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.
2000 Chevrolet Pickup C2500, 4D Pickup, 6.5 F, StandardFACTORY OEM SERVICE PROCEDURE
Powertrain Control Module
PCM Cnnector C1
| Connector Part Information | - | - | * | 12160779 |
| - | - | - | * | PCM 32 Way BRN (C1) Connector |
| Pin | Wire Color | Circuit No. | Function | - |
| C1 | -- | -- | Not Used | - |
| C2 | DK GRN/WHT | 762 | A/C Request | - |
| C3 | -- | -- | Not Used | - |
| C4 | TAN | 472 | IAT Signal | - |
| C5 | LT BLU | 1162 | APP (2) Signal | - |
| C6 | YEL | 505 | Glow Plug Relay Control | - |
| C7 | RED/BLK | 1228 | Pressure Control Solenoid Valve (Hi) | |
| C8 | YEL | 1578 | Fuel Temperature | - |
| C9 | YEL/BLK | 1227 | TFT Sensor | - |
| C10 | -- | -- | Not Used | - |
| C11 | YEL | 410 | ECT Signal | - |
| C12 | -- | -- | Not Used | - |
| C13 | RED | 313 | Closure Signal | - |
| C14 | LT GRN | 432 | Boost Sensor Signal | - |
| C15 | LT BLU/WHT | 1229 | Pressure Control Solenoid Valve (Lo) | - |
| C16 | -- | -- | Not Used | - |
| D1 | BLU/WHT | 1231 | Transmission Input Speed Signal | - |
| D2 | GRY/BLK | 1694 | 4WD Low Indicator Signal | - |
| D3 | YEL/BLK | 1275 | APP (3) 5 Volt Ref. | - |
| D4 | DK GRN | 1163 | APP (3) Signal | - |
| D5 | GRY | 120 | Fuel Lift Pump Signal | - |
| D6 | GRY | 1273 | APP (3) Ground | - |
| D7 | BRN | 104 | Glow Plug Signal | - |
| D8 | DK GRN/WHT | 465 | Fuel Lift Pump Control | - |
| D9 | PNK/BLK | 632 | Pump CAM, High Res. and Fuel Temperature Ground | - |
| D10 | GRY/BLK | 87 | Cruise Resume/Accel Request | - |
| D11 | RED/BLK | 1230 | Transmission Input Speed Signal (Lo) | - |
| D12 | WHT/BLK | 1164 | APP (1) 5 Volt Ref. | - |
| D13 | GRY | 416 | Boost, CKP and BARO 5 Volt Ref. | - |
| D14 | GRY | 474 | Pump CAM and High Res. 5 Volt Ref. | - |
| D15-D16 | -- | -- | Not Used | - |
| - | - | - |
PCM Connector C2
| Connector Part Information | * | 12160778 | ||
| * | PCM 24 Way BRN (C2) Connector | |||
| Pin | Wire Color | Circuit No. | Function | |
| A1 | BLK | 491 | Closure Ground | |
| A2 | ORN | 1799 | High Res. Signal | |
| A3 | BRN | 437 | Transmission Output Speed Signal (OSS) | |
| A4 | BRN/WHT | 633 | Pump CAM Sensor Signal | |
| A5 | YEL | 573 | CKP Sensor Signal | |
| A6 | DK GRN | 389 | VSS Signal | |
| A7 | RED/BLK | 1031 | Injection Timing Stepper Motor (HI) | |
| A8 | TAN/BLK | 1030 | Injection Timing Stepper Motor (LO) | |
| A9 | ORN/BLK | 1032 | Injection Timing Stepper Motor (LO) | |
| A10 | YEL/BLK | 1033 | Injection Timing Stepper Motor (HI) | |
| A11 | GRY | 397 | Cruise ON/OFF Signal | |
| A12 | PPL | 1272 | APP (2) Ground | |
| B1 | BRN | 1271 | APP (1) Ground | |
| B2 | DK BLU | 1161 | APP (1) Signal | |
| B3 | BLK/WHT | 1695 | Front Axle Switch Signal | |
| B4 | RED | 1226 | TR Switch C | |
| B5 | DK BLU | 1225 | TR Switch B | |
| B6 | PNK | 1224 | TR Switch A | |
| B7 | -- | -- | PTO (1360 RPM) | |
| B8 | -- | -- | PTO (1070 RPM) | |
| B9 | PPL (A/T) | 420 (A/T) | Cruise Control Brake Switch (A/T) | |
| BRN/WHT (M/T) | 379 (M/T) | Brake/CPP Switch (M/T) | ||
| B10 | WHT | 17 | Brake Switch | |
| B11 | DK BLU | 84 | Cruise Set/Coast Signal | |
| B12 | BLK | 452 | Sensor Ground (Boost, ECT, IAT, Fuel Temp., TFT and CKP Sensor) | |
PCM Connector C3
| Connector Part Information | * | 12110207 | ||
| * | PCM 32 Way BLU (C3) Connector | |||
| Pin | Wire Color | Circuit No. | Function | |
| C1 | -- | -- | Not Used | |
| C2 | TAN | 1274 | APP (2) 5 Volt Ref. | |
| C3 | LT GRN | 260 | Fuel Inject Control | |
| C4 | LT GRN | 1222 | Shift Solenoid (1-2) | |
| C5 | BRN | 418 | TCC PWM | |
| C6 | YEL/BLK | 1223 | Shift Solenoid (2-3) | |
| C7 | DK BLU | 507 | Wait To Start Lamp Control | |
| C8 | PPL | 1807 | Class 2 Communication | |
| C9-C10 | -- | -- | Not Used | |
| C11 | PNK | 439 | Ignition | |
| C12 | PNK | 439 | Ignition | |
| C13 | ORN | 440 | Battery | |
| C14 | BRN/WHT | 419 | MIL Control | |
| C15 | -- | -- | Not Used | |
| C16 | -- | -- | Not Used | |
| D1-D2 | -- | -- | Not Used | |
| D3 | LT GRN/BLK | 260 | Fuel Inject Control | |
| D4 | -- | -- | Not Used | |
| D5 | DK GRN/WHT | 459 | A/C Enable | |
| D6 | BLK/WHT | 451 | Ground | |
| D7 | TAN/WHT | 551 | Ground | |
| D8-D10 | -- | -- | Not Used | |
| D11 | WHT/BLK | 176 | Service Throttle Soon Lamp Control | |
| D12 | -- | -- | Not Used | |
| D13 | ORN | 440 | Battery | |
| D14 | YEL | 258 | Wastegate Solenoid Control | |
| D15 | DK BLU/WHT | 259 | ESO Solenoid Control | |
| D16 | -- | -- | Not Used | |
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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