P0680 Cylinder 10 Glow Plug Circuit

P0680 points to a cylinder 10 glow plug circuit fault. The glow plug circuit for cylinder 10 is not responding with the expected electrical load.

Code details

Generic OBD-II · P0

System: Computer
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not confuse cylinder numbering across engine layouts; confirm cylinder 10 location before disconnecting parts.

Symptoms of P0680

Check-engine light, sometimes with several unrelated codes at once.
Warning lights, a no-start, or intermittent electrical faults.
Communication or module-reset problems on a scan tool.

Common causes of P0680

Low battery voltage, poor grounds, corroded connectors, or blown fuses.
Wiring or network (CAN bus) faults between modules.
A module software/programming issue, or rarely a failed controller.

Useful checks before replacing parts

Measure cylinder 10 glow plug resistance, command voltage, current draw, battery voltage, coolant temperature, and freeze-frame starting conditions.
Inspect cylinder 10 harness routing, connector terminals, module output pin, corrosion, heat damage, and open or shorted circuit conditions.
Compare cylinder 10 electrical behavior with other cylinders during the same commanded glow cycle.

Related OBD-II codes

These nearby computer entries can help compare wording and pin down the fault area.