Code Definition

P0944 — Hydraulic Pressure Unit Loss of Pressure

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

About P0944

P0944 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.

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 P0944 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 P0944 fault code is set when the control module detects a loss of pressure in the hydraulic pressure unit. This unit is a critical component in systems such as the automatic transmission or power steering, where it maintains and controls hydraulic pressure. Loss of pressure can be indicative of a leak within the hydraulic system, a malfunction in the hydraulic pressure unit (such as failing valves or seals), or issues with the system's ability to maintain pressure (like a failing pump). A loss of hydraulic pressure can significantly impact the performance of the system, potentially leading...

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