P0819 — Up and Down Shift Switch to Transmission Range Correlation
The up-shift/down-shift paddle or button input is used in manumatic mode to step through gears, but the inputs only make sense when the gear lever is in Drive or the Manual position. The TCM detects an inconsistency — paddle commands while gear lever is in Park or Neutral.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Paddle shifters
- Gear lever switch
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Stuck paddle/button input
- Swapped wiring after service
Possible symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Diagnostic notes
- The malfunction indicator lamp may illuminate
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.