P0675
Cylinder 5 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
- 75
- FaultThe specific fault in that area
What it means
P0675 is the generic code for a fault in the glow plug circuit for cylinder 5, reported as an open circuit. The engine control unit or glow plug control module monitors the glow plug output and sets the code when it sees no current flow or a circuit state that suggests a break. This applies to diesel engines, and which cylinder is number 5 depends on the engine's firing order and layout.
Symptoms
- Engine warning light or glow plug warning light on
- Hard starting or extended cranking on cold mornings
- White smoke and rough running just after a cold start
- Misfire or uneven idle until the engine warms up
- Slightly higher emissions or fuel use when cold
Possible causes
- Failed glow plug on cylinder 5 (open internal element)likely
- Corroded, loose or damaged glow plug connector or terminal at cylinder 5likely
- Damaged, chafed or broken wiring between the glow plug control module and cylinder 5 plugpossible
- Poor power or earth supply to the glow plug control module, or a blown fuse or relay in the glow plug supplypossible
- Faulty glow plug control module output stage for cylinder 5possible
- Software or calibration fault in the control module, where the manufacturer has issued an update for this coderare
How to diagnose
- Read all stored codes and freeze frame data, noting engine temperature and battery voltage when the code set, and check for other glow plug codes on different cylinders.
- Check the manufacturer data to confirm which physical cylinder is number 5 on this engine and where its glow plug sits.
- Visually inspect the cylinder 5 glow plug connector, wiring and the loom path for heat damage, chafing, corrosion or loose terminals.
- Check the relevant fuses, relays and the power and earth supplies to the glow plug control module.
- With the plug disconnected, measure the resistance of the cylinder 5 glow plug and compare it with the specification for the engine.
- Check for voltage and signal at the cylinder 5 connector during the glow cycle, using a live data tool or the wiring diagram to command or observe the circuit.
- Check the wiring continuity and for shorts between the module and the plug connector.
- Check for any technical bulletins or software updates for the module on this model.
How to fix
- Replace the failed cylinder 5 glow plug, using the correct specification and torque, taking care not to snap the plug when removing it.
- Clean or repair the connector and terminals, or replace the connector if it is damaged or corroded.
- Repair or replace damaged wiring between the control module and the glow plug.
- Restore the power or earth supply, or replace the faulty fuse or relay once the reason for failure is found.
- Replace the glow plug control module if the output is confirmed faulty after wiring and plug checks.
- Apply a manufacturer software update to the module if an outdated calibration is a known cause for this engine.
Can I keep driving?
Low severity
The car can usually be driven, as the engine will still run once warm, but cold starting and smoke may get worse. Book the repair soon, and avoid forcing repeated cold starts in cold weather.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.