Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that there's a problem with the cruise control system in your car. It's like when a button on a remote control gets stuck and doesn't work right. The car's computer is saying that a part of the cruise control isn't working because something is stuck.
The P0590 code is triggered when the powertrain control module (PCM) detects that the cruise control multi-function input B circuit is stuck in one position and not working correctly.
The cruise control system relies on several inputs and circuits to function properly. The 'Multi-Function Input B Circuit' is one of these inputs. When the PCM detects that this circuit is not changing states as expected (i.e., it appears 'stuck'), it logs the P0590 code. This could be due to a mechanical issue, electrical fault, or a problem with the cruise control switch itself.
• Cruise control not engaging
• Cruise control turning off unexpectedly
• Check Engine Light illuminated
• Unresponsive cruise control buttons
• Faulty cruise control switch
• Wiring issues in the cruise control circuit
• Defective PCM
• Stuck or damaged cruise control actuator
PCM: Powertrain Control Module
OBD-II: On-Board Diagnostics II
• Scan the vehicle for codes and note any other related codes.
• Inspect the cruise control switch for physical damage or sticking.
• Check the wiring and connectors for the cruise control circuit for damage or corrosion.
• Test the cruise control actuator for proper operation.
• Replace the faulty cruise control switch.
• Repair or replace damaged wiring or connectors.
• Replace the cruise control actuator if it is stuck or damaged.
• Reprogram or replace the PCM if necessary.
• OBD-II scanner
• Multimeter
• Screwdriver set
• Wiring repair kit
$150 - $500
Moderate
• Ford Focus
• Chevrolet Malibu
• Honda Accord
• Regularly inspect and clean cruise control switches.
• Ensure wiring and connectors are free from corrosion.
• Use the cruise control system regularly to prevent sticking.
Control System Issue
• Avoid using cruise control until the issue is fixed.
• Consult a professional mechanic for diagnosis and repair.
Check with your vehicle manufacturer for warranty coverage on cruise control components.
The P0590 code has been reported in various models with electronic cruise control systems, often due to mechanical wear or electrical faults.
Moderate – While the vehicle can still be driven, the cruise control system may not function properly, which can be inconvenient on long drives.
Driving with a malfunctioning cruise control system can lead to unexpected speed changes, which may be unsafe. Address the issue promptly.
• Vehicle at operating temperature
• Cruise control engaged
The cruise control switch is typically located on the steering wheel or steering column.
Q: Can I still drive my car with a P0590 code?
A: Yes, you can still drive your car, but the cruise control system may not work properly.
Q: Will fixing the P0590 code improve my car's performance?
A: Fixing the P0590 code will restore the functionality of the cruise control system, but it will not affect the overall performance of the vehicle.
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