P06A3

Sensor Reference Voltage D Circuit/Open

Q: Is it safe to drive with P06A3?

Not ideally — because multiple sensors share this reference, the engine can run poorly or derate. Have it diagnosed promptly.

Q: Can I just clear P06A3?

It returns until the open in the reference circuit is repaired. A scan tool helps identify which sensors lost their reference.

Sensor reference voltage Generic OBD-II High

What it means

P06A3 means the ECM has detected an open in its "D" 5-volt sensor reference circuit. Many sensors share this regulated reference, so when it opens those sensors lose their supply, report wrong values, and the engine can run poorly or drop into limp mode. The fault usually traces to broken reference wiring, a bad connector, or the ECM, rather than to the engine itself.

High

Can I keep driving? It can run rough or drop into limp mode, because several sensors share this 5-volt reference — get it diagnosed before relying on the vehicle.

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
Reduced power or limp mode
Several sensor codes stored at once (they share the same 5-volt reference)
Rough running, hesitation, or erratic gauges

Common causes

Most likely first

Open in the 5-volt reference D circuit wiringLikely
Corroded or disconnected connector on the reference circuitCommon
A sensor on the circuit shorted and disabling the referenceCommon
Faulty ECMLess often

How to diagnose & fix

Work through it in order

Scan and note every code present — the sensors sharing reference D help pinpoint the affected circuit.
Identify the sensors fed by the 5-volt reference D circuit for this vehicle and inspect their shared wiring and connectors for an open or corrosion.
Unplug those sensors one at a time to check whether a shorted sensor is pulling the reference down.
Repair the open circuit or connector; if the reference stays absent with good wiring, the ECM is at fault.

FAQ

Quick answers

Is it safe to drive with P06A3?+

Not ideally — because multiple sensors share this reference, the engine can run poorly or derate. Have it diagnosed promptly.

Can I just clear P06A3?+

It returns until the open in the reference circuit is repaired. A scan tool helps identify which sensors lost their reference.

Read & clear P06A3 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