OBD
P068F
Cylinder 8 Glow Plug Control Circuit High
What it means
P068F means Cylinder 8 Glow Plug Control Circuit High.
Check these first
- A short to voltage in the cylinder 8 control wire
- High resistance in the control circuit
- A failed glow plug in cylinder 8
- Corroded control wiring
- A faulty glow plug control module
What to do next
- Monitor the cylinder 8 control voltage live
- Trace the wire for a short to power
- Test the glow plug and connector
- Inspect the harness for damage
- Replace the module if the fault stays
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.