P06B1

Sensor Power Supply A Circuit Low

Q: Is it safe to drive with P06B1?

Not for long — the supply feeds multiple sensors, so the engine can run poorly or drop into limp mode. Have it diagnosed before extended driving.

Q: Can I just clear P06B1?

It returns quickly because the supply circuit is still faulty. Clearing won't restore the sensors that depend on it.

Sensor power supply (ECM) Generic OBD-II High

What it means

P06B1 means the ECM detected low voltage on its "A" sensor power-supply circuit — the regulated feed that powers a group of engine sensors. When that supply sags, the sensors on it read wrong together, which can make the engine run poorly, drop into limp mode, or set several related codes at once.

High

Can I keep driving? Drive with caution — a low sensor supply can affect several sensors at once, causing poor running or limp mode; get it diagnosed promptly.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on, often with several sensor codes set at once
Reduced power or limp mode
Rough idle, hesitation, or surging
Possible stalling

Common causes

Most likely first

Short to ground, or an overload, on the sensor power-supply A circuitLikely
A shorted sensor pulling the shared supply voltage downCommon
Damaged wiring or a corroded/loose connector on the supply circuitCommon
Faulty ECM/PCM sensor-supply outputLess often

How to diagnose & fix

Work through it in order

Scan for all stored codes — the sensors sharing supply A help pinpoint the circuit.
Inspect the supply wiring and connectors for shorts to ground and corrosion.
With the key on, measure the supply voltage at the affected sensor connectors and compare to spec.
Unplug sensors on that circuit one at a time to find one shorting the supply down.
Only after wiring and sensors check out, consider a faulty ECM/PCM. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P06B1?+

Not for long — the supply feeds multiple sensors, so the engine can run poorly or drop into limp mode. Have it diagnosed before extended driving.

Can I just clear P06B1?+

It returns quickly because the supply circuit is still faulty. Clearing won't restore the sensors that depend on it.

Read & clear P06B1 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX