Code Definition

P0989 — Transmission Fluid Pressure Sensor/Switch E Circuit Low

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

About P0989

P0989 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 P0989 is stored, the module has detected a signal or supply voltage lower 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 P0989 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 P0989 fault code is activated when the control module detects a low voltage condition in the Transmission Fluid Pressure Sensor/Switch E Circuit. This sensor or switch is an integral part of the transmission system, tasked with monitoring the hydraulic pressure in a specific segment of the transmission. A low voltage condition in this circuit can indicate an electrical problem, such as a short to ground, reduced voltage supply, or a fault within the sensor or switch itself. Low voltage can lead to inaccurate transmission fluid pressure readings, potentially affecting the transmission's ope...

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