Error Code P0581 is defined as Cruise Control Multi-Function Input “A” Circuit High. This code is a generic trouble code that typically applies to cars equipped with the OBD-II system. It’s particularly common among Alfa Romeo, Chevrolet, Chrysler, Ford, Dodge, Jeep, Land Rover, Mazda, Nissan, etc. Specifications on the definition, troubleshooting, and steps for repairs, of course, vary depending on the make, year, model, and powertrain configuration of your 2007 Ford Freestar .
Cruise control is a feature that provides comfort and convenience to your 2007 Ford Freestar riders. Its purpose is to keep your 2007 Ford Freestar at a specific speed, which is set by the driver manually (through steering wheel buttons, multifunction (i.e., signal lights, cruise, wipers, etc.) switch mounted on the steering wheel column, etc.)
If your 2007 Ford Freestar is equipped with the A/T (automatic transmission) however, the driver no longer has to control the gas pedal. It can also control and adjust shift points depending on the demands of the driver’s real-time driving condition.
Generally, this code refers to the multifunction switch of the steering column. With that said, location varies from one make and model to another. Thus it’s important to check thoroughly. The cruise control button is the best place to start and narrow your search. This code usually refers to a specific input circuit within the cruise control system. Thus, make sure you check with the service manual to determine which wire/circuit to focus on and test.
Error Code P0581 happens when the PCM (powertrain control module, also known as ECM in other 2007 Ford Freestar makes) has detected that a high electrical value within the “A” cruise control multi-function input circuit.
Other related error codes include:
As with other error codes, this code activates the Check Engine light and registers the code to your 2007 Ford Freestar ’s memory system. Other common symptoms include:
In most cases, this code is caused by a defective or damaged cruise control switch, specifically is there is liquid spilled on the cruise control button, or there’s a dust debris buildup on the button. Other possible causes include:
Check for any kind of contamination as soon as you have located your 2007 Ford Freestar ’s multi-function/cruise control switch. It is quite easy for plastic buttons to get dirty, greasy, and sticking, causing it to malfunction and work abnormally. Make sure the switch’s mechanical operation is smooth and seamless. Any problem must be addressed as soon as possible. If your scan tool/OBD reader has the capabilities, feel free to check via the DATA STREAM (mode name varies between readers) to check the real-time data.
Tip: Never spray cleaning solutions directly to the button. Rather, dampen a cleaning rag lightly using water, or mixture of soap and water, a dash cleaner, etc., and then carefully remove dirt debris through the crevices of the switch. You can also use an air-powered blow gun to remove dirt.
Get access to the connector and harness within the cruise control/multi-function switch input circuit. For some cars, you may have to remove some shrouds or dash plastic. Be extra careful when working with this plastic. Work at comfortable room temperature with disassembling or assembling the plastic dash/interior.
If you can access the connector now, you can check with the specific troubleshooting steps from your service manual. The switch test is a typical scenario to record electrical valve using your multimeter. This may include operating the switch while recording and static testing. Again, refer to the specific make and model of the service manual for the proper “diagnostic flow chart.”
PCM problem is usually the last resort for diagnosis of this code, and it is also the most expensive. Thus, you’re better off to leave it with the professionals.
Depending on the diagnosis, common repairs for this code include:
This code doesn’t really pose a serious problem or safety hazards, as it can only affect the cruise control feature of your 2007 Ford Freestar . However, if part of the problem is a blown fuse, then it may be a sign of a more serious issue that may lead to safety hazards when driving, such as rending turn signal lights inoperable. If this is the case, then the code must be addressed as soon as possible.
The most common misdiagnosis for this code is replacing parts that are not faulty, and not checking for blown fuses. If there’s a blown fuse problem, then the newly replaced part will likely fail again.