P0937 Hydraulic Oil Temperature Sensor Circuit

P0937 points to a hydraulic oil temperature sensor circuit fault. The controller cannot trust the temperature feedback for the hydraulic system.

Code details

Generic OBD-II · P0

System: Transmission
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not diagnose pressure-control behavior until the hydraulic oil temperature signal is plausible.

Symptoms of P0937

Harsh, delayed, or slipping shifts, or being stuck in one gear.
Check-engine light, sometimes with limp-home mode.
Flaring RPM or a shudder under load.

Common causes of P0937

Low or degraded transmission fluid.
A failing speed sensor, shift solenoid, or pressure-control circuit.
Wiring, connector, or internal hydraulic/mechanical faults.

Useful checks before replacing parts

Compare hydraulic oil temperature with transmission fluid temperature, ambient temperature, and sensor data after a cold soak.
Check sensor signal, reference voltage, ground, connector condition, continuity, internal harness routing, and fluid intrusion.
Review whether pressure, pump, actuator, or shift-control faults appear when the temperature signal is implausible.

Related OBD-II codes

These nearby transmission entries can help compare wording and pin down the fault area.