Code Definition

P0947 — Hydraulic Pump Relay Circuit Low

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0947

P0947 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0947 is stored, the module has detected a signal or supply voltage lower than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0947 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0947 fault code is set when the control module detects a low voltage condition in the hydraulic pump relay circuit. This relay is essential for controlling the power supply to the hydraulic pump, which is a key component in systems like the transmission or power steering. A low voltage condition in this circuit suggests an electrical issue, such as a potential short circuit to ground, reduced voltage supply, or a fault within the relay itself. This can lead to insufficient power being supplied to the hydraulic pump, potentially resulting in a loss of hydraulic pressure and adversely affec...

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