P1229 Fuel System Over Pressure
What does P1229 mean on a Toyota?
P1229. Fuel System Over Pressure. This Toyota-enhanced code applies to Camry, Corolla, RAV4 with returnless fuel.
Common causes of P1229
- Stuck fuel pressure regulator
- Blocked return path
- Biased pressure sensor reading high
- Shorted sensor signal
- Controller over-commanding the pump
How to fix P1229
- Verify pressure with a mechanical gauge
- Test regulator operation
- Check return path for blockage
- Validate the sensor against the gauge
- Replace the regulator or sensor per proof
Sources and review
- Last updated 2026-09-06.