P1550 Battery Current Sensor Circuit Range/Performance (Hybrid)
What does P1550 mean on a Toyota?
P1550. Battery Current Sensor Circuit Range/Performance (Hybrid). This Toyota-enhanced code applies to Prius, Camry Hybrid, Highlander Hybrid.
Common causes of P1550
- Drifting battery current sensor
- Corroded current sensor connections
- Aging 12V auxiliary battery skewing readings
- Wiring fault
- Hybrid control module fault
How to fix P1550
- Load-test the 12V auxiliary battery first
- Compare current readings to actual draw
- Inspect sensor connections
- Check wiring integrity
- Replace the sensor if readings drift
Sources and review
- Last updated 2026-09-06.