LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Chevrolet >> 2004 >> Avalanche 2500 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 8.1L (Introduction) >> Component Locator >> Powertrain Control Module (PCM) Connectors
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Powertrain Control Module (PCM) Connectors

Powertrain Control Module (PCM) - C1

GM655733Courtesy of GENERAL MOTORS CORP.
Connector Part Information
  • 12191489
  • 80-Way F Micro-Pack 100W Sealed (BLU)
Pin Wire Color Circuit No. Function
1 BLK/WHT 451 Ground
2 LT GRN 1867 12-Volt Reference
3 PNK/BLK 1746 Fuel Injector 3 Control
4 LT GRN/BLK 1745 Fuel Injector 2 Control
5-6 - - Not Used
7 GRY 2705 5-Volt Reference
8-10 - - Not Used
11 LT BLU 1876 Knock Sensor 2 Signal
12 DK BLU/
WHT		 1869 CKP Sensor Signal
13 ORN/BLK 463 Requested Torque Signal
14 ORN/BLK 1061 UART Serial Data
15 DK BLU/
WHT		 774 UART Serial Data
16-17 - - Not Used
18 DK GRN 1433 Clutch Start Switch Signal (M/T)
19 PNK 439 Ignition 1 Voltage
20 ORN 440 Battery Positive Voltage
21 YEL/BLK 1868 Low Reference
22 LT GRN 488 PTO Enable Switch (w/PTO)
23 BLK 470 Low Reference
24 BLK/WHT 451 Ground
25 TAN 1671 HO2S Low Signal Bank 2 Sensor 2 (w/NC1)
26 TAN 1677 HO2S Low Signal Bank 2 Sensor 1
27 BLK/WHT 451 Ground
28 TAN 1669 HO2S Low Signal Bank 1 Sensor 2 (w/NC1)
29 TAN 1664 HO2S Low Signal Bank 1 Sensor 1
30 LT GRN 1478 Coolant Level Switch Signal
31-32 - - Not Used
33 PPL 420 TCC Brake Switch/Cruise Control Release Signal
34 ORN/BLK 1786 Park/Neutral Signal (Allison Transmission Only)
35 GRY 48 CPP Switch Signal (M/T)
36 BLK 1744 Fuel Injector 1 Control
37 YEL/BLK 846 Fuel Injector 6 Control
38 - - Not Used
39 YEL/BLK 625 Starter Enable Relay Control
40 BLK/WHT 451 Ground
41 PPL 719 Low Reference
42 - - Not Used
43 RED/BLK 877 Fuel Injector 7 Control
44 LT BLU/BLK 844 Fuel Injector 4 Control
45 GRY 2700 5-Volt Reference
46 GRY 474 5-Volt Reference
47 GRY 596 5-Volt Reference
48 GRY 597 5-Volt Reference
49-50 - - Not Used
51 DK BLU 496 Knock Sensor 1 Signal
52 YEL 2522 PTO Status (w/PTO)
53 - - Not Used
54 ORN/BLK 469 Low Reference
55 BRN 1456 EGR Valve Position Signal
56 - - Not Used
57 ORN 440 Battery Positive Voltage
58 DK GRN 1049 PCM Class 2 Serial Data
59 YEL 710 Class 2 Serial Data
60 - - Not Used
61 PNK/BLK 632 Low Reference
62 - - Not Used
63 BLK 2755 Low Reference
64 BLK/WHT 451 Ground
65 PPL 1670 HO2S High Signal Bank 2 Sensor 2 (w/NC1)
66 PPL 1666 HO2S High Signal Bank 2 Sensor 1
67 BLK/WHT 451 Ground
68 PPL/WHT 1668 HO2S High Signal Bank 1 Sensor 2 (w/NC1)
69 PPL/WHT 1665 HO2S High Signal Bank 1 Sensor 1
70 BRN 1174 Oil Level Switch Signal
71 LT BLU 494 PTO Engine Kill (w/PTO)
72 - - Not Used
73 BRN/WHT 633 CMP Sensor Signal
74 YEL 410 ECT Sensor Signal
75 PNK 1020 Off/Run/Crank Voltage
76 BLK/WHT 845 Fuel Injector 5 Control
77 DK BLU/
WHT		 878 Fuel Injector 8 Control
78 PPL 2562 PTO Engage (w/PTO)
79 - - Not Used
80 BLK 407 Low Reference
Powertrain Control Module (PCM) - C2

