DTC codes / P23xx · Ignition system and misfire / P2354
P2354 indicates that the powertrain control module has detected an abnormally low voltage signal from the cylinder 10 pressure sensor circuit, which is used to monitor combustion pressure for that specific cylinder. The computer expects the sensor's output to stay within a calibrated range, and a low reading tells it that the signal wire may be shorted to ground, the sensor may have failed, or the reference voltage is missing.
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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