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Home >> Chevrolet >> 2017 >> Bolt EV Premier >> Repair and Diagnosis >> Brakes >> Traction Control >> Antilock Brake System >> Diagnostic Information and Procedures >> DTC P0856: Traction Control Torque Request Circuit >> Circuit/System Description

Circuit/System Description

For an overview of the component/system, refer to:ABS Description and Operation 

Circuit Description
B+ - Terminal 1 The output circuit is switched from ground to 12 V to activate the component.
Low Reference Grounded through the control module.
Component Description
K20 Engine Control Module The control module contains a microprocessor used to process input data to control outputs.
The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensors, interprets the data and adjusts the engine actuators accordingly.
K17 Electronic Brake Control Module The control module K17 can increase and decrease the brake pressure on all 4 wheels individually in order to fulfill these functions:
  • Antilock Braking
  • Traction Control
  • Vehicle Stability Control

The control module K17 can also influence the following control modules to limit the amount of produced torque:
  • K20 Engine Control Module
  • K71 Transmission Control Module