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 status

Needs verification

Not yet verified against SAE J2012_202509 / J2012DA. Treat unverified rows as a lookup aid, not repair authority.

System: Computer
Scope: iso-sae-controlled-p0
Standard: SAE J2012 / ISO 15031-6
Source: legacy-import

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.

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 fault area. They may share the same verification status as the source database.