What does code P2AC1 mean?

Q: What does code P2AC1 mean?

Intake Air O2 Sensor Reference Voltage Circuit Low Bank 1. P2AC1 indicates that the engine control module (ECM) has detected a low voltage condition on the reference voltage circuit for the intake air oxygen (O2) sensor on bank 1. This circuit provides a stable voltage to the sensor's internal heater or signal amplifier, and a low reading means the ECM sees less voltage than expected, which can affect the sensor's ability to report accurate oxygen content in the intake air.

DTC codes / P2Axx · Hybrid propulsion / P2AC1

P2AC1Intake Air O2 Sensor Reference Voltage Circuit Low Bank 1

P2AC1 indicates that the engine control module (ECM) has detected a low voltage condition on the reference voltage circuit for the intake air oxygen (O2) sensor on bank 1. This circuit provides a stable voltage to the sensor's internal heater or signal amplifier, and a low reading means the ECM sees less voltage than expected, which can affect the sensor's ability to report accurate oxygen content in the intake air.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaHybrid propulsion

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