P1391
Sistema
Powertrain (Diesel)
Escáner necesario
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 FOXWELL scanner to diagnose it.

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

Síntomas habituales

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

Causas típicas

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

¿Qué escáner necesita?

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

Use datos en vivo y freeze frame antes de cambiar piezas. Códigos ABS, SRS y U suelen requerir un escáner de todos los sistemas.

Consejos de diagnóstico

  • Registre el freeze frame cuando se active el código
  • Borre el código solo tras corregir la causa
  • Revise códigos pendientes relacionados
  • Verifique que la batería esté por encima de 12,4 V antes de sospechar sensores

Escáneres FOXWELL recomendados

Preguntas frecuentes

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.
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.