OBD-II code · Powertrain (generic, extended)
P2A43 Alternative Fuel Tank B Pressure Sensor Circuit Low
Voltage on the pressure sensor signal line of alternative fuel tank B is below the expected window. Wire shorted to ground or sensor short.
Is it safe to drive with P2A43?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySignal wire shorted to ground
- PossibleInternal sensor short
- Less likelyConnector pins corroded - high contact resistance
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Likely to fail
- Parts involved
- Alt Fuel Tank B Pressure Sensor, Wiring Harness, Afcm
Related codes
- P01A0Alternative Fuel Tank A Pressure Sensor Circuit Low
- P2A48Alternative Fuel Tank C Pressure Sensor Circuit Low
- P2A40Alternative Fuel System - Injector Leakage to Rail Detected
- P2A41Alternative Fuel Tank B Pressure Sensor Circuit
- P2A42Alternative Fuel Tank B Pressure Sensor Range/Performance
- P2A44Alternative Fuel Tank B Pressure Sensor Circuit High
- P2A45Alternative Fuel Tank B Pressure Sensor Circuit Intermittent/Erratic
- P2A46Alternative Fuel Tank C Pressure Sensor Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.