P0759 Shift Solenoid B Intermittent

P0759 indicates an intermittent shift solenoid B fault. The transmission controller sees a solenoid B circuit or response dropout.

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 intermittent solenoid faults from a cold stationary test alone; road-test conditions matter.

Symptoms of P0759

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 P0759

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 solenoid B command with actual gear ratio, shift timing, input speed, output speed, and pressure data when available.
Inspect transmission connector condition, internal harness movement, solenoid resistance, terminal fit, and heat-sensitive opens.
Review companion shift or ratio codes to identify whether the problem is electrical, hydraulic, or mechanical.

Related OBD-II codes

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