OBD Guide
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P05FA

Stop-Start Status Signal Circuit Low

P05FA is an OBD-II diagnostic trouble code meaning: Stop-Start Status Signal Circuit Low. Common causes: status signal line short to ground, open power supply circuit for status signal. Estimated repair cost: $22–133.

Severity
✅ Low
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$22–133 (est.)

Symptoms

  • The start-stop system is permanently disabled
  • The start-stop system indicator is on
  • Check Engine Light Is On
  • In some cases, associated CAN bus errors

Causes

  • Status signal line short to ground
  • Open power supply circuit for status signal
  • Malfunction of the start-stop system control unit
  • Faulty sensor supplying data to the system
  • Damage to connector or wiring

How to Fix

  1. Read codes, check all errors in the start-stop and CAN systems
  2. Check the voltage on the status signal line with the ignition on
  3. Check the signal wire for short circuit to ground (resistance of wire to ground)
  4. Inspect the connectors of the start-stop system control unit
  5. Check the correct operation of the connected units (battery, automatic transmission)
  6. Diagnose the start-stop system control unit

Related codes

P05F9P05FBP0A7F

Error P05FA by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P05FA code mean?

P05FA is an OBD-II diagnostic trouble code that indicates: Stop-Start Status Signal Circuit Low

What causes a P05FA error code?

The most common causes of P05FA include: Status signal line short to ground; Open power supply circuit for status signal; Malfunction of the start-stop system control unit; Faulty sensor supplying data to the system.

How do I fix a P05FA diagnostic trouble code?

To fix P05FA: Read codes, check all errors in the start-stop and CAN systems. Check the voltage on the status signal line with the ignition on. Check the signal wire for short circuit to ground (resistance of wire to ground). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P05FA?

Do not drive — repair immediately

How much does it cost to fix P05FA?

The estimated repair cost for P05FA is $22–133. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat