P0764 Shift Solenoid C Intermittent

P0764 points to an intermittent shift solenoid C fault. Solenoid C operation or its control circuit becomes unreliable under some conditions.

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 assume every intermittent solenoid C code means the solenoid is mechanically stuck.

Symptoms of P0764

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 P0764

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

Record solenoid C command, circuit state, shift timing, actual ratio, and fluid temperature during a repeatable drive cycle.
Check internal transmission harness, case connector, terminal tension, solenoid resistance, and fluid contamination at connectors.
Separate a circuit dropout from a stuck valve or hydraulic problem by comparing electrical data with ratio changes.

Related OBD-II codes

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