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DTC codes / P28xx · Transmission / P28A6
P28A6 indicates that the engine control module (ECM) has detected an abnormally low voltage on the ion current sense circuit for cylinder 6, which is used to monitor combustion quality. The ECM expects a specific voltage range during the ion current measurement window, and a low reading suggests a short to ground, a faulty sensor, or a wiring issue.
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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