P0680

Cylinder 10 Glow Plug Circuit/Open

Q: Is it safe to drive with P0680?

Generally yes in mild weather. A single open glow plug on a large diesel mainly causes hard cold starting and rough warm-up; repair it before cold weather.

Q: Can I just clear P0680?

It returns on the next cold start unless the open glow plug or its wiring is repaired.

Diesel glow plug / preheat Generic OBD-II High

What it means

P0680 is a diesel code for an open circuit on the cylinder 10 glow plug — typically a burned-out glow plug or a broken wire, seen on larger V8/V10 diesels. Glow plugs preheat the cylinder for starting, so the effects are hard cold starts, rough warm-up, and white smoke rather than a warm no-start.

High

Can I keep driving? Usually yes, but expect hard cold starts and rough cold running until the cylinder 10 glow plug circuit is repaired.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Appears alongside · share of P0680 scans

C0107in 83.3% 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, especially in cold weather
Rough idle or a miss until the engine warms up
White or grey exhaust smoke on a cold start
Check-engine or glow-plug warning light on

Common causes

Most likely first

Failed cylinder 10 glow plug with an open elementLikely
Open or broken wiring in the glow plug circuitCommon
Loose or corroded connector at the glow plug or moduleCommon
Faulty glow plug control moduleLess often

How to diagnose & fix

Work through it in order

Scan and confirm the open-circuit fault is on cylinder 10.
Measure the glow plug's resistance; an open reading means it needs replacing.
Inspect and repair the wiring and connector between the module and the cylinder 10 glow plug.
Verify the glow plug control module output, then clear and re-test on a cold start.

FAQ

Quick answers

Is it safe to drive with P0680?+

Generally yes in mild weather. A single open glow plug on a large diesel mainly causes hard cold starting and rough warm-up; repair it before cold weather.

Can I just clear P0680?+

It returns on the next cold start unless the open glow plug or its wiring is repaired.

Read & clear P0680 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