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 (G34 - K20)COMPONENT CONNECTOR END VIEWSK20 ENGINE CONTROL MODULE X1 (L5P)
2024 GMC Sierra 2500 HD Denali Ultimate
K20 Engine Control Module X1 (L5P)
2024 GMC Sierra 2500 HD Denali UltimateSECTION K20 Engine Control Module X1 (L5P)
Connector Part Information
|
Terminal Part Information
| Terminal Type ID | Terminated Lead | Diagnostic Test Probe | Terminal Removal Tool |
|---|---|---|---|
| I | 19355735 | J-35616-4A (PU) | J-38125-215A |
| II | 85079962 | EL-35616-58 (BK) | EL-38125-560A |
| III | 85079963 | J-35616-12 (BU) | J-38125-215A |
| IV | 85079964 | J-35616-42 (RD) | J-38125-215A |
| Pin | Size | Color | Circuit | Function | Terminal Type ID | Option |
|---|---|---|---|---|---|---|
| 1 | 4 | BK / WH | 251 | Signal Ground | IV | - |
| 2 | 4 | VT / BU | 5290 | Powertrain Main Relay Fused Supply Voltage 1 | IV | - |
| 3 | 0.75 | RD / BN | 440 | Battery Positive Voltage | III | - |
| 4 | 0.75 | VT / GN | 439 | Run/Crank Ignition 1 Voltage | III | - |
| 5 | 0.5 | BU / GN | 11437 | Secondary Fuel Pump Disable Signal | III | - |
| 6 | 0.5 | GN / GY | 465 | Fuel Pump Primary Relay Control | III | - |
| 7 | 0.5 | VT / BN | 2927 | Exhaust Aftertreatment Fuel Injector Low Control | III | - |
| 8 | 0.5 | YE | 5991 | Powertrain Relay Coil Control | III | - |
| 9 | 0.5 | BN / BU | 2926 | Exhaust Aftertreatment Fuel Injector High Control | III | - |
| 10 | 0.5 | BN / WH | 3100 | Diesel Exhaust Fluid Dosing Valve Low Control | III | - |
| 11 | 0.5 | GN / BU | 3889 | Powertrain Sensor Bus Relay Control | III | - |
| 12 | 0.5 | BN | 3099 | Diesel Exhaust Fluid Dosing Valve High Control | III | - |
| 13 | 0.5 | BN / YE | 11438 | Power Take Off Wakeup Signal | II | - |
| 14 | 0.5 | WH / BK | 2366 | Cooling Fan Speed Control Signal | II | - |
| 15 | 0.5 | BU | 3017 | Fuel Heater Relay 1 Control | II | - |
| 16 | 0.5 | WH / GY | 459 | Air Conditioning Compressor Clutch Relay Control | II | - |
| 17 | - | - | - | Not Occupied | - | - |
| 18 | 0.5 | YE / WH | 1161 | Accelerator Pedal Position Signal 1 | II | - |
| 19 | 0.5 | WH / RD | 1164 | Accelerator Pedal Position 5V Reference 1 | II | - |
| 20 | 0.5 | BN / RD | 1274 | Accelerator Pedal Position 5V Reference 2 | II | - |
| 21 | 0.5 | GN / WH | 1162 | Accelerator Pedal Position Signal 2 | II | - |
| 22 | - | - | - | Not Occupied | - | - |
| 23 | 0.5 | BU / GY | 4054 | Private Serial Data Powertrain CAN Bus [-] Serial Data | II | - |
| 24 | 0.5 | WH | 4976 | AUTOSAR CAN Bus [-] 3 Serial Data | II | - |
| 25 | 0.5 | WH | 4978 | AUTOSAR CAN Bus [-] 2 Serial Data | II | - |
| 26 - 27 | - | - | - | Not Occupied | - | - |
| 28 | 0.5 | GN / BN | 507 | Wait To Start Indicator Control | II | - |
