P0B42

Hybrid/EV Battery Voltage Sense B Circuit Low

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–556 (est.)

Symptoms

Reduced engine power
Switching to emergency mode
Check Engine Light Illuminates
Reduced hybrid system efficiency
Battery warning on instrument panel

Causes

High voltage battery fault
Problems with voltage sensors
Open or short circuit in wiring
Contact corrosion in a high voltage system
Battery management module malfunction

How to Fix

High voltage battery diagnostics
Checking voltage sensors and their circuits
Inspection and testing of high voltage wiring
Checking connections and contacts in the system
Updating the battery management module software (if necessary)

Related codes

P0B41 P0B43 P0AFA