Error Code P0566 is defined as Cruise Control Off Signal Malfunction. This code is a generic trouble code, meaning it applies to all cars equipped with OBD-II system, especially those cars made since 1996 up to present. It commonly applies but not limited to Audi, Chevrolet, Citroen, Ford, Hyundai, Peugeot, Volkswagen, etc. Specifications on the definition, troubleshooting, and repairs, of course, vary from one make and model to another.
Cruise Control comes with multiple functions; the driver can set a specific speed for your 2008 Saturn Vue and maintain it using numerous sensors, modules, switches, and various components, as well as modify the speed electronically (using “set –“ and “set +”), and even temporarily modify speed while storing previous speed (often used in passing cars, unexpected slowing or stopping), etc.
Since this code is contained within one switch/component, it is important to locate the mechanical inputs (buttons, switches, talks, etc.) involved. With that said, some common names for the said component are: Multi-function switch, Cruise control switch, Cruise control module, Steering wheel controls, Accessory switch, etc.
When the Error Code P0566 is stored, that means the PCM (powertrain control module, also known as ECM or engine control module in other 2008 Saturn Vue makes) has detected a malfunction within the signal circuit, specifically within the Off signal of the “On/Off” circuit.
Other related error codes include:
As with other error codes, this code activates the Check Engine light and registers the code to your 2008 Saturn Vue ’s memory system. Other common symptoms include:
First, check the cruise control switch/module, make sure the buttons and controls function properly. In many cases, buttons are missing, stuck in one position, or loose which is why it’s not making proper electrical connections. Dirt and particles that cause contamination can also lead to problems. Record all cruise control functions and their malfunctions or abnormalities.
If the cruise control light comes on in the instrument cluster when the cruise is manually activated, then it’s in good shape. If it does NOT, then verify if there’s a fuse. This information can be found in your 2008 Saturn Vue ’s service manual. Any blown fused must be replaced by a new and manufacturer-approved fuse.
Access the harness to the cruise control switch/module. In most cases, you would have to remove dash parts (steering column, steering wheel, airbag, etc.). To find the specific wire involved in the fault, you will need a proper wiring harness for your 2008 Saturn Vue . This can vary significantly given many reasons. Again, refer to your service manual before executing this step.
Make sure your ABS (anti-lock brake system) is in good shape, and there are no ABS light on your dash. ABS uses multiple sensors including speed sensors, which if it’s malfunctioning, could fool the computer into thinking your 2008 Saturn Vue is going faster or slower than the actual speed.
Severity for this code is considered low, as you can still use your 2008 Saturn Vue even when the cruise control system loses its function. If left unaddressed, however, this code can lead to further electrical damage to your 2008 Saturn Vue ’s electrical system.
The most common misdiagnosis for this code is not checking for blown fuses. Thus, it must be thoroughly checked before replacing any parts.