Code Definition

P0581 — Cruise Control Multifunction Switch Signal High - Circuit A

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

About P0581

P0581 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 P0581 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 P0581 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

This fault code is set when the engine control module (ECM) or the body control module (BCM) detects a higher than normal voltage signal from the cruise control multifunction switch, specifically in Circuit A. This switch is an integral part of the vehicle's cruise control system and is used to set, adjust, and deactivate cruise control speeds. A high signal in this context typically indicates an electrical fault such as a short to power in Circuit A of the switch. This condition can lead to erratic or non-functional cruise control operation.

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