P0380moderate severityPowertrain
Glow Plug/Heater Circuit A
on 2007 Audi Q7 3.0L TDI V6 · AWD
What this code means
Malfunction in the glow plug heating circuit. Glow plugs are used in diesel engines to preheat the combustion chamber for cold starting.
Symptoms
- Check Engine Light
- Hard cold starting
- White smoke on cold start
- Extended cranking
- Rough idle when cold
Common causes
- Faulty glow plug(s)
- Glow plug relay failure
- Glow plug module failure
- Wiring damage
- Blown fuse
Diagnostic steps
- Test individual glow plug resistance (typically 0.5-2 ohms)
- Check glow plug relay
- Test glow plug module
- Check fuse
- Inspect wiring
Repair notes
Test each glow plug individually. Replace any with open circuit or high resistance. Check relay/module.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1