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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1860 (WIRING SYSTEMS AND POWER MANAGEMENT - ELECTRICAL CENTER IDENTIFICATION, COMPONENT CONNECTOR & SPLICE PACK CONNECTOR END VIEWS)COMPONENT CONNECTOR END VIEWSENGINE CONTROL MODULE (ECM) X1 (4.8L/5.3L/6.0L)
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Engine Control Module (ECM) X1 (4.8L/5.3L/6.0L)

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Engine Control Module (ECM) X1 (4.8L/5.3L/6.0L)
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2009 GMC Savana Special, 2009 GMC Savana Camper Special, 2009 GMC Savana, 2009 Chevrolet RV Cutaway, and 2009 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Engine Control Module (ECM) X1 (4.8L/5.3L/6.0L) - Connector End View
GM1673472Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X1 (4.8L/5.3L/6.0L)

Pin Wire Circuit Function
1 0.35 OG/BK 1786 Ignition Lock Cylinder Control Actuator Signal
2-8 - - Not Used
9 0.5 L-BU/WH 6311 Torque Converter Clutch (TCC) Brake Signal
10 0.8 PU/WH 1668 Heated Oxygen Sensor (HO2S) High Signal - Bank 1 Sensor 2
11 0.8 TN/WH 1669 Heated Oxygen Sensor (HO2S) Low Signal - Bank 1 Sensor 2
12 0.35 OG/BK 380 A/C Refrigerant Pressure Sensor Signal (C60)
13 0.35 TN 5514 Low Reference (C60)
14-15 - - Not Used
16 0.5 PU 1589 Fuel Level Sensor Signal - Primary
17 - - Not Used
18 0.5 D-BU 5985 Accessory Wakeup Serial Data
19 0.5 PK 439 Ignition Voltage
20 0.5 RD/WH 440 Battery Positive Voltage
21-22 - - Not Used
23 0.35 PU 1272 Low Reference
24 0.5 D-GN 890 Fuel Tank Pressure Sensor Signal
25-26 - - Not Used
27 0.5 TN 2501 High Speed GMLAN Serial Data Bus (-)
28 0.5 TN/BK 2500 High Speed GMLAN Serial Data Bus (+)
29 0.35 D-BU 1161 Accelerator Pedal Position (APP) Sensor 1 Signal
30 0.35 BN 1271 Low Reference
31 0.5 TN 2759 Low Reference (4.8L/6.0L)
0.5 TN/BK 6049 Low Reference (5.3L)
32 0.35 L-BU 1162 Accelerator Pedal Position (APP) Sensor 2 Signal
33 0.5 GY 2709 5-Volt Reference 1
34 0.35 GY 2700 5-Volt Reference 1 (C60)
35 - - Not Used
36 0.35 TN 1274 5-Volt Reference 1
37 0.5 TN 472 Intake Air Temperature (IAT) Sensor Signal
38 0.5 TN 2760 Low Reference
39-40 - - Not Used
41 0.5 YE 492 Mass Air Flow (MAF) Sensor Signal
42-46 - - Not Used
47 0.5 PK 1339 Ignition Voltage
48 - - Not Used
49 0.8 TN 1671 Heated Oxygen Sensor (HO2S) Low Signal - Bank 2 Sensor 2
50 0.35 D-GN/WH 465 Fuel Pump Relay Control - Primary
51 - - Not Used
52 0.35 YE/BK 625 Starter Enable Relay Control
53-55 - - Not Used
56 0.35 WH/BK 1164 5-Volt Reference 2
57 0.35 YE/BK 1827 Vehicle Speed Signal
58 - - Not Used
59 0.5 YE 5991 Powertrain Relay Control
60 - - Not Used
61 0.5 WH 1310 Evaporative Emission (EVAP) Canister Vent Solenoid Control
62 - - Not Used
63 0.35 D-GN/WH 459 A/C Compressor Clutch Relay Control (C60)
64 0.8 OG/WH 3223 Heated Oxygen Sensor (HO2S) Heater Low Control - Bank 2 Sensor 2
65 0.8 GY/WH 3122 Heated Oxygen Sensor (HO2S) Heater Low Control - Bank 1 Sensor 2
66-67 - - Not Used
68 0.35 BN/WH 419 MIL Control
69 0.8 PU 1670 Heated Oxygen Sensor (HO2S) High Signal - Bank 2 Sensor 2
70 - - Not Used
71 0.5 OG/BK 6399 Replicated TOS Signal
72 - - Not Used
73 3 BK/WH 1551 Ground
Connector Part Information 
  • OEM: 13580802
  • Service: See Catalog
  • Description: 73-Way F MX123 34566 Series Sealed (BK)
Terminal Part Information 
  • Pins: 73
  • Terminal/Tray: 7116-4152-02/9
  • Core/Insulation Crimp: A/5
  • Release Tool/Test Probe: 12094430/J-35616-35 (VT)
  • Pins: 1, 12, 13, 23, 29, 30, 32, 34, 36, 50, 52, 56, 57, 63, 68
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 9, 16, 18-20, 24, 27, 28, 31, 33, 37, 38, 41, 47, 59, 61, 71, 10, 11, 49, 64, 65, 69
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: Pins 9, 16, 18-20, 24, 27, 28, 31, 33, 37, 38, 41, 47, 59, 61, 71 - J/J
  • Core/Insulation Crimp: Pins 10, 11, 49, 64, 65, 69 - K/K
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
RENDER: 1.0x

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

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  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
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