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.
2018 Buick Regal BaseFACTORY OEM SERVICE PROCEDURE
K20 Engine Control Module X2 (LGX)
WARNING: This page is about a different car, the 2020 Buick Regal TourX, 2020 Buick Regal, 2019 Buick Regal TourX, and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
Connector Part Information
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Terminal Part Information
| Terminal Type ID | Terminated Lead | Diagnostic Test Probe | Terminal Removal Tool | Service Terminal | Tray Name | Core Crimp | Insulation Crimp |
|---|---|---|---|---|---|---|---|
| I | 19355728 | J-35616-35 (VT) | J-38125-215A | Not Available | Not Available | Not Available | Not Available |
| II | 19355736 | J-35616-64B (LT BU) | J-38125-215A | Not Available | Not Available | Not Available | Not Available |
| III | 19355737 | J-35616-64B (LT BU) | J-38125-215A | Not Available | Not Available | Not Available | Not Available |
| Pin | Size | Color | Circuit | Function | Terminal Type ID | Option |
|---|---|---|---|---|---|---|
| 1 | 0.5 | GY/WH | 3122 | HO2S Heater Low Control Bank 1 Sensor 2 | II | - |
| 2 | 0.5 | WH/BN | 3223 | HO2S Heater Low Control Bank 2 Sensor 2 | II | - |
| 3 - 6 | - | - | - | Not Occupied | - | - |
| 7 | 0.35 | GN/VT | 4621 | Engine Control Module LIN Bus 1 | III | - |
| 8 | - | - | - | Not Occupied | - | - |
| 9 | 0.5 | BN/GN | 1174 | Oil Level Switch Signal | II | - |
| 10 | - | - | - | Not Occupied | - | - |
| 11 | 0.5 | YE/BN | 331 | Oil Pressure Sensor Signal | II | - |
| 12 | 0.5 | BK/YE | 548 | Engine Control Sensors Low Reference 1 | II | - |
| 13 - 16 | - | - | - | Not Occupied | - | - |
| 17 | 0.5 | GY/WH | 3113 | HO2S Heater Low Control Bank 1 Sensor 1 | II | - |
| 18 | 0.5 | GN/YE | 3212 | HO2S Heater Low Control Bank 2 Sensor 1 | II | - |
| 19 - 26 | - | - | - | Not Occupied | - | - |
| 27 | 0.5 | WH/RD | 2705 | Oil Pressure Sensor 5V Reference | II | - |
| 28 | 0.5 | VT/BU | 5294 | Powertrain Main Relay Fused Supply 5 | II | - |
| 29 - 34 | - | - | - | Not Occupied | - | - |
| 35 | 0.5 | WH/BK | 3111 | HO2S Low Signal Bank 1 Sensor 1 (3) | II | - |
| 36 | 0.5 | YE/WH | 3211 | HO2S Low Signal Bank 2 Sensor 1 | II | - |
| 37 | 0.5 | WH/YE | 3121 | HO2S Low Signal Bank 1 Sensor 2 | II | - |
| 38 | 0.5 | YE/BU | 3221 | HO2S Low Signal Bank 2 Sensor 2 | II | - |
| 39 | 0.5 | BK/YE | 1716 | Knock Sensor 1 Low Reference | II | - |
| 40 | 0.5 | BK/GY | 2303 | Knock Sensor 2 Low Reference | II | - |
| 41 | - | - | - | Not Occupied | - | - |
| 42 | 0.5 | YE/WH | 3200 | Throttle Inlet Absolute Pressure Sensor Signal | II | - |
| 43 | 0.5 | WH/RD | 3201 | Throttle Inlet Absolute Pressure Sensor 5V Reference | II | - |
| 44 - 46 | - | - | - | Not Occupied | - | - |
| 47 | 0.5 | GY/RD | 2704 | Manifold Absolute Pressure Sensor 5V Reference | II | - |
| 48 | 0.5 | BK/GN | 469 | Manifold Absolute Pressure Sensor Low Reference | II | - |
| 49 - 50 | - | - | - | Not Occupied | - | - |
| 51 | 0.5 | BK/GY | 626 | Engine Control Vehicle Sensors Low Reference 1 | II | - |
| 52 | 0.5 | BN/WH | 582 | Throttle Actuator Close Control | II | - |
| 53 - 54 | - | - | - | Not Occupied | - | - |
| 55 | 0.5 | VT/GY | 3110 | HO2S High Signal Bank 1 Sensor 1 | II | - |
| 56 | 0.5 | VT/WH | 3210 | HO2S High Signal Bank 2 Sensor 1 | II | - |
| 57 | 0.5 | VT/BU | 3120 | HO2S High Signal Bank 1 Sensor 2 | II | - |
| 58 | 0.5 | VT/GN | 3220 | HO2S High Signal Bank 2 Sensor 2 | II | - |
| 59 | 0.5 | VT/GY | 496 | Knock Sensor 1 Signal | II | - |
| 60 | 0.5 | WH/GY | 1876 | Knock Sensor 2 Signal | II | - |
| 61 - 62 | - | - | - | Not Occupied | - | - |
| 63 | 0.5 | BK/VT | 2760 | Intake Air Temperature Sensor Low Reference | II | - |
| 64 - 66 | - | - | - | Not Occupied | - | - |
| 67 | 0.5 | GN/WH | 432 | Manifold Absolute Pressure Sensor Signal | II | - |
| 68 - 69 | - | - | - | Not Occupied | - | - |
| 70 | 0.5 | WH/BU | 6289 | Intake Air Temperature Sensor Signal | II | - |
| 71 | - | - | - | Not Occupied | - | - |
| 72 | 0.5 | YE | 581 | Throttle Actuator Open Control | II | - |
| 73 | 2.5 | BK/WH | 151 | Ground 1 | I | - |
Factory Service Tools
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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.
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