Symptoms of P0947
- 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 P0947
- 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
- Measure relay control voltage, feed, ground, output voltage, coil resistance, and voltage drop while the pump is commanded on.
- Inspect short-to-ground faults, relay socket terminals, fuse supply, module driver output, pump wiring, and connector corrosion.
- Compare low relay circuit events with pump operation, pressure build, pressure unit cycling, and freeze-frame system voltage.
Related OBD-II codes
These nearby transmission entries can help compare wording and pin down the fault area.