DTC codes / P23xx · Ignition system and misfire / P23A2
P23A2 is a generic OBD-II code indicating an open circuit in the control circuit for the exhaust heat exchanger bypass valve B. The engine control module (ECM) commands the valve to change position and detects no current flow or an unexpected voltage on the control wire, signaling a break in the circuit.
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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