Code Definition

P0953 — ASM Control Circuit High

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

About P0953

P0953 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 P0953 is stored, the module has detected a signal or supply voltage higher 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 P0953 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 P0953 fault code is set when the control module detects a high voltage condition in the ASM (Adaptive Shift Control) control circuit. This circuit is a key component of the automatic transmission system, responsible for managing gear shifts by adapting to the driver's behaviour and the vehicle's operating conditions. A high voltage condition in the ASM control circuit typically indicates an electrical fault, such as a short to power or an issue within the control elements like shift solenoids or the Transmission Control Module (TCM). High voltage can lead to erratic or improper functioning...

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