Symptoms of P0773
- 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 P0773
- 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 E power, control circuit, internal harness, case connector, terminal fit, and fluid intrusion.
- Use service-information current or resistance tests to separate solenoid, wiring, and controller faults.
- Inspect shared feeds and grounds when 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.