Code Definition

P0590 — Cruise control multifunction switch signal stuck - Circuit B

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

About P0590

P0590 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 P0590 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 P0590 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 that the signal from Circuit B of the cruise control multifunction switch is stuck in a specific position or state. The cruise control multifunction switch is a critical component of the cruise control system, used to set, regulate, and deactivate cruise control speeds. A 'stuck signal' in Circuit B implies that the switch is not transitioning as expected between different states or positions, potentially leading to continuous activation or non-responsiveness of certain cruise control functions...

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