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HOMESERVICE MANUALSCHEVROLET2020EXPRESS 2500 LS, 2.8L ENG VIN 1REPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSWIRING DIAGRAMSCOMPONENT CONNECTOR END VIEWS (K71-Q77G)COMPONENT CONNECTOR END VIEWSK71 TRANSMISSION CONTROL MODULE
2020 Chevrolet Express 2500 LS, 2.8L Eng VIN 1

K71 Transmission Control Module

2020 Chevrolet Express 2500 LS, 2.8L Eng VIN 1SECTION K71 Transmission Control Module
GM3621452Courtesy of GENERAL MOTORS COMPANY
Connector Part Information
  • Harness Type: Engine
  • OEM Connector: 13965710
  • Service Connector: 19329822
  • Description: 66-Way F 0.64, 2.8 Series, Sealed (BK with BK Terminal Position Assurance)
Terminal Part Information

Terminal Type ID Terminated Lead Diagnostic Test Probe Terminal Removal Tool Service Terminal Tray Name Core Crimp Insulation Crimp
I 13579769 J-35616-35 (VT) J-38125-11A Not Required Not Required Not Required Not Required
II 19354746 J-35616-64B (LT BU) J-38125-213 Not Required Not Required Not Required Not Required
Pin Size Color Circuit Function Terminal Type ID Option
1 0.5 WH/D-BU 4507 Transmission Clutch H Control II -
2 0.5 D-BU/ 6401 Clutch Solenoid Valve B Control II -
3 0.5 GY/L-GN 6403 Clutch Solenoid Valve D Control II -
4 - 6 - - - Not Occupied - -
7 0.5 YE/L-GN 4170 Transmission Output Shaft Speed Sensor Circuit 9V Reference II -
8 0.5 YE/D-BU 4171 Transmission Input Shaft Speed Sensor Circuit 9V Reference II -
9 - 12 - - - Not Occupied - -
13 0.5 GN/VT 4510 Transmission Intermediate Speed Signal II -
14 0.5 GY/BU 6358 Output Speed Signal II -
15 0.5 L-GN/YE 6353 Input Speed Signal II -
16 - - - Not Occupied - -
17 0.5 WH 4508 Transmission Clutch G Control II -
18 0.5 BN 6400 Clutch Solenoid Valve A Control II -
19 0.5 GY 6402 Clutch Solenoid Valve C Control II -
20 0.5 YE/BN 6404 Clutch Solenoid Valve E Control II -
21 0.5 L-GN/WH 6380 Torque Converter Clutch Enable Solenoid Valve A Control II -
22 0.5 YE/BN 6210 Torque Converter Clutch Enable Solenoid Valve B Control II -
23 - 27 - - - Not Occupied - -
28 0.5 BK/BN 586 Transmission Fluid Temperature Sensor Low Reference II -
29 - 32 - - - Not Occupied - -
33 0.5 L-GN/GY 6387 Transmission High Side Driver 1 Control II -
34 - - - Not Occupied - -
35 0.5 VT/BK 2139 Run/Crank Ignition 1 Voltage 21 II -
36 - - - Not Occupied - -
37 0.5 BU 2500 High Speed GMLAN Serial Data [+] 1 II -
38 0.5 WH 2501 High Speed GMLAN Serial Data [-] 1 II -
39 - 48 - - - Not Occupied - -
49 0.75 GY/BN 6388 Transmission High Side Driver 2 Control II -
50 - - - Not Occupied - -
51 0.5 VT/YE 5985 Accessory Wake-Up Serial Data II -
52 - - - Not Occupied - -
53 0.5 BU 2500 High Speed GMLAN Serial Data [+] 1 II -
54 0.5 WH 2501 High Speed GMLAN Serial Data [-] 1 II -
55 - 62 - - - Not Occupied - -
63 0.5 BN/WH 585 Transmission Fluid Temperature Sensor Signal II -
64 0.5 D-BU/WH 3338 Transmission Internal Mode Switch Mode Control X II -
65 0.75 BK/WH 1551 Ground 15 I -
66 0.75 RD/L-GN 1840 Secondary Fused Battery Positive Voltage 18 I -
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.