P06B2
Sensor Power Supply A Circuit High
Sensor power supply / ECM
Generic OBD-II
High
What it means
P06B2 means the A sensor power supply — a reference voltage the ECM sends to several sensors — is reading too high. Because multiple sensors rely on this supply, the fault can set several sensor codes at once and make the engine run poorly, drop into limp mode, or start hard until the wiring or ECM problem is corrected.
High
Can I keep driving? Be cautious — the sensor power supply feeds multiple sensors, so a fault can cause poor running, limp mode, or hard starting. Have it diagnosed before long trips.
Common symptoms
What you'll notice
- Check-engine light on, often with multiple sensor codes
- Rough running, hesitation, or stalling
- Reduced power or limp mode
- Hard starting in some cases
Common causes
Most likely first
- Reference/power supply wiring shorted to voltage or openLikely
- Corroded or loose connector on the supply circuitCommon
- A sensor faulting the shared power supplyCommon
- Faulty ECMLess often
How to diagnose & fix
Work through it in order
- Scan and list the sensors fed by power supply A.
- Inspect the supply wiring for shorts to power, opens, and corrosion.
- Disconnect the sensors on that supply one at a time to isolate a faulty sensor.
- Repair the wiring or replace the offending sensor.
- If the reading stays high with the sensors unplugged, suspect the ECM.
FAQ
Quick answers
Is it safe to drive with P06B2?+
Not ideal — many sensors share this supply, so the engine may run rough or enter limp mode. Diagnose it before driving far.
Can I just clear P06B2?+
It returns while the supply reads high; the wiring or ECM issue must be repaired first.
Related codes
Often seen with P06B2
Read & clear P06B2 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX