The P0590 trouble code indicates that the cruise control multi-function input “B” circuit is stuck. The cruise control system relies on various inputs to operate effectively, and the “B” circuit typically refers to an additional input, such as from a brake pedal switch or clutch pedal switch, depending on the vehicle’s configuration. When this circuit is stuck, it means that the input signal is not changing as expected, which can affect cruise control operation.
P0590 Cruise Control Multi-Function Input “B” Circuit Stuck
Code symptoms P0590.
1. Inoperative cruise control system.
2. Difficulty engaging or disengaging cruise control.
3. Cruise control functions not responding as expected.
4. Check Engine Light illuminated.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P0590.
1. Faulty brake pedal switch or clutch pedal switch.
2. Wiring or connector issues in the cruise control multi-function input “B” circuit.
3. Corroded or damaged terminals in the cruise control multi-function input “B” circuit connectors.
4. Mechanical issues preventing the brake pedal or clutch pedal from returning to their normal position.
Code Solutions P0590.
1. Inspect the brake pedal switch or clutch pedal switch for proper operation and replace if necessary.
2. Check the wiring and connectors in the cruise control multi-function input “B” circuit for damage or corrosion. Repair or replace any damaged wiring or connectors.
3. Thoroughly inspect the terminals in the cruise control multi-function input “B” circuit connectors for corrosion or damage. Clean or replace any affected terminals.
4. Ensure there are no mechanical issues preventing the brake pedal or clutch pedal from returning to their normal position. Lubricate or repair as needed.