Code Definition

P0990 — Transmission Fluid Pressure Sensor/Switch E Circuit High

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

About P0990

P0990 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 P0990 is stored, the module has detected a signal or supply voltage higher than the expected operating range; and a sensor-related fault — the reported value from the named sensor is out of spec.

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 P0990 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 P0990 fault code is set when the control module detects a high voltage condition in the Transmission Fluid Pressure Sensor/Switch E Circuit. This sensor or switch plays a crucial role in the transmission system, monitoring hydraulic pressure within a specific area of the transmission. A high voltage condition in this circuit typically suggests an electrical fault, such as a short to power or an internal issue with the sensor or switch. High voltage can result in erroneous transmission fluid pressure readings, which can impact the transmission's functionality, affecting gear shifting, hydra...

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