What does code P23A3 mean?

Q: What does code P23A3 mean?

Exhaust Heat Exchanger Bypass Valve B Control Circuit Low. P23A3 means the powertrain control module (PCM) has detected a low-voltage condition on the control circuit for the exhaust heat exchanger bypass valve B, which is used to route exhaust gas around the heat exchanger for faster engine warm-up and cabin heating. The PCM commands the valve to a position and monitors the circuit, and a low reading tells it the circuit is shorted to ground or the valve actuator is drawing too much current.

DTC codes / P23xx · Ignition system and misfire / P23A3

P23A3Exhaust Heat Exchanger Bypass Valve B Control Circuit Low

P23A3 means the powertrain control module (PCM) has detected a low-voltage condition on the control circuit for the exhaust heat exchanger bypass valve B, which is used to route exhaust gas around the heat exchanger for faster engine warm-up and cabin heating. The PCM commands the valve to a position and monitors the circuit, and a low reading tells it the circuit is shorted to ground or the valve actuator is drawing too much current.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.