Hybrid and EV

B00F6 — High Voltage Condition Detected

Severity: medium Drive with care, to a shop

What B00F6 means

B00F6 is a body-group (B) code whose exact definition is set by the manufacturer, and it is most often seen on hybrids. The control unit saw excessive voltage in the high-voltage circuit or a sensor reading that makes no sense. Normally the battery management system constantly compares pack and module voltages against allowed limits and restricts the system when they are exceeded. The precise meaning varies by make and model, so confirm it in service information.

Symptoms

  • Hybrid system warning or check engine light on
  • Worse fuel economy and less efficient hybrid operation
  • Hesitation or weak electric motor assist
  • Car will not enter READY mode, or shows warnings during mode changes

Possible causes

  1. Faulty battery management or control module
  2. Bad high-voltage sensor or damaged wiring harness
  3. Hybrid battery overvoltage or cell imbalance
  4. Corroded or loose connectors in the circuit
  5. DC-DC converter or 12V charging problem

How to diagnose

  1. Read all codes and freeze-frame data and note any other hybrid system codes
  2. Test the 12V battery voltage and inspect its terminals
  3. Inspect the sensor harness and connectors for damage, moisture and corrosion
  4. Compare pack and individual module voltages in scan tool data
  5. Check DC-DC converter operation
  6. Look for software updates for the battery control module
  7. Leave any high-voltage measurements to a trained, certified technician with proper protection

Common fixes

  • Repair or replace the voltage sensor or damaged harness
  • Clean and restore connector contacts
  • Reprogram or replace the battery management module
  • Service or replace hybrid battery modules if imbalanced
  • Replace a failed DC-DC converter

Questions and answers

What does B00F6 mean?

It is a manufacturer-defined code tied to a high voltage condition in a hybrid's high-voltage system or an implausible sensor signal. Check the exact definition in service information for your make.

Can I drive with B00F6?

A short trip to a shop may be fine if the car runs normally. If you lose power, see red warnings or cannot get into READY mode, stop and arrange a tow.

Can I test the hybrid battery myself?

No, it is dangerous. You can read codes and check the 12V battery, but high-voltage work should be done by a trained technician.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.