P06A3Sensor Reference Voltage D Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- The engine module feeds sensors from several regulated 5 V reference circuits; a short at one sensor pulls the whole circuit down, so all its sensors report at once – unplug them one by one to find the culprit. On GM engines (2016–2025) circuit D feeds pedal sensor 1 and both throttle position sensors, on the Saab 9-4X the throttle and pedal sensor 1 – a fault therefore usually means electronic throttle limp mode. P06A3 is the general code for circuit D. GM's petrol engines (2016–2025) and 2018 diesels use it as the only code for this circuit (4.875–5.125 V, lamp in the first trip); the 2014 6.6 L LML used 4.6 V or less for 1 s with two trips. Saab's 9-3 (2012) also reports it.
- What you may notice
- Check engine light
- Several sensor codes at once (pedal, throttle, pressure)
- Electronic throttle limp mode, reduced power
- Possibly starting problems
- Likely causes
- LikelyShort in the wire or sensor of a connected sensor
- PossibleChafing or water in harness or connector
- PossibleA connected sensor faulty internally
- RareModule internal voltage regulator
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.