OBD-II code · Powertrain (generic)
P0790 Normal/Performance Switch Circuit
General electrical fault on the Normal/Performance shift-pattern selector switch — lets the driver toggle between a comfort-oriented and a sport-oriented shift map. Without a valid input the TCM defaults to the Normal map.
Is it safe to drive with P0790?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen or shorted switch wire
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
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Performance Switch, Wiring Harness
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.