Hybrid Battery Voltage Sense Circuit Intermittent/Erratic
The P0B44 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, reduce fuel efficiency, or trigger warning lights. The issue may stem from loose connections, damaged wiring, or a failing battery voltage sensor.
01. Most Common Causes
- Loose or corroded battery voltage sense wire connections
- Damaged wiring or connectors in the sense circuit
- Faulty hybrid battery voltage sensor
- Intermittent short or open in the circuit
02. Symptoms You Will Notice
- Check hybrid system warning light illuminated
- Reduced fuel economy or hybrid system performance
- Intermittent loss of electric power assist
- Battery voltage readings erratic on scan tool
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve freeze frame data and confirm the code is intermittent.
Step 2: Visually inspect the hybrid battery voltage sense wiring and connectors for damage, corrosion, or looseness.
Step 3: Perform a wiggle test on the wiring harness while monitoring voltage readings to isolate the intermittent fault.
Step 4: Check the hybrid battery voltage sensor resistance and compare to manufacturer specifications.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause unpredictable hybrid system behavior, potential loss of power, or further damage to the battery system.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair of wiring or connector issues. Sensor replacement may cost more.