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 MANUALSCHEVROLET2001SUBURBAN C1500REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 52 (AUTOMATIC TRANSMISSION - ALLISON - COMPONENT LOCATOR)COMPONENT LOCATORAUTOMATIC TRANSMISSION RELATED CONNECTOR END VIEWSTRANSMISSION CONTROL MODULE (TCM) C1
2001 Chevrolet Suburban C1500
Transmission Control Module (TCM) C1
2001 Chevrolet Suburban C1500SECTION 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 |
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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.