| 29 - 30 | - | - | - | Not Occupied | - | - |
| 31 | 0.5 | BK / BU | 1271 | Accelerator Pedal Position Low Reference 1 | II | - |
| 32 | - | - | - | Not Occupied | - | - |
| 33 | 0.5 | BK / GY | 626 | Engine Control Vehicle Sensors Low Reference 1 | II | - |
| 34 | 0.5 | BK / VT | 1272 | Accelerator Pedal Position Low Reference 2 | II | - |
| 35 | - | - | - | Not Occupied | - | - |
| 36 | 0.5 | WH | 4055 | Private Serial Data Powertrain CAN Bus [+] Serial Data | II | - |
| 37 | 0.5 | BU / BK | 4977 | AUTOSAR CAN Bus [+] 3 Serial Data | II | - |
| 38 | 0.5 | BU / YE | 4979 | AUTOSAR CAN Bus [+] 2 Serial Data | II | - |
| 39 | 0.5 | BN | 25 | Charge Indicator Control | II | - |
| 40 | - | - | - | Not Occupied | - | - |
| 41 | 0.5 | BU / VT | 2364 | Cooling Fan Speed Signal | II | - |
| 42 - 43 | - | - | - | Not Occupied | - | - |
| 44 | 0.5 | BU / GY | 636 | Ambient Air Temperature Sensor Signal | II | - |
| 45 | 0.5 | WH / GN | 5380 | Brake Position Sensor Signal | II | - |
| 46 | 0.5 | YE | 4063 | Hood Status A Signal | II | - |
| 47 | 0.5 | GN | 380 | Air Conditioning Refrigerant Pressure Sensor Signal | II | - |
| 48 - 51 | - | - | - | Not Occupied | - | - |
| 52 | 0.5 | YE / BK | 625 | Starter Enable Relay Control | II | - |
| 53 | - | - | - | Not Occupied | - | - |
| 54 | 0.5 | GN / YE | 3337 | Transmission Internal Mode Switch Mode Control Y | II | - |
| 55 | 0.5 | GY | 23 | Generator Field Duty Cycle Signal | II | - |
| 56 | 0.5 | BU | 492 | Mass Air Flow Sensor Signal | II | - |
| 57 - 61 | - | - | - | Not Occupied | - | - |
| 62 | 0.5 | GN / VT | 4621 | Engine Control Module LIN Bus 1 | II | - |
| 63 | 0.5 | GN / WH | 4622 | Engine Control Module LIN Bus 2 | II | - |
| 64 - 66 | - | - | - | Not Occupied | - | - |
| 67 | 0.5 0.5 |
WH / GN BK |
6142 163 |
Power Take-Off Engine Shutdown Signal Folding Top Motor Down Control |
II II |
PTO -PTO |
| 68 - 72 | - | - | - | Not Occupied | - | - |
| 73 | 0.5 | BU | 10290 | Exhaust Gas Temperature Sensor SENT 2 Signal | II | - |
| 74 | 0.5 | YE | 10291 | Exhaust Gas Temperature Sensor SENT 3 Signal | II | - |
| 75 - 76 | - | - | - | Not Occupied | - | - |
| 77 | 0.5 | WH / BN | 2363 | Exhaust Pressure Sensor SENT 1 Signal | II | - |
| 78 | 0.5 | WH / RD | 480 | Engine Control Vehicle Sensors 5 Volt Reference 1 | II | - |
| 79 | 0.5 | YE / RD | 10595 | Engine Control Vehicle Sensors 5 Volt Reference 2 | II | - |
| 80 - 91 | - | - | - | Not Occupied | - | - |
| 92 | 2.5 | VT / BU | 5294 | Powertrain Main Relay Fused Supply Voltage 5 | I | - |
| 93 | 2.5 | VT / BU | 5290 | Powertrain Main Relay Fused Supply Voltage 1 | 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.