P06A6Sensor Reference Voltage A Circuit Range/Performance
- 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. P06A6 is the range/performance check of reference circuit A: the voltage is outside a narrow window without being split into low and high. Ford uses it: its 2012 and 2020–23 petrol tables flag below 4.7 V or above 5.2 V for 0.5 s (Bosch modules), and the 2023 diesel below 4.7 V or above 5.3 V for 5 s, where supply 1 feeds the rail pressure and crankshaft sensors. In the Saab 9-4X the fuel pump control module uses it for its fuel pressure sensor supply. Expect fuel pressure or crankshaft codes and reduced power; Ford's low/high codes for circuit A are P0642/P0643.
- What you may notice
- Check engine light
- Fuel pressure or crankshaft sensor codes as well
- Reduced power or 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.