P06B0
Sensor Power Supply A Circuit/Open
ECM sensor power supply
Generic OBD-II
High
What it means
P06B0 means the ECM has detected an open in sensor power supply circuit "A" — one of the shared 5-volt reference feeds that powers multiple engine sensors. Because several sensors depend on that supply, an open can set a cluster of sensor codes at once and make the engine run poorly or drop into limp mode until it's repaired.
High
Can I keep driving? Have it diagnosed promptly — losing the sensor reference supply can knock out several sensors at once and make the engine run poorly or drop into limp mode.
Common symptoms
What you'll notice
- Check-engine light on, often with several sensor codes at once
- Rough running, hesitation, or reduced power
- Engine may drop into limp/failsafe mode
- Erratic gauge or sensor readings
Common causes
Most likely first
- A shorted sensor dragging down the shared 5-volt reference circuitLikely
- Open or shorted wiring in the sensor power supply harnessCommon
- Corroded or loose connector on the reference circuitCommon
- Faulty ECM/PCMLess often
How to diagnose & fix
Work through it in order
- Scan for all stored codes — several sensors sharing this supply usually set codes together.
- Measure the 5-volt reference voltage at the affected sensors.
- Unplug sensors on that circuit one at a time to find a shorted sensor pulling the reference down.
- Inspect the harness and connectors for opens, shorts, and corrosion.
- If wiring and sensors check out, suspect the ECM. Repair, clear, and retest.
FAQ
Quick answers
Is it safe to drive with P06B0?+
Not recommended for long. Many sensors share this reference voltage, so losing it can make the engine run poorly or drop into limp mode. Get it diagnosed promptly.
Can I just clear P06B0?+
It returns as soon as the ECM sees the reference circuit fault again. The open, short, or faulty sensor has to be found and repaired first.
Related codes
Often seen with P06B0
Read & clear P06B0 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