P088EPlanetary Gear Set Failure
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- P088E means the module has found that a planetary gear set no longer keeps the fixed speed relation between its sun, carrier and ring gear, for example through broken planet gears, seized planet pins or stripped teeth. No maker's table or bulletin documents the code. It suits power-split hybrid transmissions, which measure speeds at several members: a Toyota patent compares the road speed calculated from engine, generator speed and planetary ratio with the measured one, flags a deviation of about 10 km/h for about 1 s and then drives electrically only. In stepped automatics such damage usually shows as ratio or slip codes.
- What you may notice
- Grinding or whining from the gearbox
- Power loss, limp mode (hybrids drive electrically only)
- Possibly no drive
- Likely causes
- LikelyPlanet gears or pins seized or broken (lubrication, overheating)
- PossibleTooth damage on sun or ring gear
- PossibleSpeed sensor (engine, motor-generator, output) reading wrong
- RareLow or worn fluid
- Repair
- Hard · Usually a job for a workshop.Typical cost: €1,500 – €6,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.