Circuit/System Description
WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
| Circuit |
Description |
| Signal |
Regulated voltage supplied by the control module. - K20 Engine Control Module |
| Ground |
Supplied by a control module. - K71 Transmission Control Module |
| Component |
Description |
| B15 Transmission Internal Mode Switch |
The switch has 5 contacts which close in a specific sequence depending on the position of the selector lever. An additional contact generates a P/N signal for the engine control module. |
| K71 Transmission Control Module |
The control module contains a microprocessor used to process input data to control outputs. The control module receives information from a variety of sensors, switches and serial data information from other control modules. This information is used to control a combination of solenoid valves to obtain the correct line pressure, gear ratio and torque converter clutch operation. |
| 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. |