Faulty cylinder 6 glow plug (internal short or open circuit); Damaged wiring to the cylinder 6 glow plug, such as chafing causing a short to ground; Corroded, loose or contaminated connector or terminal at the glow plug or control module; Corroded or loose glow plug supply or earth connection; Faulty glow plug control module or driver stage in the engine control unit; Blown fuse or failed relay in the glow plug supply (depends on model and layout).

P067E

Cylinder 6 Glow Plug Control Circuit Low.

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
7E: FaultThe specific fault in that area

What it means

P067E is the generic code for a low signal in the glow plug control circuit for cylinder 6, so it only applies to diesel engines with at least six cylinders. The engine control unit (or glow plug control module) commands the glow plug and monitors the circuit. It saw a voltage or current lower than expected, which points to a short to ground or an open or faulty circuit on that channel.

Symptoms

Glow plug or engine management warning light on
Hard starting in cold weather
White smoke and rough running on a cold start
Misfire or uneven idle until the engine warms up
Slightly higher emissions or fuel use when cold
No noticeable symptoms when the engine is warm

Possible causes

Faulty cylinder 6 glow plug (internal short or open circuit)likely
Damaged wiring to the cylinder 6 glow plug, such as chafing causing a short to groundlikely
Corroded, loose or contaminated connector or terminal at the glow plug or control modulepossible
Corroded or loose glow plug supply or earth connectionpossible
Faulty glow plug control module or driver stage in the engine control unitpossible
Blown fuse or failed relay in the glow plug supply (depends on model and layout)rare

How to diagnose

Read all stored and pending codes and the freeze frame data, noting engine temperature and battery voltage when the fault set; check for other glow plug codes on different cylinders.
Check the battery condition and charging voltage, as low supply voltage can upset glow plug circuit monitoring.
Visually inspect the cylinder 6 glow plug wiring, connector and terminal for heat damage, chafing, corrosion and water ingress.
Check the relevant fuses and relays for the glow plug system; the layout depends on the model and engine.
Measure the cylinder 6 glow plug resistance with the plug disconnected and compare it with the manufacturer's specification.
Check the glow plug feed and earth circuits for continuity, and for a short to ground, using the wiring diagram for that engine.
Use a bidirectional scan function, if the vehicle supports it, to command the glow plugs and check the current draw and voltage on the cylinder 6 channel.
If the wiring and glow plug test correctly, check the control module power, earth and output signal before suspecting the module.

How to fix

Replace the faulty cylinder 6 glow plug, following the manufacturer's torque figure and procedure, as seized plugs can snap.
Repair or replace damaged wiring or the connector on the cylinder 6 glow plug circuit.
Clean and secure corroded or loose terminals and earth points, and replace any that are damaged.
Replace the blown fuse or faulty relay after finding out why it failed.
Repair or replace the glow plug control module or engine control unit if testing confirms a fault, and apply any relevant software update if the manufacturer lists it as a fix.

Can I keep driving?

Low severity

The car can usually be driven, but cold starting may be poor and a cold engine may run roughly. Book it in soon, especially before cold weather, and avoid repeated long cranking.

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