P05FA code meaning
Stop-Start Status Signal Circuit Low
What P05FA means
A discrete stop-start status line tells the engine module (or another module) whether stop-start is active, inhibited or has just stopped the engine. On most current cars this status travels over CAN instead, so a hard-wired line and these codes are rare; no manufacturer document available to us uses P05F9–P05FB. CARB names stop-start as its example of an 'emissions neutral' reaction: a module that simply disables stop-start when a fault appears may report it without the check engine light, which is what Ford does for its stop-start codes. P05FA means the status line stays below its lower limit – a short to ground or a missing pull-up supply. Stop-start is then disabled.
P05FA at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P05FA
- Stop-start does not work
- Stop-start indicator or message in the cluster
Common causes of P05FA
- Most likelyStatus line shorted to ground
- PossibleSending module pulls the line to ground permanently (faulty output)
- Less likelyMoisture or corrosion in the connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Stop start status lineBody control moduleEngine control module
What each part of P05FA means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 5 | Area: vehicle speed, idle control and auxiliary inputs. |
| FA | The exact fault in that area. |
What to do next
- Note P05FA 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 P05FA
What does P05FA mean?
P05FA means "Stop-Start Status Signal Circuit Low". A discrete stop-start status line tells the engine module (or another module) whether stop-start is active, inhibited or has just stopped the engine. It is a generic code, so it means the same on every make.
Is it safe to drive with P05FA?
P05FA does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P05FA fail an emissions test?
P05FA is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P05FA to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will P05FA clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.