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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 918 (ENGINE CONTROL SYSTEM & FUEL - 4.8L, 5.3L, 6.0L AND 6.2L - INTRODUCTION (2 OF 2))COMPONENT LOCATORENGINE CONTROL MODULE CONNECTORSENGINE CONTROL MODULE (ECM) C1
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Engine Control Module (ECM) C1

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Engine Control Module (ECM) C1
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Engine Control Module (ECM) C1 Connector End View
GM1715237Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) C1 Connector Parts Information

Connector Part Information 
  • OEM: 15499466
  • Service: 88988931
  • Description: 73-Way F Receptacle 0.64 Sealed (BK)
Terminal Part Information 
  • Pins: 73
  • Terminal/Tray: 7116-4152-02/9
  • Core/Insulation Crimp: A/5
  • Release Tool/Test Probe: 12094430/J-35616-4A (PU)
  • Pins: 1, 12-13, 16-17, 23-24, 29-36, 50-52, 56-59, 63, 68, 70-71
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 2, 9-11, 18-20, 27-28, 37-38, 41, 47, 49, 61, 64-65, 69
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: J/J
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
Engine Control Module (ECM) C1 Connector Terminal Identification

Pin Wire Color Circuit No. Function
1 OG/BK 1786 Park/Neutral Signal
2 GY/BK 1694 4WD Low Signal
3-8 - - Not Used
9 L-BU/WH 6311 Brake Switch Signal
10 PU/WH 1668 HO2S High Signal - Bank 1 Sensor 2
11 TN/WH 1669 HO2S Low Signal - Bank 1 Sensor 2
12 OG/BK 380 A/C Refrigerant Pressure Sensor Signal
13 TN 5514 Low Reference
14-15 - - Not Used
16 PU 1589 Fuel Level Sensor Signal - Primary
17 D-BU/WH 473 High Speed Cooling Fan Relay Control
18 D-BU 5985 Accessory Wakeup Serial Data
19 PK 439 Ignition 1 Voltage
20 RD/WH 440 Battery Positive Voltage
21-22 - - Not Used
23 PU 1272 Low Reference
24 D-GN 890 Fuel Tank Pressure Sensor Signal
25-26 - - Not Used
27 TN 2501 High Speed GMLAN Serial Data Bus -
28 TN/BK 2500 High Speed GMLAN Serial Data Bus +
29 D-BU 1161 APP Sensor 1 Signal
30 BN 1271 Low Reference
31 TN/BK 6049 Low Reference
32 L-BU 1162 APP Sensor 2 Signal
33 GY 2709 5-Volt Reference
34 GY/WH 2700 5-Volt Reference
35 - - Not Used
36 TN 1274 5-Volt Reference
37 TN/BK 472 IAT Sensor Signal
38 TN 2760 Low Reference
39-40 - - Not Used
41 YE 492 MAF Sensor Signal
42-46 - - Not Used
47 PK/BK 1339 Ignition 1 Voltage
48 - - Not Used
49 TN 1671 HO2S Low Signal - Bank 2 Sensor 2
50 D-GN/WH 465 Fuel Pump Relay Control - Primary
51 TN 1465 Fuel Pump Relay Control - Secondary (Except NQZ)
52 YE/BK 625 Starter Enable Relay Control
53-55 - - Not Used
56 WH/BK 1164 5-Volt Reference
57 YE/BK 1827 Vehicle Speed Signal
58 D-GN 335 Low Speed Cooling Fan Relay Control
59 YE 5991 Powertrain Relay Coil Control
60 - - Not Used
61 WH 1310 EVAP Canister Vent Solenoid Control
62 - - Not Used
63 D-GN/WH 459 A/C Compressor Clutch Relay Control
64 OG/WH 3223 HO2S Heater Low Control (Bank 2 Sensor 2)
65 GY/WH 3122 HO2S Heater Low Control - Bank 2 Sensor 1
66-67 - - Not Used
68 BN/WH 419 MIL Control
69 PU 1670 HO2S High Signal - Bank 2 Sensor 2
70 L-BU 1937 Secondary Fuel Level Sensor Signal
71 OG/BK 6399 Replicated TOS Signal
72 - - Not Used
73 BK/WH 451 Ground
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.