OBD-II code · Powertrain (generic)
P0804 Upshift/Skip Shift Lamp Control Circuit
General electrical fault on the upshift/skip-shift indicator lamp control circuit — the dashboard light that prompts the driver to skip from 1st straight to 4th. With the input invalid the lamp cannot be illuminated.
Is it safe to drive with P0804?
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 lamp wire
- PossibleFailed lamp bulb or LED
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
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.2–1 h
- Emissions test
- Usually unaffected
- Parts involved
- Skip Shift Lamp, Wiring Harness
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.