Credov

P0671 fault code: what it means

P0671: Cylinder 1 glow plug circuit fault on a diesel.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

  1. failed cylinder 1 glow plug
  2. loose or corroded glow plug connector
  3. damaged wiring to the plug

P0671 by make

Audi

Cylinder 1 glow plug circuit open. Most often the glow plug itself has burnt out.

Usual causes: burnt-out glow plug; brittle or broken glow plug wiring; glow plug control module

BMW

Glow plug cylinder 1 circuit fault (same pattern for P0672-P0676 on other cylinders).

Usual causes: failed glow plug; glow plug control module; wiring

Isuzu

Cylinder 1 glow plug circuit.

Usual causes: failed glow plug cylinder 1; glow plug wiring; glow plug controller

Mazda

SkyActiv-D: glow plug No.1 circuit fault. Hard cold starts and smoke; glow plug is the usual fix.

Usual causes: glow plug No.1; glow plug connector or wiring; glow control module

Mercedes-Benz

Glow plug circuit fault, cylinder 1. Glow plugs on Mercedes diesels can seize and snap on removal, adding labour.

Usual causes: failed glow plug; wiring or connector fault; glow plug control module

Skoda

Cylinder 1 glow plug circuit open. Most often the glow plug itself has burnt out.

Usual causes: burnt-out glow plug; brittle or broken glow plug wiring; glow plug control module

Volkswagen

Cylinder 1 glow plug circuit open. Most often the glow plug itself has burnt out.

Usual causes: burnt-out glow plug; brittle or broken glow plug wiring; glow plug control module

Not sure what P0671 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.