P1A31 - Hybrid Battery 3 Circuit High Voltage

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Faulty Energy Storage Box (ESB) Battery
  • Faulty Battery Energy Control Module (BECM)
  • Battery Energy Control Module (BECM) harness is open or shorted
  • Battery Energy Control Module (BECM) circuit poor electrical connection

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1a31 Description

Battery voltage sensors allow the Energy Storage Control Module (ESCM) to monitor the voltage of the batteries in the Energy Storage Box (ESB). The batteries apply voltage to internal input resistors that are connected to the signal circuits of the battery voltage sensors. The module provides ground to the battery voltage sensors through the reference circuit. The ESCM monitors the voltage drop across the battery voltage sensors and uses the inputs for hybrid calculations. When the battery voltage is high, the resistances of the sensors are high and the voltage signals are high. When the battery voltage is low, the resistances of the sensors are low and the voltage signals are low.
OBDII Code P1a31 - Hybrid Battery 3 Circuit High Voltage - AutoCodes.com

P1A31 Information for specific makes

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P1A31 Comments

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