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P1391
System
Powertrain (Diesel)
Wymagany skaner
Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

Glow Plug Circuit Low (Cylinder 1) — Diesel

Understand P1391, common causes, and the right TOPDON scanner to diagnose it.

Glow plug circuit low on cylinder 1 — diesel cold-start aid.

Typowe objawy

  • Hard cold start
  • White smoke on cold start
  • Check engine light

Typowe przyczyny

  • Failed glow plug
  • Short in glow plug circuit
  • Glow plug module fault

Jakiego skanera potrzebujesz?

Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

Użyj danych na żywo i freeze frame przed wymianą części. Kody ABS, SRS i U zwykle wymagają skanera full-system.

Wskazówki diagnostyczne

  • Zapisz freeze frame, gdy pojawi się kod
  • Kasuj kod dopiero po usunięciu przyczyny
  • Sprawdź powiązane kody pending
  • Sprawdź, czy napięcie akumulatora jest powyżej 12,4 V przed podejrzeniem czujników

Polecane skanery TOPDON

Często zadawane pytania

What does P1391 mean?
P1391 indicates glow plug circuit low (cylinder 1) — diesel. Glow plug circuit low on cylinder 1 — diesel cold-start aid.
Can I diagnose P1391 with a basic code reader?
P1391 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Which TOPDON scanner do I need for P1391?
Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test) See recommended tools on this page.
Is it safe to drive with P1391?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.