What it means
The sensor power supply A circuit is open, interrupting power to components supplied by that circuit. Which sensors are affected depends on the vehicle.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Sensor power supply A is a module-managed supply rail that powers a group of sensors; which sensors use it depends on the vehicle. P06B0 sets when the module detects an open in supply A, interrupting power to that group and potentially causing several related faults.
Common causes
Most likely first.
- Open in supply rail
- Pin pushed back out of connector body
- Cracked 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
How to diagnose it
- Scan all modules and record freeze-frame data and companion sensor codes to identify which components may share supply A.
- Check live data and symptoms for those sensors, noting which readings are missing or implausible together.
- Inspect the supply A wiring and connectors at the module and affected sensors for loose plugs, pushed-back pins, corrosion, or harness damage.
- Use the wiring diagram to check continuity through supply A and test for an open between the module and affected branches.
- If the external rail is intact, follow the manufacturer's procedure to check module output and any internal connection or solder fault.
Common fixes
- Reconnect a loose plug or seat a pushed-back terminal correctly.
- Repair a broken supply A wire or damaged connector.
- Repair a failed internal connection in a serviceable module or sensor assembly as specified by the manufacturer.
- Replace a module or component only if testing confirms its supply output or internal connection has failed.
Can I keep driving?
Avoid driving if the engine runs poorly, enters reduced-power operation, or will not start, since loss of sensor power can affect engine control and trigger related faults. If it runs normally, limit driving to what is needed for diagnosis and stop if power or drivability changes.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.