Credov

P0670 fault code: what it means

P0670: Glow plug control module circuit fault. Hard cold starts. On VW TDI the module or its corroded plug is common.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

  1. failed glow plug control module
  2. corroded module connector or wiring
  3. blown fuse or bad earth
  4. faulty glow plugs

P0670 by make

Audi

Glow plug control module circuit fault. Hard cold starts. On VW TDI the module or its corroded plug is common.

Usual causes: failed glow plug control module; corroded module connector or wiring; blown fuse or bad earth; faulty glow plugs

BMW

Diesel glow plug control module circuit fault. Hard cold starts and smoke likely.

Usual causes: glow plug control module; failed glow plug(s); wiring or connector

Ford

Glow plug control module circuit fault.

Usual causes: failed glow plugs (test these first); failed glow plug control module or relay; module wiring or poor connection

Land Rover

Glow plug control module circuit fault. Hard starting in the cold; may still start fine when warm.

Usual causes: faulty glow plug control module; failed glow plug(s); wiring fault

Mercedes-Benz

Glow plug control module or circuit fault.

Usual causes: failed glow plug control module; failed glow plug(s); wiring fault

Mini

Diesel glow plug control module circuit fault. Hard cold starts likely.

Usual causes: glow plug control module; failed glow plug(s); wiring or connector

Skoda

Glow plug control module circuit fault. Hard cold starts. On VW TDI the module or its corroded plug is common.

Usual causes: failed glow plug control module; corroded module connector or wiring; blown fuse or bad earth; faulty glow plugs

Volkswagen

Glow plug control module circuit fault. Hard cold starts. On VW TDI the module or its corroded plug is common.

Usual causes: failed glow plug control module; corroded module connector or wiring; blown fuse or bad earth; faulty glow plugs

Volvo

Glow plug control module circuit.

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

What the repair usually costs

Not sure what P0670 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.