Technical Description of OBD-II Trouble Code
Malfunction in Cruise Control On Signal
What does that signify?
This is a generic diagnostic trouble code (DTC) related to the powertrain and is commonly found in OBD-II vehicles equipped with cruise control. This includes vehicles from various manufacturers such as Peugeot, Ford, Nissan, Chevrolet, Hyundai, VW, Audi, Citroen, etc. While the code is generic, the specific repair steps may vary depending on the year, make, model, and powertrain configuration of the vehicle.
The cruise control system in a vehicle offers several functions. It allows the operator to set a specific speed, which can be automatically maintained using various sensors, switches, modules, and other components. Additionally, the speed can be electronically modified (e.g., “set -” and “resume +”), temporarily adjusted for passing vehicles or unexpected slowing, and more.
Most of the functions mentioned in the description of code P0565, as well as related codes (P0566, P0567, P0568, P0569, P0570, etc.), are contained within a single switch/component. Therefore, locating the mechanical inputs (e.g., buttons, switches, talks) involved should be relatively straightforward. Some common names for this component(s) include Multi-function switch, Steering wheel controls, Cruise control switch, Cruise control module, and Accessory switch.
In the case of this code, the Engine Control Module (ECM) has detected a malfunction within the signal circuit. In simple terms, something has gone wrong with the function mentioned in the description.
When the ECM detects a signal malfunction in one or more cruise control functions, it illuminates the Check Engine Light (CEL) with code P0565 and/or related codes. The use of the affected function(s) will most likely be disabled or behave abnormally.
Code P0565 is triggered when the ECM detects a signal malfunction in the ON signal of the “On/Off” circuit.
Here is an example of cruise control buttons on a steering wheel:
What is the severity of this DTC?
The severity of this DTC is considered moderately low. Even if the entire cruise control system loses functionality, it is still possible to safely drive the vehicle. However, neglecting any electrical issue for an extended period may lead to further damage, although this is a rare case.
What are some of the symptoms of the code?
Symptoms of a P0565 trouble code may include:
What are some of the common causes of the code?
The causes of the P0565 code may include:
What are some P0565 troubleshooting steps?
Basic Step #1
First, visually inspect the cruise control switch/module. Check for missing buttons, buttons stuck due to cola or other substances, loose buttons that do not make proper electrical connections, and any contamination that could damage the buttons. Also, make a note of all malfunctions or abnormalities in the cruise control functions.
Basic Step #2
Check if the cruise control light comes on in the instrument cluster when cruise control is manually activated. If not, verify if there is a fuse for the circuit and replace any blown fuses with new ones approved by the manufacturer. Refer to the vehicle’s service manual for fuse information.
Basic Step #3
To access the harness to the cruise control switch/module, you may need to remove certain dash parts such as the steering column shroud and airbag module in the steering wheel. Use a proper wiring harness for your specific vehicle to pinpoint the specific wire involved in the fault. Obtain accurate service information before performing any invasive procedures.
Basic Step #4
Ensure that the Anti-lock Braking System (ABS) is in good working order and that no ABS light is illuminated on the dashboard. Malfunctioning ABS sensors, including speed sensors, can trick the computers into incorrect speed readings.
