Transmission Fluid Pressure Switch Logic
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. 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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