P0676 Cylinder 6 Glow Plug Circuit

P0676 points to a cylinder 6 glow plug circuit problem. The glow plug path for cylinder 6 shows an open, short, or abnormal current draw.

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 ignore high resistance in the harness or connector when the glow plug itself tests within range.

Symptoms of P0676

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 P0676

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

Check cylinder 6 glow plug resistance, module command voltage, current draw, connector condition, battery voltage, and freeze-frame starting temperature.
Inspect the cylinder 6 glow plug lead, terminal fit, harness routing near heat, corrosion, module output pin, and possible open or short circuits.
Compare cylinder 6 electrical response with adjacent cylinders before deciding whether the plug or module output is faulty.

Related OBD-II codes

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