Hybrid Battery Voltage Sense Circuit Low
The P0B42 code indicates that the hybrid battery voltage sense circuit is reading lower than expected. This circuit monitors the voltage of the hybrid battery pack. A low reading can be caused by a faulty voltage sensor, damaged wiring, or a weak battery cell. This issue can affect the hybrid system's performance and may lead to reduced fuel economy or loss of hybrid functionality.
01. Most Common Causes
- Faulty hybrid battery voltage sensor
- Damaged or corroded wiring/connectors in the sense circuit
- Weak or failing hybrid battery cells
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Hybrid system warning light on
- Possible loss of hybrid assist
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to read the code and check for related codes.
Step 2: Inspect the hybrid battery voltage sensor and its wiring for damage or corrosion.
Step 3: Test the voltage sensor output with a multimeter and compare to specifications.
Step 4: Check the hybrid battery pack for weak cells using a battery tester.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it may cause further damage to the hybrid battery or system. Have it diagnosed promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and sensor replacement, but battery repairs can be more expensive.