The P0591 trouble code indicates that there is a range or performance issue with the cruise control multi-function input “B” circuit. This means that the signal from the input source, such as the brake pedal switch or clutch pedal switch, is outside the expected range or is not performing within specified parameters. The cruise control system relies on accurate input signals to function properly, and any deviation from the expected range can affect its operation.
P0591 Cruise Control Multi-Function Input “B” Circuit Range/Performance
Code symptoms P0591.
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 P0591.
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 P0591.
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.