Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. P0590 OBD-II Trouble Code: Cruise Control Multi-Function Input “B” Circuit Stuck

P0590 OBD-II Trouble Code: Cruise Control Multi-Function Input “B” Circuit Stuck

check engine light P0590 OBD-II Trouble Code: Cruise Control Multi-Function Input “B” Circuit Stuck

P0590 code definition

The P0590 trouble code notes an electrical issue with the cruise control multi-function input “B” circuit.

What the P0590 code means

The P0590 code is a generic OBD-II trouble code that detects a problem with the cruise control multi-function input in the “B” area of the circuit. The “B” refers to a general area of the circuit, rather than any specific component. The cruise control module works in tandem with the powertrain control module (PCM) to help control and regulate the vehicle’s speed automatically when the cruise control system is engaged. If the PCM notes that the speed of the vehicle cannot be contained, then the entire cruise control system will be tested. If voltage/resistance levels are noted by the PCM to be outside of their standard range, then the P0590 code will be triggered.

What causes the P0590 code?

The P0590 trouble code is usually the result of a malfunctioning cruise control switch. The cruise control switch can malfunction due to the circuity failing, which can happen when liquids are spilled on the cruise control buttons. The P0590 code can also be the result of defective electrical components, such as damaged or loose wires, or corroded and damaged connectors.

What are the symptoms of the P0590 code?

The P0590 code is usually accompanied by the check engine soon Warning Light illuminating on the dashboard, though this isn’t the case in all vehicles. When the code is detected, the cruise control system will most likely not work. It is also common for blown fuses to occur.

How does a mechanic diagnose the P0590 code?

The P0590 code will be diagnosed using a standard OBD-II trouble code scanner. A trained technician will use the scanner to look at the freeze frame data and assess the P0590 code. The technician will also look for additional trouble codes that may be present. The codes should then be reset, and the vehicle restarted. If the code does not return upon restart, then it was likely triggered incorrectly, or is an erroneous error.

If the P0590 code persists, then the mechanic should visually inspect all of the electrical components in the cruise control circuit. Any blown fuses, short wires, or loose connectors should be replaced, as should any damaged components. It’s important for technicians to be extremely thorough when searching for blown fuses.

Next, the cruise control switch should be checked. The mechanic can either inspect the switch manually, or reset the PCM and try the cruise control system again. If the problem persists, it should be assumed that the cruise control switch is the issue.

Following any replacements, the mechanic should reset the trouble codes and restart the vehicle to see if the P0590 code remains. That way the mechanic can tell as soon as the code has been eliminated and the issue is resolved.

Common mistakes when diagnosing the P0590 code

The most common mistake that is made when diagnosing the P0590 code comes from failing to properly follow the OBD-II trouble code protocol. The protocol should always be adhered to, step by step, to make sure that all repairs are efficient, and don’t feature erroneous replacements. It is common for entire components to be unnecessarily replaced when blown fuses are the actual issue.

How serious is the P0590 code?

The P0590 trouble code won’t keep a vehicle from being drivable. However, the trouble code will likely keep the cruise control system from functioning, so it should be repaired as soon as possible.

What repairs can fix the P0590 code?

The most common repairs for the P0590 trouble code are:

Additional comments for consideration regarding the P0590 code

In some vehicles, the cruise control multi-function input “B” circuit issue will have to occur three separate times before the P0590 code is triggered.

Need help with a P0590 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...
Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...


Related questions

Q: I need to know what the trouble code P19DA means

Hi there. The code P19DA means that the fuel pump is not sending a signal back to the PCM. This is usually caused by a burned motor in the fuel pump or a burned meter wire in the fuel pump...

Q: 2008 Kia Sedona, 3.8L V-6, transverse : check engine light constant on; occasional random misfire(P0300) with P2198

If you are getting random misfire codes and O2 sensor codes after getting fuel i suggest you have a fuel sample test to see if there is excessive water in the fuel. You can try adding some drygas in the...

Q: 1999 Nissan Altima won't stay running. I changed the thermostat.

First of all, it isn't possible to tell you exactly what is wrong with your car without direct testing, in other words, diagnosing it. If the thermostat made the car run at the proper temperature, then that is not likely...