GM684875Courtesy of GENERAL MOTORS CORP.
Connector Part Information
  • 12191488
  • 80-Way F Micro-Pack 100W Sealed (RED)
Pin Wire Color Circuit No. Function
1 BLK/WHT 451 Ground
2 WHT 2467 Torque Response Reply Signal (Allison Trans Only)
3 TAN 1465 Fuel Pump Relay Control - Secondary
4 - - Not Used
5 TAN/BLK 464 Delivered Torque Signal (Allison Trans Only)
6 - - Not Used
7 RED 1676 EGR Valve Supply Voltage
8 - - Not Used
9 DK GRN/
WHT		 465 Fuel Pump Relay Control
10 WHT 121 Engine Speed Signal
11 - - Not Used
12 DK BLU 2466 Trans MIL Request Signal (Allison Trans Only)
13 - - Not Used
14 RED/BLK 380 A/C Refrigerant Pressure Sensor Signal
15 BRN 25 Charge Indicator Control
16 GRY/BLK 1694 4WD Low Signal (w/4WD)
17-18 - - Not Used
19 BLK/WHT 1695 Axle Switch Signal (w/NP2)
20 LT GRN/BLK 822 VSS Low Signal
21 PPL/WHT 821 VSS High Signal (Except Allison Transmission
YEL 400 Signal High - Front (Allison Trans Only)
22-24 - - Not Used
25 TAN 472 IAT Sensor Signal
26 PPL 2121 IC 1 Control
27 RED 2127 IC 7 Control
28 LT BLU/WHT 2126 IC 6 Control
29 DK GRN/
WHT		 2124 IC 4 Control
30 - - Not Used
31 YEL 492 MAF Sensor Signal
32 LT GRN 432 MAP Sensor Signal
33 - - Not Used
34 DK GRN/
WHT		 428 EVAP Canister Purge Solenoid Control
35-38 - - Not Used
39 RED 631 12-Volt Reference
40 BLK/WHT 451 Ground
41 WHT 257 EGR Solenoid Control
42 - - Not Used
43 DK GRN/
WHT		 459 A/C Compressor Clutch Relay Control
44 - - Not Used
45 WHT 1310 EVAP Canister Vent Solenoid Control
46 BRN/WHT 419 MIL Control
47-48 - - Not Used
49 YEL/BLK 1827 Vehicle Speed Signal
50 DK GRN/
WHT		 817 Vehicle Speed Signal
51 - - Not Used
52 BRN 2391 HO2S Heater Low Control Bank 1 Sensor 2 (W/NC1)
53 RED/WHT 3223 HO2S Heater Low Control Bank 2 Sensor 2 (W/NC1)
54 PPL 1589 Fuel Level Sensor Signal
55-56 - - Not Used
57 BLK 552 Low Reference
58 TAN/WHT 332 Oil Pressure Sensor Signal
59 PPL 806 Crank Voltage
60 BRN 2129 Low Reference
61 BRN/WHT 2130 Low Reference
62-63 - - Not Used
64 DK GRN 890 Fuel Tank Pressure Sensor Signal
65 - - Not Used
66 PPL/WHT 2128 IC 8 Control
67 RED/WHT 2122 IC 2 Control
68 DK GRN 2125 IC 5 Control
69 LT BLU 2123 IC 3 Control
70-71 - - Not Used
72 BLK/WHT 3122 HO2S Heater Low Control Bank 1 Sensor 2 (w/NC1)
73 DK BLU 1936 Fuel Level Sensor Signal - Secondary
74 LT GRN/WHT 3213 HO2S Heater Low Control Bank 2 Sensor 1
75-79 - - Not Used
80 BLK 2751 Low Reference
scientia non olet · About LEMON Manuals