Code Definition

P0951 — ASM Control Circuit Range/Performance

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

About P0951

P0951 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 P0951 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 P0951 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 P0951 fault code is set when the control module detects a range or performance issue in the ASM (Adaptive Shift Control) control circuit. This circuit is a crucial part of the transmission's system that manages gear shifts in automatic transmissions, adapting the shifting strategy based on the driver's habits and the vehicle's operational conditions. A range or performance issue in this circuit indicates that the operation of the ASM control system is either not within the manufacturer's specified parameters or not performing efficiently. This could be due to malfunctions in the shift sole...

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