P0758 Shift Solenoid B Electrical

P0758 points to an electrical fault in shift solenoid B. The circuit is abnormal before a hydraulic or mechanical diagnosis should take priority.

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 replace hydraulic parts until the shift solenoid B circuit has been tested for opens, shorts, and connector problems.

Symptoms of P0758

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 P0758

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

Check solenoid B power feed, control circuit, connector condition, internal harness, case connector, and terminal fit.
Measure resistance or current using the transmission service procedure and compare with known-good circuits.
Inspect for shared feed issues if multiple solenoid electrical codes are stored together.

Related OBD-II codes

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