English-first OBD-II diagnostics Static, fast, focused lookup pages
CD CheckDTC Garage-grade fault lookup
Browse codes Try AI Diagnose
Home / Codes / P0672
DTC code page

P0672: Cylinder 2 Glow Plug Circuit/Open

Quick answer: The ECU detected an open or fault in the cylinder 2 glow plug circuit.

Drivers also search this fault as cylinder 2 glow plug circuit, glow plug 2 open, cylinder 2 preheat fault.

Severity: medium Family: powertrain Related paths: 10
Meaning

What P0672 usually means

P0672 means the cylinder 2 preheat circuit is not behaving as expected during glow plug operation. Like the other cylinder-specific glow plug codes, it matters most when the engine is cold and needs help initiating clean combustion. If the engine starts but chugs, smokes, or misses briefly after a cold soak, P0672 belongs near the top of the diagnostic list instead of being dismissed as a minor electrical nuisance.

Fast triage

Start here before chasing parts

  • Scan first: save freeze-frame and pending codes before clearing anything.
  • Confirm the complaint: compare the stored code with current drivability symptoms.
  • Use context: trims, live data, and related codes usually narrow the fault faster than guesswork.
  • Work simplest to hardest: leaks, connectors, maintenance items, and known patterns before expensive components.
Initial checks

What to check first

  • Compare cylinder 2 plug resistance with neighboring cylinders before buying parts.
  • Inspect the cylinder 2 connector for looseness or carbon-tracked contamination.
  • Use the temperature sensitivity of the complaint as a clue: worse cold usually supports a true glow plug issue.
Driving risk

Can you keep driving?

P0672 is usually a cold-start reliability issue more than a warm-driveability issue. Still, delaying repair can let a minor rough start become a no-start in colder weather.

Moderate urgency: This code often allows short-term driving, but the right fix usually comes faster when you diagnose it early instead of waiting for more codes.
Symptoms

Common symptoms

Likely causes

Common causes behind this code

  • Failed cylinder 2 glow plug element
  • Open or high-resistance wiring to cylinder 2
  • Poor terminal contact at the glow plug
  • Corroded connector or bus bar
  • Controller driver issue affecting cylinder 2

Cause phrases often tied to this code: failed glow plug, open harness, corroded connector, high resistance circuit, controller output issue.

Diagnostic order

Suggested workflow

  1. Confirm P0672 and identify the exact cylinder 2 location for the engine family.
  2. Measure the glow plug and compare it with known-good cylinders.
  3. Check for voltage delivery and voltage drop during the preheat cycle.
  4. Inspect the connector and harness for opens or excessive resistance.
  5. Repair the circuit or replace the failed plug, then retest after a cold soak.
Avoid guesswork

Common mistakes

  • Treating every brief cold-start stumble as an injector balance problem first.
  • Replacing the plug without checking whether the control circuit can actually feed it.
  • Forgetting that multiple weak glow plugs can stack into one severe cold-start complaint.
Repair path

Practical fix guidance

  • Replace the failed cylinder 2 plug or repair the open/high-resistance feed identified in testing.
  • Protect the connector against moisture and poor contact so the fix lasts beyond one winter.
  • Confirm smoke and startup roughness are reduced on the next genuine cold start.
Vehicle context

Affected brands in this MVP

Brand hubs help broaden internal linking now and can evolve into make-specific diagnostic notes later.

Aliases and common searches

English phrases tied to P0672

Useful when the driver knows the wording but not the exact DTC yet.

  • cylinder 2 glow plug circuit
  • glow plug 2 open
  • cylinder 2 preheat fault
Related search intent

Queries this page can answer naturally

  • P0672 code meaning
  • what does P0672 mean
  • cylinder 2 glow plug symptoms
  • glow plug 2 open circuit
FAQ

Quick questions about P0672

Will P0672 set only in winter?

Not always, but cold weather makes the symptoms much more obvious because the engine depends more heavily on preheat.

Can the engine still run normally once warm with P0672?

Yes. Many drivers notice the problem mainly during startup and the first minute after firing.

Is P0672 serious enough to fix soon?

Yes, especially if starts are getting longer or rougher. Glow plug faults tend to matter most when you least want starting trouble.