Code Definition

P0957 — ASM Mode Circuit Low

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0957

P0957 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0957 is stored, the module has detected a signal or supply voltage lower than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0957 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0957 fault code is activated when the control module detects a low voltage condition in the ASM (Adaptive Shift Control) mode circuit. This circuit is involved in the selection of various transmission modes such as performance, winter, or sport, each altering the transmission's shift patterns to suit different driving preferences and conditions. A low voltage condition in this circuit can indicate an electrical issue, such as a short to ground, a decrease in voltage supply, or a fault within the mode selection components like switches or sensors. This condition can lead to inadequate oper...

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