P06B5
Sensor Power Supply B Circuit High
Sensor reference voltage / ECM
Generic OBD-II
High
What it means
P06B5 means the engine computer's "B" sensor power-supply circuit is reading high. This supply feeds a group of sensors, so when it's out of range those sensors can return faulty readings — the engine may run poorly, store other sensor codes, or drop into a reduced-power mode.
High
Can I keep driving? Depends — this supply feeds a group of sensors, so the engine may run poorly or drop into limp mode; drive gently and get it diagnosed.
Common symptoms
What you'll notice
- Check-engine light on, often with several sensor codes at once
- Poor running, hesitation, or reduced-power limp mode
- Erratic gauge or sensor readings
- Stalling in some cases
Common causes
Most likely first
- Short to voltage on the sensor power-supply B circuit wiringLikely
- A shorted sensor pulling the shared supply highCommon
- Chafed harness contacting a power wireCommon
- Failed ECM/PCM sensor supplyLess often
How to diagnose & fix
Work through it in order
- Scan for all codes; note which sensors share power-supply B.
- Inspect the supply wiring for a short to battery or ignition voltage.
- Unplug sensors on that circuit one at a time to find a shorted sensor.
- If wiring and sensors are good, suspect the module's sensor supply. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P06B5?+
Not ideal — a faulty sensor supply can make the engine run rough or drop into limp mode unexpectedly. Drive gently and get it diagnosed soon.
Can I just clear P06B5?+
It returns while the short is present; clearing won't restore the sensors' supply voltage.
Related codes
Often seen with P06B5
Read & clear P06B5 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