P0678
Cylinder 8 Glow Plug Circuit/Open
P0678 is an OBD-II diagnostic trouble code meaning: Cylinder 8 Glow Plug Circuit/Open. Common causes: burnt-out glow plug for cylinder 8, broken power wire. Estimated repair cost: $22–67.
Symptoms
- Difficulty starting a diesel engine in cold weather
- Check Engine Light
- White smoke on cold start
- Unstable engine operation after starting
- Glow plug indicator on the dashboard
Causes
- Burnt-out glow plug for cylinder 8
- Broken power wire
- Oxidation or poor contact in the connector
- GPCM module malfunction
- Wiring damage
How to Fix
- Read OBD-II error codes
- Measure the resistance of the spark plug of cylinder 8 (standard: 0.5–2 Ohm)
- Inspect the wiring and spark plug connector
- Check the supply voltage at the spark plug terminal
- Replace a faulty glow plug
- If the error occurs again, check GPCM
Related codes
Error P0678 by Vehicle Brand
FAQ
What does the P0678 code mean?
P0678 is an OBD-II diagnostic trouble code that indicates: Cylinder 8 Glow Plug Circuit/Open
What causes a P0678 error code?
The most common causes of P0678 include: Burnt-out glow plug for cylinder 8; Broken power wire; Oxidation or poor contact in the connector; GPCM module malfunction.
How do I fix a P0678 diagnostic trouble code?
To fix P0678: Read OBD-II error codes. Measure the resistance of the spark plug of cylinder 8 (standard: 0.5–2 Ohm). Inspect the wiring and spark plug connector. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0678?
Yes, but get it checked soon
How much does it cost to fix P0678?
The estimated repair cost for P0678 is $22–67. Actual cost depends on your vehicle, location, and labor rates.
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