P06BE
Cylinder 6 Glow Plug Circuit Range/Performance.
- 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
- BE
- FaultThe specific fault in that area
What it means
P06BE is the generic code for a range or performance fault in the cylinder 6 glow plug circuit. The engine control unit (or glow plug control module) monitors the current, voltage or feedback from that glow plug circuit and saw a value outside the expected range, although not necessarily a full open or short circuit. It only applies to diesel engines with at least six cylinders, and the exact monitoring method varies by model and engine.
Symptoms
- Malfunction indicator or glow plug warning light on
- Hard starting or extended cranking in cold weather
- White smoke and rough running on a cold start
- Noticeably rougher idle until the engine warms up
- Higher than usual emissions or fuel consumption when cold
Possible causes
- Glow plug on cylinder 6 ageing, with resistance or current draw out of rangelikely
- Corroded, loose or damaged connector or terminal at the cylinder 6 glow pluglikely
- Damaged or chafed wiring between the glow plug control module and cylinder 6 plug, giving high resistancepossible
- Poor power or earth supply to the glow plug control module, such as a weak battery or corroded fuse or relay connectionspossible
- Fault in the glow plug control module output driver for cylinder 6rare
- Outdated control unit software where the manufacturer has documented a calibration cause for this coderare
How to diagnose
- Read all stored codes and freeze frame data, noting engine temperature, battery voltage and whether other glow plug codes are present.
- Check battery condition and charging voltage, as low voltage can cause range faults across the glow plug circuits.
- Visually inspect the cylinder 6 glow plug connector, wiring and the glow plug control module connector for corrosion, heat damage, chafing or looseness.
- Check the glow plug fuse and any relay or power feed connections for the glow plug system.
- Measure the resistance of the cylinder 6 glow plug against the manufacturer specification and compare it with the other plugs.
- Check current draw or live data from the glow plug control module for cylinder 6 during a cold activation, following the model-specific procedure.
- Test the wiring for continuity and unwanted resistance between the control module and the plug, and check the earth path.
- Check for any manufacturer software updates or technical bulletins for this code on the specific model.
How to fix
- Replace the cylinder 6 glow plug, and consider the full set if they are of similar age, using the correct specification and tightening torque.
- Clean or repair the connector and terminals, or replace them if damaged.
- Repair or replace damaged wiring between the control module and the glow plug.
- Restore a good power supply and earth to the glow plug system, including fuses, relays and a weak battery.
- Replace the glow plug control module only if testing confirms a faulty output and the wiring and plug are sound.
- Apply a manufacturer-approved software update where a calibration issue is confirmed as a known cause.
Can I keep driving?
The car can usually be driven, but cold starting and running may be poor, so book it in soon. Avoid repeated long cranking, and do not ignore it if the engine runs roughly or other warning lights appear.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.