OBD Codes List

Diagnostic reference · P0947

P0947

Hydraulic Pump Relay/Control Circuit Low

System
Transmission (P code)
Lamp
Check Engine Light
Category
Powertrain - Transmission

What it means

P0947 means Hydraulic Pump Relay/Control Circuit Low.

Where it lives

For P0947, the circuit described runs through the relay. The description of P0947 reports a fault at the relay.

Check these first

  • A short to ground in the hydraulic pump relay circuit
  • A chafed pump relay control wire
  • A weak battery dragging the relay circuit
  • A failed pump relay coil

What to do next

  1. Read hydraulic pump relay voltage on a scan tool
  2. Test the pump relay circuit for a short to ground
  3. Check the battery voltage and charging
  4. Measure the pump relay coil resistance
  5. Replace the relay if the coil is shorted
  6. Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.