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 MANUALSCHEVROLET2007SUBURBAN C1500, 5.3 0REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1927 (AUTOMATIC TRANSMISSION - 6L80/6L90 - SPECIFICATIONS)SPECIFICATIONSTRANSMISSION FLUID PRESSURE SWITCH LOGIC
2007 Chevrolet Suburban C1500, 5.3 0
Transmission Fluid Pressure Switch Logic
2007 Chevrolet Suburban C1500, 5.3 0SECTION Transmission Fluid Pressure Switch Logic
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Transmission Fluid Pressure (TFP) Switch Logic
| Gear | TFP Switch States | |||
|---|---|---|---|---|
| TFP SW1 | *TFP SW3 | TFP SW4 | TFP SW5 | |
| Park | High | Low | Low | Low |
| Reverse | Low | Low | Low | Low |
| Neutral | High | Low | Low | Low |
| Drive 1st - Engine Braking | High | High | Low | Low |
| Drive 1st | High | High | Low | High |
| Drive 2nd | High | Low | Low | High |
| Drive 3rd | Low | High | Low | High |
| Drive 4th | High | High | Low | Low |
| Drive 5th | Low | High | High | Low |
| Drive 6th | High | High | High | Low |
| Drive 6th (Possible additional gear state) | High | Low | High | Low |
| High = 12V (Switch Open or Pressurized) Low = 0V (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.