C1241: Power supply voltage drop/rise
Short answer: C1241 means “Power supply voltage drop/rise”. Below is what it means on each of the 3 cars we cover, with a link to the full page for each car.
C1241 on each car
| Car | Meaning on this car | Confidence |
|---|---|---|
| Toyota Passo (1st gen) | Power supply voltage drop/rise (C1241/15) | high |
| Toyota Vitz (1st gen) | Low battery positive voltage | medium |
| Toyota Corolla (9th gen, E120) | IG Power Source Circuit (C1241/41) | high |
Symptoms
- Warning lamp per chart (see page)
Likely causes
- Power supply voltage drop/rise
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.