DTC Code P0B85 – What does this code mean?

<ul> <li><b>Engine Light ON</b>: The Engine Light or Service Engine Soon Warning Light illuminates, indicating an issue with the hybrid battery voltage sense circuit. This can be caused by intermittent or erratic signals from the voltage sense 'O' circuit.</li> <li><b>Erratic Hybrid System Performance</b>: The vehicle may experience inconsistent performance from the hybrid system due to the erratic voltage readings. This can lead to reduced fuel efficiency and potential drivability issues.</li> <li><b>Battery Management System Alerts</b>: The vehicle's battery management system may trigger alerts or warnings, indicating a problem with the voltage sensing circuit. This can be due to faulty wiring, poor connections, or a malfunctioning sensor.</li> </ul>

<ul><li>The battery smart unit may be malfunctioning, leading to intermittent or erratic voltage readings.</li><li>The high voltage (HV) battery assembly could be defective, causing inconsistent voltage signals.</li></ul>

<ul> <li><b>Initial Scan</b>: Use an OBD-II scanner to confirm the presence of DTC P0B85 and check for any additional related codes.</li> <li><b>Visual Inspection</b>: Inspect the hybrid battery and its connections for any visible damage, corrosion, or loose connections.</li> <li><b>Check Voltage Sense Circuit</b>: Measure the voltage at the hybrid battery voltage sense 'O' circuit using a multimeter to ensure it is within the manufacturer's specified range.</li> <li><b>Inspect Wiring and Connectors</b>: Examine the wiring and connectors associated with the voltage sense 'O' circuit for any signs of wear, damage, or disconnection.</li> <li><b>Test Hybrid Battery Control Module</b>: Verify the functionality of the hybrid battery control module by performing a diagnostic test using the manufacturer's recommended procedure.</li> <li><b>Check for Intermittent Issues</b>: Monitor the voltage sense 'O' circuit over time to identify any intermittent or erratic behavior that may not be immediately apparent.</li> <li><b>Clear Codes and Test Drive</b>: After addressing any identified issues, clear the DTC codes and perform a test drive to ensure the problem has been resolved and the code does not reappear.</li></ul>

<p>The DTC code P0B85 indicates an intermittent or erratic issue with the Hybrid Battery Voltage Sense 'O' Circuit. This is a <b>critical</b> issue as it affects the hybrid battery's ability to monitor and regulate voltage accurately.</p><ul><li>Immediate action is required to prevent potential battery damage or failure.</li><li>Delayed repair can lead to significant performance issues and costly repairs.</li></ul>