C0278: Solenoid relay open/short
Short answer: C0278 means “Solenoid relay open/short”. Below is what it means on each of the 3 cars we cover, with a link to the full page for each car.
C0278 on each car
| Car | Meaning on this car | Confidence |
|---|---|---|
| Toyota Passo (1st gen) | Solenoid relay open/short (C0278/11) | high |
| Toyota Vitz (1st gen) | ABS solenoid relay circuit (open) | medium |
| Toyota Corolla (9th gen, E120) | Open in ABS Solenoid Relay Circuit (C0278/11) | high |
Symptoms
- Warning lamp per chart (see page)
Likely causes
- Solenoid relay open/short
What to check, in order
- Follow manual section procedure for this code
Causes and checks above are the general meaning. The exact test steps and values differ by car: open your car’s page.