Failed glow plug on cylinder 10 (open-circuit heating element); Damaged, corroded or loose wiring or connector between the glow plug and the control module; Corroded or loose glow plug terminal or supply connection; Blown fuse or fusible link in the glow plug supply; Faulty glow plug control module output stage; Wrong cylinder identification for the engine layout leading to a misdiagnosed plug.

P0680

Cylinder 10 Glow Plug Circuit/Open.

Generic
Powertrain
Generic code
Low severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
6: AreaComputer and output circuits
80: FaultThe specific fault in that area

What it means

P0680 is the generic code for a fault in the cylinder 10 glow plug circuit, where the control unit has detected an open circuit. The glow plug control module or engine control unit checks the current or voltage on each glow plug output and found no expected flow for this plug. It only applies to diesel engines with at least ten cylinders, so it is rare and the cylinder numbering depends on the manufacturer.

Symptoms

Glow plug or engine management warning light on
Harder starting in cold weather
Rough running or white smoke on a cold start
Slightly increased cold-start emissions and noise
Possible reduced idle quality until the engine warms up

Possible causes

Failed glow plug on cylinder 10 (open-circuit heating element)likely
Damaged, corroded or loose wiring or connector between the glow plug and the control modulelikely
Corroded or loose glow plug terminal or supply connectionpossible
Blown fuse or fusible link in the glow plug supplypossible
Faulty glow plug control module output stagepossible
Wrong cylinder identification for the engine layout leading to a misdiagnosed plugrare

How to diagnose

Read the stored codes and freeze frame data, and note whether other glow plug codes are present as well
Check the manufacturer's information for which physical cylinder is number 10 on this engine
Inspect the glow plug wiring, connector and terminal for damage, corrosion, heat damage or looseness
Check the relevant fuse and the supply voltage to the glow plug control module
Measure the glow plug resistance and compare it with the specification for the engine
Check for continuity and short circuits in the wiring between the module and the plug
With the glow plug system activated, check the module output for voltage and current as per the workshop procedure
Clear the code after repair and confirm it does not return on a cold start

How to fix

Replace the failed glow plug, using the correct specification for the engine and tightening to the specified torque
Repair or replace damaged wiring, connectors or terminals
Clean and secure corroded or loose connections
Replace the blown fuse after finding and correcting the cause
Replace the glow plug control module if its output is confirmed faulty

Can I keep driving?

Low severity

The car can normally be driven, as one failed glow plug mainly affects cold starting. Book it in soon, especially before cold weather, and avoid repeated long cranking attempts.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.