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P0683 fault code: what it means

P0683: Glow plug control module to ECM communication fault.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

  1. glow plug module wiring fault
  2. failed glow plug module
  3. corroded connector

P0683 by make

Ford

Glow plug control module can't talk properly with the engine computer. Glow plugs may not work, so cold starts are hard.

Usual causes: wiring between modules; failed glow plug control module; poor earth

Not sure what P0683 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.