WOMS
P code powertrain Medium severity

P0947 Hydraulic Pump Relay Circuit Low

The OBD2 code P0947 indicates a low voltage or malfunction in the hydraulic pump relay circuit, which can affect the operation of the power steering system or transmission fluid pump

Definition

The OBD2 code P0947 indicates a low voltage or malfunction in the hydraulic pump relay circuit, which can affect the operation of the power steering system or transmission fluid pump

Common causes

  • Faulty hydraulic pump relay
  • Damaged wiring or connectors in the relay circuit
  • Low battery voltage
  • Faulty hydraulic pump
  • Poor ground connection
  • Malfunctioning engine control module (ECM)

Common misdiagnoses

  • Faulty hydraulic pump
  • Low transmission fluid level
  • Bad transmission control module (TCM)
  • Wiring issues or shorts in the relay circuit
  • Faulty relay
  • Incorrectly diagnosed transmission issues
  • Electrical connector problems
  • Faulty pressure sensor or switch

Troubleshooting steps

  1. 1. Check the Vehicle's Battery and Charging System

    Ensure the battery is fully charged and in good condition

  2. 2. Check the alternator output to ensure it is providing adequate voltage

  3. 3. Inspect the Fuses

    Locate the fuse associated with the hydraulic pump relay and check for any blown fuses. Replace any that are blown

  4. 4. Examine the Relay

    Locate the hydraulic pump relay and inspect it for any signs of damage or corrosion

  5. 5. Test the relay using a multimeter to ensure it is functioning properly. If it is faulty, replace it

  6. 6. Check Wiring and Connectors

    Inspect the wiring and connectors leading to the hydraulic pump relay and the hydraulic pump itself for any signs of damage, corrosion, or loose connections

  7. 7. Repair or replace any damaged wiring or connectors

  8. 8. Test the Hydraulic Pump

    If the relay and wiring are in good condition, test the hydraulic pump itself to ensure it is functioning properly. This may involve checking for proper voltage at the pump connector when the relay is activated

  9. 9. Scan for Additional Codes

    Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues

  10. 10. Inspect the Power Steering Fluid Level

    If the vehicle has a power steering system, check the fluid level and condition. Low or contaminated fluid can affect pump operation

  11. 11. Check for Ground Issues

    Ensure that the ground connections for the hydraulic pump and relay are secure and free of corrosion

  12. 12. Consult the Service Manual

    Refer to the vehicle's service manual for specific diagnostic procedures and specifications related to the hydraulic pump and relay circuit

  13. 13. Clear the Code and Test Drive

    After performing repairs, clear the trouble code using the OBD-II scanner and take the vehicle for a test drive to see if the code returns.1

  14. 14. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic for further diagnosis and repair. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P0947 code