P0957 Auto Shift Manual Mode Circuit Low

P0957 indicates the auto shift manual mode circuit is low. The manual mode enable signal is grounded, missing voltage, or below 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 replace shift solenoids for missing manual mode until the low mode-enable circuit is repaired.

Symptoms of P0957

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 P0957

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 manual mode signal voltage, reference feed, ground, and continuity while moving the selector through automatic and manual gates.
Inspect shifter switch contacts, connector terminals, short-to-ground faults, liquid intrusion, and wiring flex points around the console.
Compare low input status with gear display, manual mode entry, upshift and downshift request data, and range sensor state.

Related OBD-II codes

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