Technical Description of OBD-II Trouble Code
Malfunction in Cruise Control Coast Signal
What does that signify?
This is a generic diagnostic trouble code (DTC) for powertrain and is commonly found in OBD-II vehicles with cruise control. This can include 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.
Cruise control in a vehicle offers several functions. It allows the operator to set a specific speed, which is then 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/stopping, and more.
Since most of the functions mentioned in the description of code P0569 and related codes (P0565, P0566, P0567, P0568, P0570, etc.) are contained within a single switch/component, it should be relatively easy to locate the mechanical inputs (e.g. buttons, switches, talks) involved. 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 went 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 P0569 or related codes. In most cases, the use of the affected function(s) will be disabled or behave abnormally.
Code P0569 is triggered when the ECM detects a signal malfunction in the COAST signal of the cruise control system.
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 of time may lead to further damage, although this is a rare case.
What are some of the symptoms of the code?
Symptoms of a P0569 trouble code may include:
What are some of the common causes of the code?
Causes for this P0569 code may include:
What are some P0569 troubleshooting steps?
Basic Step #1
Start by visually inspecting 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 in the instrument cluster comes on 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. Always consult the appropriate service information before performing 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. The ABS system uses various sensors, including speed sensors, which, if malfunctioning, could cause the vehicle’s computers to incorrectly perceive the speed.
