P2A45
Alternative Fuel Tank B Pressure Sensor Circuit Intermittent/Erratic
The pressure sensor signal of alternative fuel tank B drops out or jumps intermittently. Loose connector or noisy ground.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Sensor connector not seatedCommon
- Noisy ground referencePossible
- Connector with intermittent contact under vibrationLess likely
Parts involved
- Alt Fuel Tank B Pressure Sensor
- Wiring Harness
- Afcm
P2A45 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.