P06A6 code meaning
Sensor Reference Voltage A Circuit Range/Performance
Powertrain system Generic code P06xx codes Check engine light
What P06A6 means
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 gasoline 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.
P06A6 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor1 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P06A6
- Check engine light
- Fuel pressure or crankshaft sensor codes as well
- Reduced power or starting problems
Common causes of P06A6
- Most likelyShort in the wire or sensor of a connected sensor
- PossibleChafing or water in harness or connector
- PossibleA connected sensor faulty internally
- Less likelyModule internal voltage regulator
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Sensor reference voltage circuitSensor wiringEngine control module
What each part of P06A6 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 6 | Area: computer (engine control module) and output circuits. |
| A6 | The exact fault in that area. |
What to do next
- Note P06A6 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P06A6
What does P06A6 mean?
P06A6 means "Sensor Reference Voltage A Circuit Range/Performance". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P06A6?
Drive gently and only to a workshop. With P06A6 the car can go into limp mode (reduced power) to protect itself.
Will P06A6 fail an emissions test?
Yes, it can. P06A6 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P06A6 to fix?
Difficulty: medium. A typical repair takes 1 to 3 hours of work. This is a job for a workshop.
Will P06A6 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.