P0953 Auto Shift Manual Control Circuit High

P0953 indicates a high auto shift manual control circuit. The manual shift request input is open, shorted to voltage, or above the expected range.

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 the vehicle ignored a shift command because of transmission hydraulics before testing the high request circuit.

Symptoms of P0953

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 P0953

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 manual control signal voltage, ground, open circuits, short-to-voltage faults, connector fit, and switch state transitions.
Inspect steering-wheel or shifter wiring, clock spring paths, console connectors, spilled-liquid damage, and recent trim or shifter work.
Compare high input behavior with manual mode entry, upshift and downshift requests, and gear display state.

Related OBD-II codes

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