Code Definition

P0988 — Transmission Fluid Pressure Sensor/Switch E Circuit Range/Performance

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

About P0988

P0988 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 P0988 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; 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 P0988 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 P0988 fault code is set when the control module detects a range or performance issue in the Transmission Fluid Pressure Sensor/Switch E Circuit. This sensor or switch is a crucial component of the transmission system, responsible for monitoring hydraulic pressure in a specific area of the transmission. A range or performance issue indicates that the sensor's or switch's readings are either outside the expected range set by the manufacturer or not performing as required. This could be due to a malfunctioning sensor/switch, wiring problems, or issues within the Transmission Control Module (T...

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