What it means
The cylinder 11 glow plug circuit is not performing within the expected range. The cause may be the glow plug, its wiring or connections, or the control circuit.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The cylinder 11 glow plug warms the cylinder to aid diesel starting and combustion when the engine is cold. The control module monitors the cylinder 11 circuit and records this code when its electrical performance falls outside the expected range.
Common causes
Most likely first.
- Faulty glow plug
- Damaged or corroded wiring or connector
- Glow plug control circuit fault
Symptoms
- Glow plug warning light on (often orange coil symbol)
- Hard cold start or no start in cold weather
- White smoke from exhaust during warm-up
How to diagnose it
- Use freeze-frame and glow plug live data to identify the conditions that triggered the cylinder 11 fault and compare its response with other cylinders.
- Inspect the cylinder 11 connector and wiring for corrosion, loose contacts, insulation damage, or signs of overheating.
- Test the cylinder 11 glow plug using the manufacturer's method and compare its electrical response with the manufacturer's specification.
- Check cylinder 11 circuit continuity and connections along the harness using the vehicle wiring diagram.
- If the plug and wiring are serviceable, test the glow plug controller's cylinder 11 output and related control circuit.
Common fixes
- Clean and secure the cylinder 11 glow plug connector.
- Repair corroded terminals or damaged cylinder 11 wiring.
- Replace the cylinder 11 glow plug if it fails the manufacturer's test.
- Repair or replace the faulty controller or control-circuit component identified by testing.
Can I keep driving?
Driving may be possible if the engine starts and runs smoothly, but cold starting can deteriorate and white smoke during warm-up may increase. Avoid repeated cranking if it will not start, and fix the fault before relying on the vehicle in cold weather.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.