What does code P2AC2 mean?

Q: What does code P2AC2 mean?

Intake Air O2 Sensor Reference Voltage Circuit High Bank 1. P2AC2 indicates that the powertrain control module detected an abnormally high voltage on the reference voltage circuit for the intake air oxygen sensor on bank 1. The sensor's signal circuit is reading above the expected range, which the computer interprets as a circuit fault rather than a valid oxygen reading.

DTC codes / P2Axx · Hybrid propulsion / P2AC2

P2AC2Intake Air O2 Sensor Reference Voltage Circuit High Bank 1

P2AC2 indicates that the powertrain control module detected an abnormally high voltage on the reference voltage circuit for the intake air oxygen sensor on bank 1. The sensor's signal circuit is reading above the expected range, which the computer interprets as a circuit fault rather than a valid oxygen reading.

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.