Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2014EXPRESS 2500 BASE, VAN CARGO EXTENDED, 6.0L ENG VIN GREPAIR AND DIAGNOSISELECTRICALWIRING DIAGRAMSWIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - K17 (EXCEPT JL4) TO K9 (X1)COMPONENT CONNECTOR END VIEWSK20 ENGINE CONTROL MODULE (ECM) X1 & X2K20 ENGINE CONTROL MODULE X1 (LU3)
2014 Chevrolet Express 2500 Base, Van Cargo Extended, 6.0L Eng VIN G
K20 Engine Control Module X1 (LU3)
2014 Chevrolet Express 2500 Base, Van Cargo Extended, 6.0L Eng VIN GSECTION K20 Engine Control Module X1 (LU3)
Connector Part Information
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Terminal Part Information
| Terminal Type ID | Terminated Lead | Diagnostic Test Probe | Terminal Removal Tool | Service Terminal | Tray | Core Crimp | Insulation Crimp |
|---|---|---|---|---|---|---|---|
| I | Pins: 1, 6, 8, 18, 21, 25, 27, 30, 32, 41, 47, 50, 57, 65, 67 - 13575811 | J-35616-64B (L-BU) | J-38125-213 | Pins: 1, 6, 8, 18, 21, 25, 27, 30, 32, 41, 47, 50, 57, 65, 67 - 33467-0003 | 23 | Pins: 1, 6, 8, 18, 21, 25, 27, 30, 32, 41, 47, 50, 57, 65, 67 - H | H |
| II | Service by Harness - See Part Catalog | J-35616-35 (VT) | J-38125-12A | 1326030-8 | 17 | A | 4 |
K20 Engine Control Module X1 (LU3)
| Pin | Size | Color | Circuit | Function | Terminal Type ID | Option |
|---|---|---|---|---|---|---|
| 1 | 0.35 | D-BU | 1161 | Accelerator Pedal Position (APP) Sensor 1 Signal | I | - |
| 2 | 0.8 | PU | 1670 | Heated Oxygen Sensor (HO2S) High Signal - Bank 2 Sensor 2 | I | - |
| 3 | 0.5 | D-BU | 5985 | Accessory Wakeup Serial Data | I | - |
| 4-5 | - | - | - | Not Occupied | - | - |
| 6 | 0.35 | D-GN/WH | 465 | Fuel Pump Relay Control - Primary | I | - |
| 7 | - | - | - | Not Occupied | - | - |
| 8 | 0.35 | TN | 5514 | Low Reference | I | C60 |
| 9 | 0.8 | TN/WH | 1669 | Heated Oxygen Sensor (HO2S) Low Signal - Bank 1 Sensor 2 | I | - |
| 10 | 0.8 | TN | 1671 | Heated Oxygen Sensor (HO2S) Low Signal - Bank 2 Sensor 2 | I | - |
| 11 | 0.5 | BN | 5360 | Brake Apply Sensor Low Reference | I | - |
| 12 | - | - | - | Not Occupied | - | - |
| 13 | 0.5 | YE | 5991 | Powertrain Relay Control | I | - |
| 14 | - | - | - | Not Occupied | - | - |
| 15 | 0.8 | GY/WH | 3122 | Heated Oxygen Sensor (HO2S) Heater Low Control - Bank 1 Sensor 2 | I | - |
| 16 | 0.8 | OG/WH | 3223 | Heated Oxygen Sensor (HO2S) Heater Low Control - Bank 2 Sensor 2 | I | - |
| 17 | 0.8 | PU/WH | 1668 | Heated Oxygen Sensor (HO2S) High Signal - Bank 1 Sensor 2 | I | - |
| 18 | 0.35 | L-BU | 1162 | Accelerator Pedal Position (APP) Sensor 2 Signal | I | - |
| 19 | 0.5 | PK | 439 | Ignition Voltage | I | - |
| 20 | 0.5 | RD/WH | 440 | Battery Positive Voltage | I | - |
| 21 | 0.35 | PU | 1272 | Low Reference | I | - |
| 22-23 | - | - | - | Not Occupied | - | - |
| 24 | 0.5 | TN/BK | 6049 | Low Reference | I | - |
| 25 | 0.35 | OG/BK | 380 | A/C Refrigerant Pressure Sensor Signal | I | C60 |
| 26 | - | - | - | Not Occupied | - | - |
| 27 | 0.35 | BN/WH | 419 | MIL Control | I | - |
| 28-29 | - | - | - | Not Occupied | - | - |
| 30 | 0.35 | D-GN/WH | 459 | A/C Compressor Clutch Relay Control | I | C60 |
| 31 | - | - | - | Not Occupied | - | - |
| 32 | 0.35 | YE/BK | 625 | Starter Enable Relay Control | I | - |
| 33-34 | - | - | - | Not Occupied | - | - |
| 35 | 0.8 | TN | 2760 | Low Reference | I | - |
| 36 | - | - | - | Not Occupied | - | - |
| 37 | 0.5 | YE | 492 | Mass Air Flow (MAF) Sensor Signal | I | - |
| 38 | - | - | - | Not Occupied | - | - |
| 39 | 0.5 | PU | 1589 | Fuel Level Sensor Signal - Primary | I | - |
| 40 | - | - | - | Not Occupied | - | - |
| 41 | 0.35 | BN | 1271 | Low Reference | I | - |
| 42 | 0.5 | D-GN | 890 | Fuel Tank Pressure Sensor Signal | I | - |
| 43 | 0.5 | TN/BK | 2500 | High Speed GMLAN Serial Data Bus (+) | I | - |
| 44 | 0.5 | TN | 2501 | High Speed GMLAN Serial Data Bus (-) | I | - |
| 45 | 0.5 | WH | 5359 | Brake Apply Sensor Supply Voltage | I | - |
| 46 | - | - | - | Not Occupied | - | - |
| 47 | 0.35 | WH/BK | 1164 | 5-Volt Reference 2 | I | - |
| 48-49 | - | - | - | Not Occupied | - | - |
| 50 | 0.35 | YE/BK | 1827 | Vehicle Speed Signal | I | - |
| 51-53 | - | - | - | Not Occupied | - | - |
| 54 | 0.5 | OG/BK | 6399 | Replicated TOS Signal | I | - |
| 55 | 0.5 | L-BU/WH | 6311 | Torque Converter Clutch (TCC) Brake Signal | I | - |
| 56 | - | - | - | Not Occupied | - | - |
| 57 | 0.35 | OG/BK | 1786 | Park/Neutral Signal | I | - |
| 58 | 0.5 | TN | 472 | Intake Air Temperature (IAT) Sensor Signal | I | - |
| 59-60 | - | - | - | Not Occupied | - | - |
| 61 | 0.5 | YE | 5361 | Brake Apply Sensor Signal | - | - |
| 62-64 | - | - | - | Not Occupied | - | - |
| 65 | 0.35 | GY | 2700 | 5-Volt Reference 1 | I | C60 |
| 66 | 0.5 | GY | 2709 | 5-Volt Reference 1 | I | - |
| 67 | 0.35 | TN | 1274 | 5-Volt Reference 1 | I | - |
| 68-69 | - | - | - | Not Occupied | - | - |
| 70 | 0.5 | WH | 1310 | Evaporative Emission (EVAP) Canister Vent Solenoid Control | I | - |
| 71-72 | - | - | - | Not Occupied | - | - |
| 73 | 0.5 | PK | 1339 | Ignition Voltage | - | - |
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.