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HOMESERVICE MANUALSCHEVROLET2025TRAILBLAZER ACTIV, FWDREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSWIRING DIAGRAMSCOMPONENT CONNECTOR END VIEWS (K71-M81)COMPONENT CONNECTOR END VIEWSK71 TRANSMISSION CONTROL MODULE (M3F)
2025 Chevrolet Trailblazer ACTIV, FWD

K71 Transmission Control Module (M3F)

2025 Chevrolet Trailblazer ACTIV, FWDSECTION K71 Transmission Control Module (M3F)
GM4024881Courtesy of GENERAL MOTORS COMPANY
Connector Part Information
  • Harness Type: Engine Wiring Harness
  • OEM Connector: 34822-0483
  • Service Connector: 19330900
  • 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
I 13587518 J-35616-35 (VT) J-38125-11A
II 19351723 J-35616-64B (L-BU) J-38125-213
Pin Size Color Circuit Function Terminal Type ID Option
1 0.5 WH / BU 4507 Transmission Clutch H Control II M3F
2 0.5 VT / WH 422 Torque Converter Clutch Solenoid Valve Control II M3F
3 0.5 GY / GN 6403 Clutch Solenoid Valve D Control II M3F
4 0.5 VT 4509 Transmission Clutch F Control II M3F
5 - 6 - - - Not Occupied - -
7 0.5 YE / GN 4170 Transmission Output Shaft Speed Sensor Circuit 9V Reference II M3F
8 0.5 YE / BU 4171 Transmission Input Shaft Speed Sensor Circuit 9V Reference II M3F
9 - 12 - - - Not Occupied - -
13 0.5 GN / VT 4510 Transmission Intermediate Speed Signal II M3F
14 0.5 GY / BU 6358 Output Speed Signal II M3F
15 0.5 GN / YE 6353 Input Speed Signal II M3F
16 - - - Not Occupied - -
17 0.5 WH 4508 Transmission Clutch G Control II M3F
18 0.5 BN 6400 Clutch Solenoid Valve A Control II M3F
19 0.5 GY 6402 Clutch Solenoid Valve C Control II M3F
20 0.5 YE / BN 6404 Clutch Solenoid Valve E Control II M3F
21 0.5 GY / BK 5501 TCC/Clutch Select Solenoid Valve Control II M3F
22 - - - Not Occupied - -
23 0.5 WH 1971 Transmission Oil Level Sensor Signal II M3F
24 0.5 WH / GY 4578 Surge Accumulator Solenoid Valve Low Side Control II M3F
25 - 27 - - - Not Occupied - -
28 0.5 BK / BN 586 Transmission Fluid Temperature Sensor Low Reference II M3F
29 - 32 - - - Not Occupied - -
33 0.5 GN / GY 6387 Transmission High Side Driver 1 Control II M3F
34 - - - Not Occupied - -
35 0.5 VT / GY 139 Run/Crank Ignition 1 Voltage II M3F+L3T
36 - - - Not Occupied - -
37 0.5 BU 2500 High Speed GMLAN Serial Data [+] 1 II M3F+L3T
38 0.5 WH 2501 High Speed GMLAN Serial Data [-] 1 II M3F+L3T
39 - 48 - - - Not Occupied - -
49 0.5 GY / BN 6388 Transmission High Side Driver 2 Control II M3F
50 - - - Not Occupied - -
51 0.5 VT / YE 5985 Accessory Wake-Up Serial Data II M3F+L3T
52 - - - Not Occupied - -
53 0.5 BU 2500 High Speed GMLAN Serial Data [+] 1 II M3F
54 0.5 WH 2501 High Speed GMLAN Serial Data [-] 1 II M3F
55 - 62 - - - Not Occupied - -
63 0.5 BN / WH 585 Transmission Fluid Temperature Sensor Signal II M3F
64 0.5 BU / WH 3338 Transmission Internal Mode Switch Mode Control X II M3F
65 1.5 BK / WH 251 Signal Ground I M3F+L3T
66 1.5 RD / YE 240 Battery Positive Voltage I M3F
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.