Error Code P0857 is defined as Traction Control Input Signal Range/Performance. It is a generic trouble code, meaning it applies to all cars with the OBD-II system, especially those made from 1996 up to the present. This code only applies to cars equipped with an electronic traction control system. Specifications on the definition, troubleshooting, and repairs vary from one make, model, and powertrain configuration.
This code refers to a malfunction in the traction control input signal circuit. The powertrain control module (PCM) is often registered but can also be detected by other control modules related to the traction circuit.
The job of the traction control input signal circuit is that it relays information to system-related control modules. This promotes cooperation between engine performance and traction control. This problem occurs when one of the control modules has failed to receive a message from the traction control input signal circuit.
As with other error codes, the Check Engine Light is activated with this code. Other common symptoms include:
The most common cause of this code is a faulty On/Off traction control system switch. This could result from liquid contact damage with the module or one of the other related components. Other common causes include:
The code must be identified via the OBD2 code reader connected to your 2017 Volkswagen Beetle convertible’s computer.
Next, the traction control switches must be checked first, as this is the most common cause of the trouble code.
If you suspect the problem is in the traction-related control modules, you may need a special scanned such as Autohex. This scanner will save you time from inspecting all of the related control modules.
Next, inspect all the wirings and connectors related to the traction control circuit. Look for signs of corrosion, damages, and disconnected wires.
Also, make sure you check all other related components to the traction circuit.
If the problem is caused by a damaged or faulty traction control switch, it must be replaced. Other common repairs include:
Voltage readings must always be compared with the specifications set by the manufacturer. Also, your 2017 Volkswagen Beetle convertible must be taken to a test drive following a thorough diagnosis and repairs.
The severity of this error code depends on its symptoms. In mild cases, the drivability of your 2017 Volkswagen Beetle convertible will be affected. For more severe problems, your 2017 Volkswagen Beetle convertible’s inability to shift gears will render it inoperable. Either way, this code must be addressed as soon as possible, as it poses safety problems.