Emissions

P2062 — SCR / DEF Reductant System Performance Fault

Severity: medium Drive with care, to a shop

What P2062 means

The engine control unit monitors the SCR system: the DEF pump, dosing injector, heaters, lines and NOx sensors. Urea solution is sprayed into the exhaust to cut nitrogen oxide emissions. P2062 is stored when the system's measured behavior does not match what the ECU expects. It is a general performance code, so the exact cause is found through companion codes and scan tool data.

Symptoms

  • Check engine light on
  • SCR/AdBlue warning on the dash
  • Reduced power or torque limitation
  • Start countdown or no-restart warning on some vehicles
  • Other P20xx or P2Bxx codes stored at the same time

Possible causes

  1. A combination of pump, injector and SCR catalyst faults
  2. Driving for a long time with an empty DEF tank
  3. Poor quality or diluted DEF
  4. Faulty dosing valve or clogged injector
  5. Failed tank or line heater, or frozen DEF
  6. Damaged wiring or corroded connectors on SCR components
  7. Faulty NOx sensors

How to diagnose

  1. Read all codes and freeze frame data and address companion codes first
  2. Check DEF level and quality (with a refractometer) and replace it if in doubt
  3. Use a scan tool to view dosing system status and NOx sensor readings before and after the catalyst
  4. Inspect the dosing valve, injector and lines for leaks, urea crystals and blockage
  5. Verify tank and line heater operation
  6. Check wiring and connectors of SCR components, including power and ground
  7. Look up manufacturer technical bulletins and ECU software updates

Common fixes

  • Refill or replace the DEF with proper quality fluid and flush the system
  • Clean or replace the dosing injector
  • Replace the DEF pump or supply module
  • Replace a NOx sensor or heater
  • Repair damaged wiring and connectors
  • Update ECU software, then clear codes and verify operation

Questions and answers

What does code P2062 mean?

The ECU has detected that the urea injection (SCR) system is not reaching expected performance. The cause can be the pump, injector, catalyst, fluid or wiring, and companion codes and scan data help narrow it down.

Can I drive with P2062?

For a short time, yes, but the vehicle may go into power reduction and on some models block restarts. Get it fixed as soon as you can.

Will adding DEF clear the P2062 code?

If an empty tank or bad fluid was the cause, it may, but you often need to clear the codes and let the system complete its self-test. If the code returns, check the pump, injector and sensors.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.