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 PASSENGER EXTENDED, 5.0 MREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 977 (AUTOMATIC TRANSMISSION - ALLISON - COMPONENT LOCATOR)COMPONENT LOCATORAUTOMATIC TRANSMISSION RELATED CONNECTOR END VIEWSTRANSMISSION CONTROL MODULE (TCM) C1
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 M
Transmission Control Module (TCM) C1
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 MSECTION Transmission Control Module (TCM) C1
WARNING: This page is about a different car, the 2001 GMC Sierra, 2001 GMC Cab & Chassis Sierra, 2001 Chevrolet Silverado, and 2001 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Transmission Control Module (TCM) C1
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| 1 | BLK/WHT | 451 | Ground |
| 2 | PNK | 1020 | Off/Run/Crank Voltage |
| 3 | ORN | 440 | Battery Positive Voltage |
| 4 | PNK | 1020 | Off/Run/Crank Voltage |
| 5 | BLK/WHT | 451 | Ground |
| 6 | YEL | 2522 | Power Take Off (PTO) Reference Voltage |
| 7 | PPL | 420 | TCC Brake Switch/ Cruise Control Release Signal |
| 8 | - | - | Not Used |
| 9 | WHT | 2467 | Unmanaged Torque Signal |
| 10 | GRY/BLK | 1694 | 4WD Low Signal |
| 11-15 | - | - | Not Used |
| 16 | TAN/BLK | 464 | Delivered Torque Signal (Gas Only) |
| 17-21 | - | - | Not Used |
| 22 | ORN/BLK | 463 | Requested Torque Signal |
| 23-24 | - | - | Not Used |
| 25 | DK BLU | 2687 | Transmission MIL Request Signal |
| 26 | - | - | Not Used |
| 27 | YEL | 400 | Signal High - Front |
| 28 | - | - | Not Used |
| 29 | YEL | 2361 | CAN Data Link Signal HI |
| 30 | YEL | 2470 | Class 2 Serial Data |
| 31 | - | - | Not Used |
| 32 | DK GRN | 2362 | CAN Data Link Signal LO |
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.