The P1235 code in your 2022 Toyota Avalon indicates a malfunction in the fuel pressure regulator control circuit. This Toyota-specific code signals the ECU cannot properly control fuel rail pressure in the direct injection system.
Direct Injection Fuel Pressure
The Avalon's direct injection system operates at very high pressures (2000+ PSI). An electronic fuel pressure regulator controls this pressure precisely. P1235 indicates a control circuit problem.
Common Causes of P1235
- Fuel pressure regulator failure
- Fuel pump issues
- Wiring damage to regulator
- ECU driver circuit failure
- Fuel rail pressure sensor problems
- Contaminated fuel
Symptoms of Pressure Control Issues
- Check engine light on
- Hard starting
- Rough idle or stalling
- Poor acceleration
- Reduced power
- Fuel economy decrease
Avalon Luxury Expectations
The Avalon is Toyota's flagship sedan, expected to run smoothly. Fuel pressure issues noticeably affect the refined driving experience.