Code Definition

P0950 — ASM Control Circuit [Up / Down / Auto] Error

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

About P0950

P0950 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 P0950 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 P0950 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 P0950 fault code is set when the control module detects an error in the ASM (Adaptive Shift Control) control circuit, specifically related to the upshift, downshift, and auto shift functions. This circuit is part of the system that manages gear shifting in automatic transmissions, adapting to the driver's habits and the vehicle's operating conditions. The error in this circuit could be due to issues such as faulty wiring, a malfunction in the control module, or problems with the shift solenoids that execute the upshift, downshift, and automatic shift commands. An error in this circuit can ...

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