What does code P2AC5 mean?

Q: What does code P2AC5 mean?

Intake Air O2 Sensor Reference Voltage Circuit Low Bank 2. P2AC5 indicates that the powertrain control module has detected a low voltage condition on the reference voltage circuit for the intake air oxygen sensor on bank 2. This sensor, often a wideband air-fuel ratio sensor, relies on a stable reference voltage from the computer to accurately measure oxygen content in the intake air stream, and a low reference signal can disrupt fuel control and emissions monitoring.

DTC codes / P2Axx · Hybrid propulsion / P2AC5

P2AC5Intake Air O2 Sensor Reference Voltage Circuit Low Bank 2

P2AC5 indicates that the powertrain control module has detected a low voltage condition on the reference voltage circuit for the intake air oxygen sensor on bank 2. This sensor, often a wideband air-fuel ratio sensor, relies on a stable reference voltage from the computer to accurately measure oxygen content in the intake air stream, and a low reference signal can disrupt fuel control and emissions monitoring.

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.