DEF Dosing Valve Stuck Open
2009-2013 Audi A3 2.0L TDI
Description
The DEF dosing valve is stuck in the open position, causing excessive DEF injection into the exhaust.
Symptoms
- DEF consumption very high
- White exhaust smoke (DEF steam)
- Ammonia smell from exhaust
- DEF tank empties rapidly
- SCR system over-dosing
- Possible SCR catalyst damage from excess urea
Common Causes
- Dosing valve stuck mechanically
- Solenoid energized continuously
- Control module error commanding open
- DEF pressure forcing valve open
- Valve return spring broken
Diagnostic Steps
- Monitor DEF dosing rate vs commanded
- Check DEF consumption rate
- Test valve solenoid de-energized state
- Inspect valve for mechanical damage
- Read dosing module fault codes
Repair Notes
Replace DEF dosing valve. Inspect SCR catalyst for ammonia slip or urea deposit damage.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P3833 on Other Vehicles
Common Questions
What does code P3833 mean on a 2009-2013 Audi A3?
P3833 stands for "DEF Dosing Valve Stuck Open". The DEF dosing valve is stuck in the open position, causing excessive DEF injection into the exhaust.
What are the symptoms of P3833 on a Audi A3?
Common symptoms of P3833 include: DEF consumption very high, White exhaust smoke (DEF steam), Ammonia smell from exhaust, DEF tank empties rapidly, SCR system over-dosing, Possible SCR catalyst damage from excess urea.
What causes P3833 on a 2009-2013 Audi A3?
Common causes of P3833 include: Dosing valve stuck mechanically, Solenoid energized continuously, Control module error commanding open, DEF pressure forcing valve open, Valve return spring broken.