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 MANUALSGMC2024SIERRA 2500 HD DENALI ULTIMATEREPAIR AND DIAGNOSISELECTRICALWIRING DIAGRAMSCOMPONENT CONNECTOR END VIEWS (K20 - K44)COMPONENT CONNECTOR END VIEWSK20 ENGINE CONTROL MODULE X2 (L8T)
2024 GMC Sierra 2500 HD Denali Ultimate
K20 Engine Control Module X2 (L8T)
2024 GMC Sierra 2500 HD Denali UltimateSECTION K20 Engine Control Module X2 (L8T)
Connector Part Information
|
Terminal Part Information
| Terminal Type ID | Terminated Lead | Diagnostic Test Probe | Terminal Removal Tool |
|---|---|---|---|
| I | 13587518 | J-35616-35 (VT) | J-38125-11A |
| II | 19354746 | J-35616-64B (L-BU) | J-38125-215A |
| Pin | Size | Color | Circuit | Function | Terminal Type ID | Option |
|---|---|---|---|---|---|---|
| 1 | 0.5 | GN / YE | 3212 | HO2S Heater Low Control Bank 2 Sensor 1 | II | - |
| 3 | 0.5 | BK / YE | 548 | Engine Control Sensors Low Reference 1 | II | - |
| 7 | 0.5 | GN / WH | 4622 | Engine Control Module LIN Bus 2 | II | - |
| 8 | 0.5 | GN / VT | 4621 | Engine Control Module LIN Bus 1 | II | - |
| 10 | 0.5 | VT / GY | 3110 | HO2S High Signal Bank 1 Sensor 1 | II | - |
| 11 | 0.5 | WH / BK | 3111 | HO2S Low Signal Bank 1 Sensor 1 | II | - |
| 12 | 0.5 | YE / BU | 2124 | Ignition Control 4 | II | - |
| 13 | 0.5 | BN / BU | 2126 | Ignition Control 6 | II | - |
| 17 | 0.5 | GY / WH | 3113 | HO2S Heater Low Control Bank 1 Sensor 1 | II | - |
| 26 | 0.5 | VT / WH | 3210 | HO2S High Signal Bank 2 Sensor 1 | II | - |
| 27 | 0.5 | YE / WH | 3211 | HO2S Low Signal Bank 2 Sensor 1 | II | - |
| 28 | 0.5 | GN / BU | 2123 | Ignition Control 3 | II | - |
| 29 | 0.5 | BU / GY | 2125 | Ignition Control 5 | II | - |
| 30 | 0.5 | BK / GY | 2130 | Ignition Control Low Reference Bank 2 | II | - |
| 33 | 0.5 | WH / BN | 3223 | HO2S Heater Low Control Bank 2 Sensor 2 | II | - |
| 35 | 0.5 | BU | 179 | Engine Oil Pump Control | II | - |
| 37 | 0.5 | VT / BU | 5294 | Powertrain Main Relay Fused Supply Voltage 5 | II | - |
| 39 | 0.5 | WH / RD | 480 | Engine Control Vehicle Sensors 5 Volt Reference 1 | II | - |
| 46 | 0.5 | YE / BU | 3221 | HO2S Low Signal Bank 2 Sensor 2 | II | - |
| 47 | 0.5 | VT / GN | 3220 | HO2S High Signal Bank 2 Sensor 2 | II | - |
| 50 | 0.5 | BK / GY | 2303 | Knock Sensor Low Reference 2 | II | - |
| 51 | 0.5 | BK / YE | 1716 | Knock Sensor Low Reference 1 | II | - |
| 52 | 0.5 | BN / WH | 582 | Throttle Actuator Close Control | II | - |
| 53 | 0.5 | GY / WH | 3122 | HO2S Heater Low Control Bank 1 Sensor 2 | II | - |
| 66 | 0.5 | WH / YE | 3121 | HO2S Low Signal Bank 1 Sensor 2 | II | - |
| 67 | 0.5 | BN | 3120 | HO2S High Signal Bank 1 Sensor 2 | II | - |
| 70 | 0.5 | WH / GY | 1876 | Knock Sensor 2 Signal | II | - |
| 71 | 0.5 | VT / GY | 496 | Knock Sensor 1 Signal | II | - |
| 72 | 0.5 | YE | 581 | Throttle Actuator Open Control | II | - |
| 73 | 2.5 | BK / WH | 251 | Signal Ground | I | - |
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.