Code Definition

P0946 — Hydraulic Pump Relay Circuit Range/Performance

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

About P0946

P0946 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 P0946 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour.

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 P0946 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 P0946 fault code is triggered when the control module detects a range or performance issue within the hydraulic pump relay circuit. This relay is integral to the operation of the hydraulic pump in systems such as the vehicle's transmission or power steering, as it controls the power supply to the pump. A range or performance problem in this circuit can indicate that the relay is not operating within the manufacturer's specified parameters or is functioning inefficiently. Potential causes include a malfunctioning hydraulic pump relay, issues with the electrical connections to the relay, or ...

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