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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Automatic Transmission - 8L90 (M5U MQD) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P1840, P1841, P18B9, P18BE, or P18C3 >> Circuit/System Description

Circuit/System Description

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Circuit Description
9 V Reference Regulated voltage supplied by the control module.
Signal The control module input circuit has an internal resistance connected to 9 V.
Low Reference Grounded through the control module.
Component Description
B15 Transmission Internal Mode Switch The assembly contains individual switches.
K20 Engine Control Module The control module K20 uses the gear selector lever position sent by the control module K71 over serial data to determine park/neutral for engine starting.
K71 Transmission Control Module 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.
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