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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 131 (WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT VIEWS & COMPONENT CONNECTOR END VIEWS)COMPONENT CONNECTOR END VIEWSTRANSMISSION CONTROL MODULE (TCM), ENGINE SIDE
2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Transmission Control Module (TCM), Engine Side

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Transmission Control Module (TCM), Engine Side
WARNING: This page is about a different car, the 2008 Chevrolet Malibu Classic. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Transmission Control Module (TCM), Engine Side Connector End View
GM1372727Courtesy of GENERAL MOTORS CORP.
Transmission Control Module (TCM), Engine Side

Pin Wire Circuit Function
1 0.35 BN 418 Torque Converter Clutch Pulse Width Modulated (TCC PWM) Solenoid Valve Control
2 0.35 L-GN 1222 1-2 Shift Solenoid (SS) Valve Control
3 0.35 OG/BK 1230 Input Speed Sensor (ISS) High Signal
4-5 - - Not Used
6 0.35 TN 2501 High Speed GMLAN Serial Data Bus
7 0.35 TN/BK 2500 High Speed GMLAN Serial Data Bus
8 - - Not Used
9 0.35 YE 657 TCC Release Switch Signal
10 0.35 PU 5526 TAP Up/TAP Down Switch Signal
11 0.35 BN 4 Accessory Voltage
12-15 - - Not Used
16 0.35 PU 401 VSS Low Signal
17 0.35 L-BU/WH 1229 Pressure Control (PC) Solenoid Valve Low Control
18-19 - - Not Used
20 0.35 YE/BK 1223 2-3 Shift Solenoid Valve Control
21-22 - - Not Used
23 0.35 GY 773 Transmission Range Signal C
24-25 - - Not Used
26 0.35 D-BU/WH 1231 ISS Low Signal
27-28 - - Not Used
29 0.35 TN/WH 771 Transmission Range Signal A
30 0.35 TN 2762 Low Reference
31 0.35 PK 39 Ignition 1 Voltage
32 0.35 RD/WH 2040 Battery Positive Voltage
33 0.35 OG 1226 Transmission Fluid Pressure Switch Signal C
34 - - Not Used
35 0.35 YE/BK 1227 TFT Sensor Signal
36 - - Not Used
37 0.35 TN 2501 High Speed GMLAN Serial Data Bus
38 0.35 TN/BK 2500 High Speed GMLAN Serial Data Bus
39 0.35 WH 776 Transmission Range Signal P
40 0.35 OG/BK 1228 PC Solenoid Valve High Control
41 0.35 YE 400 VSS High Signal
42 0.35 WH 17 Stop Lamp Switch Signal
43 - - Not Used
44 0.35 D-BU 1225 Transmission Fluid Pressure Switch Signal B
45 - - Not Used
46 0.35 YE 772 Transmission Range Signal B
47-48 - - Not Used
49 0.35 BK/WH 451 Ground
Connector Part Information 
  • OEM: 13541751
  • Service: 88987979
  • Description: 49-Way F Micro-64 Series Sealed (BK)

Terminal Part Information 
  • Terminal/Tray: 15356826
  • Core/Insulation Crimp: C
  • Release Tool/Test Probe: See Terminal Repair Kit
RENDER: 1.0x

NO RELATED

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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.