the brake booster temperature sensor on circuit A. The computer expects a steady voltage or resistance value that changes predictably with temperature, but instead sees the signal jump, drop out, or behave in a way that does not match the expected pattern.
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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