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 CARSECTION 633 (AUTOMATIC TRANSMISSION - 2ML70 - SPECIFICATIONS)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 car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
Transmission Fluid Pressure Switch Logic
| 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.