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.
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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 561 (AUTOMATIC TRANSAXLE - 4T65-E (INTRODUCTION, SERVICE & REPLACEMENT))COMPONENT LOCATORAUTOMATIC TRANSMISSION INTERNAL CONNECTOR END VIEWS
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8
Automatic Transmission Internal Connector End Views
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Automatic Transmission Internal Connector End Views
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
1-2 Shift Solenoid Valve Connector, Wiring Harness Side Connector End View
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| A | RD | 839 | Ignition 1 Voltage |
| B | L-GN | 1222 | 1-2 Shift Solenoid Valve Control |
2-3 Shift Solenoid Valve Connector, Wiring Harness Side Connector End View
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| A | RD | 839 | Ignition 1 Voltage |
| B | YE | 1223 | 2-3 Shift Solenoid Valve Control |
Automatic Transmission Fluid Pressure Manual Valve Position Switch Connector, Wiring Harness Side
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| A | WH | 1804 | TCC Release Switch Signal |
| B | - | - | Not Used |
Input Speed Sensor Connector, Wiring Harness Side
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| A | D-GN | 1231 | AT ISS Low Signal |
| B | BK | 1230 | AT ISS High Signal |
Pressure Control Solenoid Valve Connector, Wiring Harness Side
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| A | PU | 1228 | PC Solenoid Valve High Control |
| B | L-BU | 1229 | PC Solenoid Valve Low Control |
Torque Converter Clutch Pulse Width Modulated Solenoid Valve Connector, Wiring Harness Side
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| A | RD | 839 | Ignition 1 Voltage |
| B | TN | 418 | TCC PWM Solenoid Valve Control |
Transmission Fluid Temperature Sensor Connector, Wiring Harness Side
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| A | BN | 1227 | TFT Sensor Signal |
| B | GY | 452 | Low Reference |
Transmission Internal Mode Switch Connector, Wiring Harness Side
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| A | OG | 1786 | Park/Neutral Signal |
| B | GY/WH | 776 | Transmission Range Signal P |
| C | YE/BK | 773 | Transmission Range Signal C |
| D | D-GN/WH | 772 | Transmission Range Signal B |
| E | RD/BK | 771 | Transmission Range Signal A |
| F | BK/WH | 1050 | Ground |
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:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.