U0603Lost Communication With Fuel Pressure Sensor A
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Fuel pressure sensor A reports fuel or rail pressure, which the controller needs for injection quantity and pump control. When the sensor is digital, it transmits over a point-to-point SENT line instead of an analog voltage, and U0603 means its frames no longer arrive in usable form: wire open or shorted, signal stuck high or low, CRC errors or an internal sensor fault. No manufacturer documents this code publicly; Ford's 2023 diesel and 2024 gasoline summaries show the same pattern for other SENT sensors (U0600, U0601) with 5 s to register. CARB 1968.2 demands a dedicated code for lost communication on such inputs. P0190 covers circuit faults of an analog sensor, U0604 the second sensor. Expect a fallback pressure strategy, rough running or no start.
- What you may notice
- Check engine light on
- Reduced power or limp mode
- Hard start, stalling or no start
- Likely causes
- LikelySENT signal, 5 V supply or ground wire faulty
- PossibleFuel pressure sensor electronics failed
- PossibleLoose, corroded or fuel-contaminated connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.