P0672 Cylinder 2 Glow Plug Circuit

P0672 points to a cylinder 2 glow plug circuit fault. The cylinder 2 glow plug path has an electrical fault or abnormal current response.

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 assume a hard-start complaint is fuel related until the cylinder 2 glow plug circuit is measured under command.

Symptoms of P0672

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 P0672

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 2 glow plug resistance, module command, voltage drop, current draw, battery condition, coolant temperature, and freeze-frame data.
Inspect the cylinder 2 glow plug connector, harness routing, terminal fit, heat damage, corrosion, and possible shorts or opens in the lead.
Compare cylinder 2 current and resistance with neighboring cylinders to identify whether the plug, wiring, or module output is responsible.

Related OBD-II codes

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