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P code powertrain High severity

P2064 Reductant/Regeneration Supply Control Circuit High

The OBD2 code P2064 indicates that there is a high voltage detected in the reductant or regeneration supply control circuit, which is part of the vehicle's emissions control system

Definition

The OBD2 code P2064 indicates that there is a high voltage detected in the reductant or regeneration supply control circuit, which is part of the vehicle's emissions control system

Common causes

  • Faulty reductant pump
  • Open or shorted wiring in the control circuit
  • Failed reductant control module
  • Poor electrical connections
  • Faulty fuel level sensor
  • Defective ECM (Engine Control Module)
  • Blocked or restricted reductant lines
  • Low reductant fluid level

Common misdiagnoses

  • Faulty fuel injectors
  • Defective fuel pump
  • Clogged fuel filter
  • Bad engine control module (ECM)
  • Wiring issues or shorts in the circuit
  • Faulty sensors (e.g., temperature or pressure sensors)
  • Exhaust system issues
  • Incorrectly diagnosed emissions system problems
  • Problems with the diesel exhaust fluid (DEF) system
  • Issues with the catalytic converter

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues

  2. 2. Inspect Wiring and Connectors

    Visually inspect the wiring and connectors associated with the reductant supply control circuit. Look for signs of damage, corrosion, or loose connections. Pay special attention to the wiring harness leading to the reductant pump and the control module

  3. 3. Test the Reductant Pump

    If the vehicle is equipped with a reductant pump, test its operation. Ensure that it is functioning correctly and that it is receiving the proper voltage. You can use a multimeter to check for voltage at the pump connector

  4. 4. Check the Reductant Level

    Ensure that the DEF tank is filled to the appropriate level. Low DEF levels can sometimes trigger fault codes related to the reductant system

  5. 5. Inspect the Reductant Injector

    Check the injector for clogs or damage. A malfunctioning injector can lead to improper operation of the SCR system

  6. 6. Test the Control Module

    If the wiring and components appear to be in good condition, the issue may lie with the control module itself. Testing or reprogramming the module may be necessary

  7. 7. Check for Ground Issues

    Ensure that the ground connections for the reductant system are secure and free of corrosion. Poor grounding can lead to high voltage readings

  8. 8. Clear the Code and Test Drive

    After performing any repairs or adjustments, clear the trouble code using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  9. 9. Consult Technical Service Bulletins (TSBs)

    Check for any manufacturer-specific TSBs related to the P2064 code. There may be known issues or recalls that could provide additional guidance

  10. 10. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with diesel engines and SCR systems. By following these troubleshooting steps, you can systematically identify and resolve the issue associated with the P2064 code