Technical Description of OBD-II Trouble Code
Malfunction in Cruise Control Accel Signal
What does that signify?
This is a generic diagnostic trouble code (DTC) for powertrain issues 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 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 P0570, as well as related codes like P0565, P0566, P0567, P0568, P0569, 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, Accessory switch, etc.
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 P0570 and/or related codes. The use of the affected function will most likely be disabled or behave abnormally.
Code P0570 is triggered when the ECM detects a signal malfunction in the ACCEL (accelerate) 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 P0570 trouble code may include:
What are some of the common causes of the code?
The causes of the P0570 code may include:
What are some troubleshooting steps for P0570?
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 potentially 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 the 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 will likely need to remove certain dash parts such as the steering column shroud and airbag module in the steering wheel. To pinpoint the specific wire involved in the fault, you will need a proper wiring harness for your vehicle. These harnesses can vary significantly, so always consult the appropriate service information before performing invasive actions.
Basic Step #4
Ensure that your 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.
