Hybrid Battery Voltage Sense Circuit Intermittent/Erratic
The P0B67 code indicates an intermittent or erratic signal from the hybrid battery voltage sense circuit. This circuit monitors the voltage of the high-voltage hybrid battery pack. An intermittent fault can cause the hybrid system to malfunction, potentially leading to reduced performance, warning lights, or unexpected shutdowns. The issue may stem from loose connections, corroded terminals, damaged wiring, or a failing battery voltage sensor.
1. Symptoms You Will Notice
- Check hybrid system warning light illuminated
- Reduced fuel economy or loss of hybrid assist
- Vehicle may enter limp mode or fail to start
- Intermittent loss of power or hesitation
2. Most Common Causes
- Loose or corroded battery voltage sense circuit connections
- Damaged or chafed wiring in the voltage sense circuit
- Faulty hybrid battery voltage sensor
- Intermittent short or open in the circuit
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all codes and freeze frame data.
Step 2: Visually inspect the hybrid battery voltage sense circuit connectors and wiring for damage, corrosion, or looseness.
Step 3: Perform a voltage drop test on the sense circuit to identify intermittent opens or high resistance.
Step 4: If wiring is intact, test the hybrid battery voltage sensor per manufacturer specifications.
Step 5: Clear the code and test drive to see if the code returns; if intermittent, wiggle test the harness while monitoring sensor data.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause sudden loss of hybrid power or unexpected shutdown, posing a safety risk.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on the root cause and labor rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.