OBD-II code · Powertrain (generic)
P06B3 Sensor Power Supply B Circuit Open
Sensor Power Supply B Circuit Open: the circuit is open. Sensors fed from this rail lose their supply and read invalid.
Is it safe to drive with P06B3?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen in supply rail
- Less likelyPin pushed back out of connector body
- Less likelyCracked solder joint inside the module or sensor
Symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- Parts involved
- Sensor Power Supply B
Related codes
- P06B0Sensor Power Supply A Circuit Open
- P06E6Sensor Power Supply C Circuit Open
- P06B1Sensor Power Supply A Circuit Low
- P06B2Sensor Power Supply A Circuit High
- P06B4Sensor Power Supply B Circuit Low
- P06B5Sensor Power Supply B Circuit High
- P06B6Internal Control Module Knock Combustion Vibration Sensor Processor 1 Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.