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 MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 4 (AUTOMATIC TRANSMISSION - 2ML70 - INTRODUCTION)SPECIFICATIONSRANGE REFERENCE
2009 Chevrolet Tahoe Base, 4.8 C
Range Reference
2009 Chevrolet Tahoe Base, 4.8 CSECTION Range Reference
WARNING: This page is about a different variant/trim than selected.
| Gear | Park | Reverse | Neutral | D | |||||
|---|---|---|---|---|---|---|---|---|---|
| P | EVT R | N | EVT Low | 1st | 2nd | 3rd | 4th | EVT High | |
| Shift Solenoid 1 | OFF | OFF | OFF | OFF | ON | ON | ON | ON | OFF |
| Shift Solenoid 2 | OFF | OFF | OFF | OFF | OFF | OFF | ON | ON | ON |
| Line PC Solenoid 1 N.H. | ON | ON/OFF* | ON | ON/OFF* | ON | ON | ON | ON | ON |
| PC Solenoid 2 Trim N.H. | OFF | OFF | OFF | OFF | OFF | ON | ON | ON | ON |
| PC Solenoid 3 Trim N.H. | OFF | ON | OFF | ON | ON | ON | OFF | ON | OFF |
| PC Solenoid 4 Trim N.L. | OFF | OFF | OFF | OFF | ON | OFF | ON | OFF | OFF |
| PC Solenoid 5 N.L. | OFF | ON/OFF* | OFF | ON/OFF* | OFF | OFF | OFF | OFF | OFF |
| 1-3 Clutch | - | - | - | - | A | - | A | - | - |
| 4th Clutch | - | - | - | - | - | - | - | A | - |
| Hybrid Low 1-2 Clutch | - | A | - | A | A | A | - | - | - |
| Hybrid Direct 2-3-4 Clutch | - | - | - | - | - | A | A | A | A |
| ON = the solenoid valve is energized. OFF = the solenoid valve is de-energized. A = Applied *When the internal combustion engine is running, the line pressure control solenoid is ON (pressurized) and the pressure control solenoid 5 is OFF (no pressure). When the internal combustion engine is OFF (auto stop), the line pressure control solenoid is OFF (no pressure) and the pressure control solenoid 5 is ON (pressurized). |
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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.