DTC codes / P23xx · Ignition system and misfire / P236A
P236A indicates that the powertrain control module (PCM) has detected an intermittent or erratic signal from the cylinder 12 pressure sensor circuit, which is used on engines with cylinder pressure sensing for precise combustion monitoring. The PCM compares the sensor's signal against expected values and flags the code when the voltage or signal pattern jumps, drops out, or behaves unpredictably rather than failing completely.
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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