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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSELECTRICAL COMPONENT LOCATIONSCOMPONENT LOCATIONS & COMPONENT CONNECTOR END VIEWSCOMPONENT CONNECTOR END VIEWENGINE 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)
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 X
11 0.8 TN/WH 1669 Heated Oxygen Sensor (HO2S) Low Signal - Bank 1 Sensor X
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
32 0.35 L-BU 1162 Accelerator Pedal Position (APP) Sensor 2 Signal
33 0.5 GY 2709 5-Volt Reference
34 0.35 GY 2700 5-Volt Reference (C60)
35 - - Not Used
36 0.35 TN 1274 5-Volt Reference
37 0.5 TN 472 Intake Air Temperature (IAT) Sensor Signal
38 0.5 TN 470 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
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 2 Sensor 1
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 (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

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.