P3835
DEF Tank Level Sensor Malfunction
2009-2013 Audi A3 2.0L TDI
Moderate SeverityPowertrainGeneric (SAE)
Description
The DEF tank level sensor is reporting incorrect or no reading.
Symptoms
- DEF level gauge inaccurate
- False low DEF warning
- Cannot determine DEF level
- Potential unnecessary derate warning
- Service message for DEF
Common Causes
- Level sensor float stuck
- Sensor wiring corrosion
- Crystallized DEF on sensor
- Tank sender unit failure
- Short circuit in sensor
Diagnostic Steps
- Read DEF level PID and compare to actual
- Inspect DEF tank sender unit
- Check sensor wiring for corrosion
- Test sensor resistance range
- Add known quantity of DEF and check reading
Repair Notes
Replace DEF tank level sender unit. Clean DEF tank if crystallization is present.
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
P3835 on Other Vehicles
Common Questions
What does code P3835 mean on a 2009-2013 Audi A3?
P3835 stands for "DEF Tank Level Sensor Malfunction". The DEF tank level sensor is reporting incorrect or no reading.
What are the symptoms of P3835 on a Audi A3?
Common symptoms of P3835 include: DEF level gauge inaccurate, False low DEF warning, Cannot determine DEF level, Potential unnecessary derate warning, Service message for DEF.
What causes P3835 on a 2009-2013 Audi A3?
Common causes of P3835 include: Level sensor float stuck, Sensor wiring corrosion, Crystallized DEF on sensor, Tank sender unit failure, Short circuit in sensor.