OBD-II
P2091
B Bank 2 Sensor High Aftertreatment System Performance
What it means
The Engine Control Module (ECM) has detected a high voltage condition in the Bank 2 Post-Catalyst Oil Temperature Sensor or reductant-related control circuit. This code typically points to an electrical fault in the secondary emission monitoring bank or its associated feedback loop.
Sign in to view symptoms, probable causes, diagnostic steps, severity, and related codes