P0673 Cylinder 3 Glow Plug Circuit

P0673 indicates a cylinder 3 glow plug circuit fault. The glow plug circuit for cylinder 3 is open, shorted, or drawing abnormal current.

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 remove a glow plug unnecessarily before external resistance, voltage, and current checks are complete.

Useful checks before replacing parts

Measure cylinder 3 glow plug resistance, commanded voltage, current draw, battery voltage, coolant temperature, and freeze-frame starting conditions.
Inspect cylinder 3 glow plug wiring, connector terminals, module output pin, harness heat damage, corrosion, and short-to-ground or open faults.
Compare cylinder 3 readings with other cylinders and repeat the test during a 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.