Code Definition

P0955 — ASM Mode Circuit [Perf / Winter / Sport] Error

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

About P0955

P0955 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 P0955 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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 P0955 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 P0955 fault code is set when the control module detects an error in the ASM (Adaptive Shift Control) mode circuit, specifically related to the performance, winter, and sport modes. These modes adjust the transmission's shift strategy to suit different driving conditions and preferences, like enhanced performance, better traction in winter conditions, or a sportier driving experience. An error in this circuit could be due to faulty wiring, a malfunction in the control module, or issues with the switches or sensors that select and communicate these mode settings. An error in this circuit can...

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