P3834
DEF Supply Pump Pressure Low
2009-2013 Audi A3 2.0L TDI
Moderate SeverityPowertrainGeneric (SAE)
Description
The DEF supply pump is not generating sufficient pressure to properly atomize DEF through the dosing valve.
Symptoms
- DEF system malfunction light
- Insufficient DEF dosing
- SCR efficiency reduced
- Potential derate
- Check Engine Light
- Poor atomization of DEF spray
Common Causes
- DEF pump wear
- DEF filter clogged
- Air in DEF supply lines
- DEF line leak
- DEF frozen in lines or tank
Diagnostic Steps
- Check DEF supply pressure with scan tool
- Inspect DEF filter condition
- Check DEF lines for air leaks
- Verify DEF line heaters working
- Test pump motor operation
Repair Notes
Replace DEF supply pump or filter. Purge air from DEF lines. Check and repair DEF line heaters for cold weather operation.
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
P3834 on Other Vehicles
Common Questions
What does code P3834 mean on a 2009-2013 Audi A3?
P3834 stands for "DEF Supply Pump Pressure Low". The DEF supply pump is not generating sufficient pressure to properly atomize DEF through the dosing valve.
What are the symptoms of P3834 on a Audi A3?
Common symptoms of P3834 include: DEF system malfunction light, Insufficient DEF dosing, SCR efficiency reduced, Potential derate, Check Engine Light, Poor atomization of DEF spray.
What causes P3834 on a 2009-2013 Audi A3?
Common causes of P3834 include: DEF pump wear, DEF filter clogged, Air in DEF supply lines, DEF line leak, DEF frozen in lines or tank.