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HOMESERVICE MANUALSPONTIAC2008GRAND PRIX BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 417 (COMPONENT LOCATIONS & COMPONENT CONNECTOR END VIEWS)COMPONENT CONNECTOR END VIEWSTRANSMISSION CONTROL MODULE (TCM) (LY7)
2008 Pontiac Grand Prix Base

Transmission Control Module (TCM) (LY7)

2008 Pontiac Grand Prix BaseSECTION Transmission Control Module (TCM) (LY7)
WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Transmission Control Module (TCM) (LY7) Connector End View
GM1372727Courtesy of GENERAL MOTORS CORP.
Transmission Control Module (TCM) (LY7)

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 RD/BK 1230 Input Speed Sensor (ISS) High Signal
4-5 - - Not Used
6 0.35 D-GN 2362 High Speed GMLAN Serial Data Bus - (CAN)
7 0.35 YE 2361 High Speed GMLAN Serial Data Bus
8 - - Not Used
9 0.35 WH 1804 TCC Release Switch Signal
10 - - Not Used
11 0.35 BN 1141 Ignition 3 Voltage
12-15 - - Not Used
16 0.35 PU 401 Output Speed Sensor (OSS) 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 SS 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 BK/WH 771 Transmission Range Signal A
30 0.35 BK 2762 Transmission Fluid Temperature (TFT) Sensor Low Reference
31 0.35 PK 1339 Ignition 1 Voltage
32 0.5 OG 1640 Battery Positive Voltage
33-34 - - Not Used
35 0.35 YE/BK 1227 TFT Sensor Signal
36 - - Not Used
37 0.5 L-BU 6106 High Speed GMLAN Serial Data Bus
38 0.5 D-BU 6105 High Speed GMLAN Serial Data Bus
39 0.35 WH 776 Transmission Range Signal P
40 0.35 RD/BK 1228 PC Solenoid Valve High Control
41 0.35 YE 400 VSS High Signal
42 0.35 WH 17 Stop Lamp Switch Signal
43-45 - - Not Used
46 0.35 YE 772 Transmission Range Signal B
47-48 - - Not Used
49 3 BK/WH 1451 Ground
Connector Part Information 
  • OEM: 15476993
  • Service: 88987979
  • Description: 49-Way F Micro-64 GT 280 Series Sealed (BK)
Terminal Part Information 
  • Terminal/Tray: 15356826
  • Core/Insulation Crimp: C
  • Release Tool/Test Probe: See Terminal Repair Kit
RENDER: 1.0x

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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.