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P0566 is a diagnostic trouble code (DTC) for "Cruise Control Off Signal Malfunction". 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. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
If the PCM detects a malfunction with the “Off” command in the cruise control system, the P0566 code is stored.
The PCM is part of the cruise control system, which automatically controls the speed when commanded. If there appears to be an issue with the cruise control function, the PCM will run a self-diagnostic test of the entire cruise control system. If an abnormal voltage reading appears in the circuit related to the “off” signal of the cruise control system, the PCM will store the P0566 code.
The most likely cause of this code is a failed cruise control switch, particularly caused by spilled liquids or debris build-up in the cruise control buttons.
Other causes may include:
When the P0566 code is stored, the cruise control will probably be inoperable, and the Check Engine Light will be illuminated. It may take up to three drive cycles before the Check Engine Light comes on.
After an OBD-II scanner detects the P0566 code, a technician should begin with a visual inspection of all the electrical components of the cruise control system, like wiring and connectors. Any damaged elements should be replaced, reconnected, or repaired as necessary. After this step, and any other attempted repair, the technician should clear the code from the PCM and retest the system, checking that the cruise control works as it should, and that the code does not reappear
If the code reappears, a faulty cruise control switch is the most likely malfunction. After replacing the switch, the mechanic should again clear the code and retest the system, to be sure the issue is resolved.
If the P0566 code is being detected, a vehicle will still be drivable. The cruise control may not be usable, but this should not affect any other function of the vehicle. If a fuse is blown, there may be some other minor electrical issues, which may lead to larger repairs in the future. While this code is stored in the PCM, the vehicle may not be able to pass the OBD-II emissions test.
There are many ways that a technician can address a P0566 code detection. They include:
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