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
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