OBD
P0677
Cylinder 7 Glow Plug Circuit/Open
What it means
P0677 means Cylinder 7 Glow Plug Circuit/Open.
Check these first
- An open glow plug in cylinder 7
- Damaged wiring to the cylinder 7 glow plug
- A loose or corroded glow plug connector
- A blown glow plug fuse
- A failed glow plug relay
What to do next
- Measure cylinder 7 glow plug resistance
- Check the glow plug fuse first
- Inspect the harness and connector at cylinder 7
- Test the relay output during the glow cycle
- Replace the glow plug if it reads open
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.