Code Definition

P0952 — ASM Control Circuit Low

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

About P0952

P0952 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 P0952 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 P0952 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 P0952 fault code is activated when the control module detects a low voltage condition in the ASM (Adaptive Shift Control) control circuit. This circuit is integral to the automatic transmission system, managing gear shifts by adapting to the driver's behaviour and the vehicle's operating conditions. A low voltage in the ASM control circuit can suggest an electrical issue such as a short to ground, a reduction in voltage supply, or a fault within the control elements like shift solenoids or the Transmission Control Module (TCM). A low voltage condition can lead to inadequate operation of th...

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