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HOMESERVICE MANUALSGMC2020ACADIA SLREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 438 (COMPONENT CONNECTOR END VIEWS (K20-K40))COMPONENT CONNECTOR END VIEWSK20 ENGINE CONTROL MODULE X1 (LSY)
2020 GMC Acadia SL

K20 Engine Control Module X1 (LSY)

2020 GMC Acadia SLSECTION K20 Engine Control Module X1 (LSY)
WARNING: This page is about a different car, the 2023 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
GM4504420Courtesy of GENERAL MOTORS COMPANY
Connector Part Information
  • Harness Type: Engine Wiring Harness
  • OEM Connector: 12672858
  • Service Connector: 19371186
  • Description: 66-Way F 0.64, 2.8 Series, Sealed (BK with BU Terminal Position Assurance)
Terminal Part Information

Terminal Type ID Terminated Lead Diagnostic Test Probe Terminal Removal Tool
I 13587518 J-35616-35 (VT) J-38125-11A
II 19351723 J-35616-64B (L-BU) J-38125-213
Pin Size Color Circuit Function Terminal Type ID Option
1 0.5 YE 5991 Powertrain Relay Coil Control II LSY
2 0.5 YE/BK 625 Starter Enable Relay Control II LSY
3 0.5 YE/VT 4325 Starter Pinion Solenoid Actuator Relay Control II LSY
4 - 5 - - - Not Occupied - -
6 0.5 GN/BK 3616 Intake Camshaft Profile Actuator 1 Control B II LSY
7 0.5 VT/GY 3615 Intake Camshaft Profile Actuator 1 Control A II LSY
8 0.5 BU 3584 Intake Camshaft Profile Actuator 2 Control B II LSY
9 0.5 GN 3585 Intake Camshaft Profile Actuator 2 Control A II LSY
10 0.5 YE/BU 3587 Intake Camshaft Profile Actuator 3 Control A II LSY
11 0.5 GY 3586 Intake Camshaft Profile Actuator 3 Control B II LSY
12 0.5 BU/WH 3589 Intake Camshaft Profile Actuator 1 Position Sensor Signal II LSY
13 0.5 GN/WH 3592 Intake Camshaft Profile Actuator 2 Position Sensor Signal II LSY
14 0.5 BK/GN 3593 Intake Camshaft Profile Actuator 3 Position Sensor Signal II LSY
15 0.5 WH/BU 6311 Cruise/ETC/TCC Brake Signal II LSY
16 0.5 VT/BU 5291 Powertrain Main Relay Fused Supply Voltage 2 II LSY
17 0.5 GN/GY 465 Fuel Pump Primary Relay Control II LSY
18 0.5 WH/GY 459 Air Conditioning Compressor Clutch Relay Control II LSY
19 0.5 BN/WH 419 Check Engine Indicator Control II LSY
20 - 21 - - - Not Occupied - -
22 0.5 GY/YE 1502 Intake Camshaft Profile Actuator 4 Control B II LSY
23 0.5 GN/YE 1402 Intake Camshaft Profile Actuator 4 Control A II LSY
24 0.5 YE/VT 6265 Exhaust Camshaft Profile Actuator 2 Control B II LSY
25 0.5 VT/BK 6264 Exhaust Camshaft Profile Actuator 2 Control A II LSY
26 0.5 GY/BN 6262 Exhaust Camshaft Profile Actuator 3 Control B II LSY
27 0.5 GN/BN 6261 Exhaust Camshaft Profile Actuator 3 Control A II LSY
28 0.5 YE/BN 1702 Intake Camshaft Profile Actuator 4 Position Sensor Signal II LSY
29 0.5 GN/BK 6266 Exhaust Camshaft Profile Actuator 2 Position Sensor Signal II LSY
30 0.5 YE 6263 Exhaust Camshaft Profile Actuator 3 Position Sensor Signal II LSY
31 - - - Not Occupied - -
32 0.5 VT/GY 139 Run/Crank Ignition 1 Voltage II LSY
33 0.5 BK/BU 1271 Accelerator Pedal Position Low Reference 1 II LSY
34 0.5 VT/GN 3745 Camshaft Intake Lobe Axial Position Signal 2 II LSY
35 0.5 BK/VT 1272 Accelerator Pedal Position Low Reference 2 II LSY
36 0.5 YE/GN 3747 Camshaft Exhaust Lobe Axial Position Signal 2 II LSY
37 0.5 YE 4063 Hood Status A Signal II LSY
38 - - - Not Occupied - -
39 0.5 YE/WH 1161 Accelerator Pedal Position Signal 1 II LSY
40 - 41 - - - Not Occupied - -
42 0.5 GN/BK 4624 Engine Control Module LIN Bus 3 II LSY
43 - 44 - - - Not Occupied - -
45 0.5 WH 4499 High Speed GMLAN Serial Data [-] 7 II LSY
46 0.5 BU/BN 4498 High Speed GMLAN Serial Data [+] 7 II LSY
47 0.5 GN/WH 492 Mass Air Flow Sensor Signal II LSY
48 0.5 RD/WH 140 Battery Positive Voltage II LSY
49 0.5 WH/RD 1164 Accelerator Pedal Position 5V Reference 1 II LSY
50 0.5 VT/WH 3744 Camshaft Intake Lobe Axial Position Signal 1 II LSY
51 0.5 BN/RD 1274 Accelerator Pedal Position 5V Reference 2 II LSY
52 0.5 YE/WH 3746 Camshaft Exhaust Lobe Axial Position Signal 1 II LSY
53 0.5 BU/GY 636 Ambient Air Temperature Sensor Signal II LSY
54 0.5 YE/BK 942 Engine Coolant Temperature 4 Signal II LSY
55 0.5 GN 380 Air Conditioning Refrigerant Pressure Sensor Signal II LSY
56 0.5 WH/GN 5380 Brake Position Sensor Signal II LSY
57 0.5 GN/WH 1162 Accelerator Pedal Position Signal 2 II LSY
58 - - - Not Occupied - -
59 0.5 WH 2501 High Speed GMLAN Serial Data [-] 1 II LSY
60 0.5 BU 2500 High Speed GMLAN Serial Data [+] 1 II LSY
61 - - - Not Occupied - -
62 0.5 VT/YE 5985 Accessory Wake-Up Serial Data II LSY
63 0.5 WH 7494 High Speed GMLAN Serial Data [-] 3 II LSY
64 0.5 BU/BK 7493 High Speed GMLAN Serial Data [+] 3 II LSY
65 2 BK/WH 451 Signal Ground I LSY
66 2 VT/BU 5292 Powertrain Main Relay Fused Supply Voltage 3 I LSY
RENDER: 1.0x

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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.