P0581 OBD-II Trouble Code: Cruise Control Multi-Function Input "A" Circuit High

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Cost of diagnosing the P0581 code

P0581 is a diagnostic trouble code (DTC) for "Cruise Control Multi-Function Input "A" Circuit High". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
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Toyota$70.00$30.00
BMW$70.00$30.00
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Check Engine Light

P0581 code definition

The P0581 code indicates that the PCM has detected a malfunction in the electrical components of the cruise control multi-function input circuit.

What the P0581 code means

In order to assist the cruise control module in controlling vehicle speed, the PCM monitors the performance of all cruise control components. If the PCM detects that the cruise control multi-function circuit is providing an abnormal voltage reading (as opposed to the manufacturer’s specifications for the current drive conditions), it will store the P0581 code.

What causes the P0581 code?

In most cases, a faulty cruse control switch is the problem behind the P0581 code. This switch can fail due to shorted or open circuitry, particularly in the cruise control buttons if water, liquid, or dirt has been spilled onto the buttons. Other causes may include:

  • Open, shorted, or otherwise damaged electrical components, such as wiring, connectors, and harnesses
  • Blown fuses, which may indicate a larger issue

What are the symptoms of the P0581 code?

In addition to the illuminated Check Engine lamp, this code is usually accompanied by an inability to use the cruise control. Blown fuses may be a cause or a symptom, depending on the exact nature of the issue causing the P0581 code.

How does a mechanic diagnose the P0581 code?

After verifying the code with an OBD-II scanner, it is important to inspect all electrical components, and perform any repairs that are necessary on the wiring, connectors, or harnesses. Afterwards, clearing the code from the PCM, and performing a retest, will let the technician know if this has resolved the issue. If the code reappears in the PCM, the next step is to replace the cruise control switch. If the code reappears after this repair, the mechanic may need to disconnect the cruise control switch, and manually test the voltage reading to find the source of the problem.

Common mistakes when diagnosing the P0581 code

The most common misdiagnosis with the P0581 code, is replacing components that were or were not faulty, without checking for blown fuses. If a fuse is blown, a replacement part will likely fail again quickly.

How serious is the P0581 code?

While the cruise control may not be usable, but this should not affect any other function of the vehicle; therefore, the P0581 code is only a mild repair issue. However, if a fuse is blown, there may be some other minor electrical issues, such as the inability to use the turn signal, which could cause unsafe driving conditions; in this case, the P0581 code would be considered a more serious repair issue.

What repairs can fix the P0581 code?

There are many ways that a technician can address a P0581 code detection. They include:

  • Replacing a faulty cruise control switch
  • Replacing damaged cruise control buttons to ensure a replacement switch does not become damaged
  • Repairing open, shorted, or otherwise damaged electrical components, such as wiring, connectors, and harnesses
  • Replacing blown fuses

Additional comments for consideration regarding the P0581 code

An unresolved P0581 code that is still stored in the PCM means that the vehicle may not be able to pass an emissions test.

Need help with a P0581 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.

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Manuel

29 years of experience
162 reviews
Manuel
29 years of experience
Very friendly and knowledgable. Was able to diagnose my car issues very quickly.
2004 JEEP GRAND CHEROKEE - CHECK ENGINE LIGHT IS ON - TUSTIN, CALIFORNIA

Jerome

21 years of experience
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Jerome
21 years of experience
Jerome is a very knowledgeable mechanic. He was polite and helpful. When he first arrived, I was very irritated because my appointment was for 4:00 but he didn't get there until around 8:00. He explained that his previous appointment was a repair and then he had to travel to my location.Upon arrival, Jerome made some suggestions that would help with elimimating unnecessary and costly repairs. I would suggest that appointments are scheduled based on the mechanic's need to have enough time to complete the previous appointment and travel time to the next appointment. This will help with providing the service(s) closer to the appointment time. Thank you, Jerome.
2003 HONDA ACCORD - CHECK ENGINE LIGHT IS ON - BALTIMORE, MARYLAND

Christopher

17 years of experience
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Christopher
17 years of experience
Christopher was wonderful! He had the knowledge and experience to quickly and accurately diagnose the issue with my car. He arrived 30min. early and went above and beyond by looking for a cheaper price for the part I needed for my car. I can't wait to work with Christopher again on future vehicles.
2003 HONDA CIVIC - CHECK ENGINE LIGHT IS ON - TAMPA, FLORIDA

Emmette

33 years of experience
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Emmette
33 years of experience
Emmette, was on time and performed service. He was professional and prompt giving me quality service. Overall I was satisfied with his experience observation and service work for my vehicle.
2009 DODGE CHARGER - CHECK ENGINE LIGHT IS ON - LORTON, VIRGINIA

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