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)SPECIFICATIONSTRANSMISSION FLUID PRESSURE SWITCH LOGIC
2009 Chevrolet Tahoe Base, 4.8 C
Transmission Fluid Pressure Switch Logic
2009 Chevrolet Tahoe Base, 4.8 CSECTION Transmission Fluid Pressure Switch Logic
WARNING: This page is about a different variant/trim than selected.
| Gear | TFP SW 1 | *TFP SW 3 | TFP SW 4 | TFP SW 5 |
|---|---|---|---|---|
| M1 (48 km/h (30 mph)) | Low | Low | Low | High |
| M2 (48 km/h (30 mph)) | Low | Low | Low | High |
| M3 (48 km/h (30 mph)) | Low | Low | Low | Low |
| M4 (48 km/h (30 mph)) | High | High | High | High |
| Power OFF | Low | Low | Low | Low |
| High = 12V (Switch Open or Pressurized) Low = 0 volts (Switch Closed or No Pressure) Note: All TFP switches are normally closed (NC) *TFP switch 2 does not exist |
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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.