P0683 — Glow Plug Control Module to PCM Communication Circuit
| Meaning | The engine computer has detected a communication fault with the glow plug control module, which is the unit responsible for managing the pre-heating system in diesel engines. This means the computer cannot properly coordinate the glow plugs needed for starting and warming up the engine. |
| Family | Powertrain (P) |
Typical symptoms
Glow plug warning light flashing or staying on
Rough idle after starting
Common causes
Blown fuse or relay for the glow plug system
Failed glow plug control module
What to do
Frequently asked questions
What does code P0683 mean?
Glow Plug Control Module to PCM Communication Circuit. The engine computer has detected a communication fault with the glow plug control module, which is the unit responsible for managing the pre-heating system in diesel engines. This means the computer cannot properly coordinate the glow plugs needed for starting and warming up the engine.
Can I keep driving with code P0683 active?
With caution: limp mode possible, have it checked soon
Common causes — P0683
Faulty wiring or loose connector at the glow plug control module Blown fuse or relay for the glow plug system Failed glow plug control module
How do you fix code P0683?
Check the fuses and the main electrical connector to the glow plug module for corrosion or loose pins. Have this checked soon, as a persistent starting issue will eventually put extra wear on your starter motor and battery.
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