Code Definition

P0956 — ASM Mode Circuit Range/Performance

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

About P0956

P0956 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 P0956 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour.

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 P0956 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 P0956 fault code is set when the control module detects a range or performance issue in the ASM (Adaptive Shift Control) mode circuit, specifically pertaining to the selection of different driving modes such as performance, winter, or sport. These modes are designed to modify the transmission's shift strategy to accommodate various driving conditions and preferences. A range or performance issue in this circuit suggests that the operation of the mode selection system is either outside the normal parameters specified by the manufacturer or is not functioning efficiently. This could be due t...

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