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HOMESERVICE MANUALSCHEVROLET2025TAHOE COMMERCIAL, 4WDREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALBODY ELECTRICALCOMPONENT CONNECTOR END VIEWS (K20-K43)COMPONENT CONNECTOR END VIEWSK20 ENGINE CONTROL MODULE X1 (LZ0)
2025 Chevrolet Tahoe Commercial, 4WD

K20 Engine Control Module X1 (LZ0)

2025 Chevrolet Tahoe Commercial, 4WDSECTION K20 Engine Control Module X1 (LZ0)
GM5492269Courtesy of GENERAL MOTORS COMPANY
Connector Part Information
  • Harness Type: Engine Wiring Harness
  • OEM Connector: 12699571
  • Service Connector: 84941451
  • Description: 90-Way F 0.64 GEN-Y, 2.8, 6.3 MCP Series, Sealed (BK with BU Terminal Position Assurance)
Terminal Part Information

Terminal Type ID Terminated Lead Diagnostic Test Probe Terminal Removal Tool
I 19367373 J-35616-64B (L-BU) J-38125-215A
II 19371214 J-35616-35 (VT) J-38125-556
III 84616649 J-35616-42 (RD) J-38125-556
Pin Size Color Circuit Function Terminal Type ID Option
1 6 BN / BU 104 Glow Plug Control III -
2 2.5 GY / YE 1584 Glow Plug 4 Control II -
3 - 5 - - - Not Occupied - -
6 0.5 WH / GY 459 Air Conditioning Compressor Clutch Relay Control I -
7 0.75 RD / BN 440 Battery Positive Voltage I -
8 0.5 GN / WH 492 Mass Air Flow Sensor Signal I -
9 - 10 - - - Not Occupied - -
11 0.5 GY 2973 Coolant Flow Control Valve Position Signal I -
12 0.5 GN / GY 7316 Intake Manifold Runner Valve Actuator Control I -
13 0.5 GN 10289 Exhaust Gas Temperature Sensor SENT 1 Signal I -
14 0.5 BU 10290 Exhaust Gas Temperature Sensor SENT 2 Signal I -
15 0.5 BN / GN 4305 Exhaust Flow Control Valve 1 I -
16 0.5 WH 4055 Private Serial Data Powertrain CAN Bus [+] Serial Data I -
17 0.5 BU / BK 4977 AUTOSAR CAN Bus [+] 3 Serial Data I -
18 0.5 BU / YE 4979 AUTOSAR CAN Bus [+] 2 Serial Data I -
19 0.5 BK / GN 580 Engine Control Sensors Low Reference 2 I -
20 - - - Not Occupied - -
21 0.75 GY / BK 1330 Variable Geometry Turbocharger Position Sensor Motor Close Control I -
22 0.75 WH / BN 1313 Variable Geometry Turbocharger Position Sensor Motor Open Control I -
23 2.5 GY / GN 1583 Glow Plug 3 Control II -
24 2.5 GY / BN 1582 Glow Plug 2 Control II -
25 0.75 VT / GN 439 Run/Crank Ignition 1 Voltage I -
26 0.5 YE 5991 Powertrain Relay Coil Control I -
27 - - - Not Occupied - -
28 0.5 GN / BN 507 Wait To Start Indicator Control I -
29 - - - Not Occupied - -
30 0.5 BK / GY 626 Engine Control Vehicle Sensors Low Reference 1 I -
31 - 32 - - - Not Occupied - -
33 0.5 WH / BN 2363 Exhaust Pressure Sensor SENT 1 Signal I -
34 0.5 VT / YE 5947 Turbocharger Vane Position Sensor Signal I -
35 0.5 BN / WH 5763 Exhaust Gas Recirculation Position Signal I -
36 0.5 BU / GY 2978 Coolant Diverter Valve Position Signal I -
37 0.5 GN 10478 Low Pressure Exhaust Gas Recirculation Sensor SENT Signal I -
38 0.5 BU / GY 4054 Private Serial Data Powertrain CAN Bus [-] Serial Data I -
39 0.5 WH 4976 AUTOSAR CAN Bus [-] 3 Serial Data I -
40 0.5 WH 4978 AUTOSAR CAN Bus [-] 2 Serial Data I -
41 - - - Not Occupied - -
42 0.5 YE / BK 625 Starter Enable Relay Control I -
43 0.75 VT / BK 5746 Exhaust Gas Recirculation Valve Low Control I -
44 0.75 WH / VT 5764 Exhaust Gas Recirculation Valve High Control I -
45 2.5 GY / WH 1585 Glow Plug 5 Control II -
46 5 BK / WH 6151 Engine Control Module Ground III -
47 2.5 GY / VT 1586 Glow Plug 6 Control II -
48 0.5 WH / RD 480 Engine Control Vehicle Sensors 5 Volt Reference 1 I -
49 0.5 GN / WH 1162 Accelerator Pedal Position Signal 2 I -
50 0.5 BK / VT 1272 Accelerator Pedal Position Low Reference 2 I -
51 0.5 BK / BU 1271 Accelerator Pedal Position Low Reference 1 I -
52 0.5 WH / GN 5380 Brake Position Sensor Signal I -
53 - 54 - - - Not Occupied - -
55 0.5 YE 4063 Hood Status A Signal I -
56 - 58 - - - Not Occupied - -
59 0.5 GN 380 Air Conditioning Refrigerant Pressure Sensor Signal I -
60 0.5 YE / BN 331 Oil Pressure Sensor Signal I -
61 0.5 YE / GY 3926 Crankcase Differential Pressure Sensor Signal I -
62 - 63 - - - Not Occupied - -
64 0.5 GN / BU 3889 Powertrain Sensor Bus Relay Control I -
65 - - - Not Occupied - -
66 0.75 BN 1421 Exhaust Restrictor Motor Closed Control I -
67 0.75 YE / BN 1420 Exhaust Restrictor Motor Open Control I -
68 2.5 GY / BU 1581 Glow Plug 1 Control II -
69 2.5 VT / BU 5291 Powertrain Main Relay Fused Supply Voltage 2 II -
70 0.5 BU / RD 460 Engine Control Sensors 5 Volt Reference 1 I -
71 0.5 BN / RD 1274 Accelerator Pedal Position 5V Reference 2 I -
72 0.5 WH / RD 1164 Accelerator Pedal Position 5V Reference 1 I -
73 0.5 YE / WH 1161 Accelerator Pedal Position Signal 1 I -
74 0.5 BU / GY 636 Ambient Air Temperature Sensor Signal I -
75 0.5 VT 7485 Engine Oil Temperature Sensor 2 Signal I -
76 - 85 - - - Not Occupied - -
86 0.5 GN / GY 465 Fuel Pump Primary Relay Control I -
87 0.75 VT / BU 5294 Powertrain Main Relay Fused Supply Voltage 5 I -
88 0.75 GY / BN 2972 Coolant Flow Control Actuator Control Close I -
89 0.75 GY / BU 2971 Coolant Flow Control Actuator Control Open I -
90 2.5 VT / BU 5290 Powertrain Main Relay Fused Supply Voltage 1 II -
RENDER: 1.0x

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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.