Code Definition

P0942 — Hydraulic Pressure Unit Circuit Malfunction

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

About P0942

P0942 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 P0942 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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 P0942 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 P0942 fault code is set when the control module detects a malfunction in the hydraulic pressure unit circuit. This circuit is part of the vehicle's hydraulic system, which may include components like the transmission's hydraulic control unit or the power steering system. The malfunction typically indicates a failure in the electrical or mechanical components of the hydraulic pressure unit, affecting its ability to maintain or regulate hydraulic pressure accurately. This issue can arise from faulty solenoids, sensors, wiring issues, or problems with the hydraulic pressure unit itself. A mal...

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