2018 Buick Regal BaseFACTORY OEM SERVICE PROCEDURE

K20 Engine Control Module X1 (LTG+M3D)

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.
GM5146717Courtesy of GENERAL MOTORS COMPANY
Connector Part Information
  • Harness Type:Engine
  • OEM Connector: 35061507
  • Service Connector: 13574946
  • Description: 73 -Way F 0.64 MQS, 2.8 APEX Series, Sealed (BU)
Terminal Part Information

Terminal Type ID Terminated Lead Diagnostic Test Probe Terminal Removal Tool
I 135877518 J-35616-35 (VT) J-38125-215A
II 19351723 J-35616-64B (LT BU) J-38125-215A
III 19355737 J-35616-64B (LT BU) J-38125-215A
Pin Size Color Circuit Function Terminal Type ID Option
1 - 4 - - - Not Occupied - -
5 0.35 BU / BN 4498 High Speed GMLAN Serial Data [+] 7 III -
6 0.35 WH 4499 High Speed GMLAN Serial Data [-] 7 III -
7 0.5 WH 7494 High Speed GMLAN Serial Data [-] 3 II -
8 0.5 BU / BK 7493 High Speed GMLAN Serial Data [+] 3 II -
9 0.5 BU 2500 High Speed GMLAN Serial Data [+] 1 II -
10 0.5 WH 2501 High Speed GMLAN Serial Data [-] 1 II -
11 0.35 BN / RD 1274 Accelerator Pedal Position 5V Reference 2 III -
12 0.35 WH / RD 1164 Accelerator Pedal Position 5V Reference 1 III -
13 0.5 VT / YE 5985 Accessory Wake-Up Serial Data II -
14 0.5 VT / GN 439 Run/Crank Ignition 1 Voltage II -
15 0.5 RD / WH 140 Battery Positive Voltage II -
16 0.75 VT / BU 5292 Powertrain Main Relay Fused Supply 3 II -
17 0.5 YE 4063 Hood Status A Signal II -
18 0.5 GY / RD 3053 Turbo Intake Pressure Sensor High Reference Bank 1 II -
19 - 22 - - - Not Occupied - -
23 0.5 BK / GY 3927 Transmission Internal Mode Switch Feedback Signal II -
24 - - - Not Occupied - -
25 0.35 BK / YE 5382 Brake Position Sensor Low Reference III -
26 - - - Not Occupied - -
27 0.35 BK / VT 1272 Accelerator Pedal Position Low Reference 2 III -
28 0.35 BK / BU 1271 Accelerator Pedal Position Low Reference 1 III -
29 - 31 - - - Not Occupied - -
32 0.35 YE / VT 6030 Brake Vacuum Sensor Signal III -
33 0.35 GN / WH 1162 Accelerator Pedal Position Signal 2 III -
34 0.5 GN / WH 492 Mass Air Flow Sensor Signal II -
35 - 36 - - - Not Occupied - -
37 0.35 BN / RD 2700 A/C Pressure Sensor 5V Reference III -
38 - - - Not Occupied - -
39 0.5 YE / BU 4171 Transmission Position Sensor A 9V Reference II -
40 - - - Not Occupied - -
41 0.35 WH / RD 5381 Brake Position Sensor 5V Reference III -
42 - 43 - - - Not Occupied - -
44 0.35 YE / VT 4325 Starter Pinion Solenoid Relay Control III -
45 0.35 YE / WH 1161 Accelerator Pedal Position Signal 1 III -
46 - - - Not Occupied - -
47 0.5 BU / GY 636 Outside Ambient Air Temperature Sensor Signal II -
48 0.5 WH / BU 6289 Induction Air Temperature Sensor Signal II -
49 - - - Not Occupied - -
50 0.35 WH / BU 6311 Cruise/ETC/TCC Brake Signal III -
51 0.5 VT / BU 5291 Powertrain Main Relay Fused Supply 2 II -
52 0.35 WH 2368 Cooling Fan Control Signal III -
53 - - - Not Occupied - -
54 0.35 WH / GY 459 A/C Compressor Clutch Relay Control III -
55 - 56 - - - Not Occupied - -
57 0.35 GN 380 A/C Refrigerant Pressure Sensor Signal III -
58 - - - Not Occupied - -
59 0.5 WH / BU 5726 Ignition Mode Switch Mode Control Backup II -
60 0.5 BN / GY 4008 Humidity Sensor Signal II -
61 0.35 WH / GN 5380 Brake Position Sensor Signal III -
62 - 63 - - - Not Occupied - -
64 0.35 GN / GY 465 Fuel Pump Primary Relay Control III -
65 - - - Not Occupied - -
66 0.35 GY 5127 After Boil Heater Relay Control III -
67 0.35 YE 5991 Powertrain Relay Coil Control III -
68 - 69 - - - Not Occupied - -
70 0.35 YE / BK 625 Starter Enable Relay Control III -
71 0.35 BN / WH 419 Check Engine Indicator Control III -
72 - - - Not Occupied - -
73 2.5 VT / BU 5290 Powertrain Main Relay Fused Supply 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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