P0681 Cylinder 11 Glow Plug Circuit

P0681 indicates a cylinder 11 glow plug circuit problem. The controller detected abnormal continuity, voltage, or current in the cylinder 11 glow plug circuit.

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 start with module replacement when one cylinder-specific glow plug circuit can be isolated directly.

Useful checks before replacing parts

Check cylinder 11 glow plug resistance, module command, voltage drop, current draw, battery condition, and freeze-frame temperature data.
Inspect cylinder 11 wiring, connector corrosion, terminal tension, module output, harness heat exposure, and possible shorts or opens.
Compare cylinder 11 current draw with remaining cylinders to determine whether the fault follows the plug or the control circuit.

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.