P0672

Cylinder 2 Glow Plug Circuit/Open

Glow plug / diesel preheat Generic OBD-II High

What it means

P0672 is a diesel code meaning the glow-plug circuit for cylinder 2 is open — the module isn't seeing the expected current through that plug. Glow plugs preheat the combustion chamber for cold starting, so a single open plug mainly shows up as harder cold starts and rough running until the engine warms, not as a total no-start.

High

Can I keep driving? Usually drivable once warm, but expect hard cold starts and rough cold running until the plug is fixed — repair before winter.

Real-world scan data

Seen in

1,309

scans in the past year

Found in

0.2%

of scans

0.4%

of scans that found faults

Appears alongside · share of P0672 scans

P0673in 48.0% of scans

P0671in 43.2% of scans

P0674in 32.7% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Hard starting when the engine is cold
Rough idle or a misfire-like stumble until the engine warms up
White or excess smoke from the exhaust on a cold start
Glow-plug or check-engine warning light on

Common causes

Most likely first

Failed (open) glow plug on cylinder 2Likely
Open or broken wiring/connector to that glow plugCommon
Corroded or loose glow-plug connectionCommon
Faulty glow-plug control module, or rarely the ECMLess often

How to diagnose & fix

Work through it in order

Scan and confirm the code is cylinder 2; check for other glow-plug codes.
Measure the cylinder-2 glow plug's resistance; an open plug reads infinite.
Inspect the plug's wiring and connector for breaks or corrosion.
Check the glow-plug control-module output, then replace the failed plug or repair wiring and re-test.

FAQ

Quick answers

Is it safe to drive with P0672?+

In mild weather usually yes — the engine still runs on the heat from its other cylinders. In cold weather expect hard starts and rough warm-up; fix it before winter.

Can I just clear P0672?+

It will come back after the next cold-start cycle unless the open glow plug or its wiring is repaired.

Read & clear P0672 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX