P1551 Battery Current Sensor Circuit Low Input (Hybrid)

Category: Powertrain - Computer and Auxiliary Controls
Severity: Check Engine Light
Applies to: Prius, Camry Hybrid

What does P1551 mean on a Toyota?

P1551 — Battery Current Sensor Circuit Low Input (Hybrid). This Toyota-enhanced code applies to Prius, Camry Hybrid.

Common causes of P1551

Shorted current sensor
Signal wire shorted to ground
Failed sensor stuck low
Corroded connector
Module fault

How to fix P1551

Inspect wiring for shorts
Disconnect and watch for a change
Test sensor output
Check the 12V battery health
Replace the sensor if stuck low