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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

  1. Check DEF supply pressure with scan tool
  2. Inspect DEF filter condition
  3. Check DEF lines for air leaks
  4. Verify DEF line heaters working
  5. 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

P3832DEF Dosing Valve Stuck ClosedP3833DEF Dosing Valve Stuck OpenP3835DEF Tank Level Sensor Malfunction

Other Powertrain Codes

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.

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