U0603

Symptoms

• The Check Engine light comes on
• The engine may run rough
• Reduced engine power
• Difficulty starting the engine
• Possible increase in fuel consumption

Causes

• Fuel pressure sensor A fault
• Open or short circuit in sensor wiring
• Poor connection in sensor or ECU connectors
• ECU malfunction
• Problems with the CAN data bus

How to Fix

1. Check the wiring and connectors of the fuel pressure sensor A for damage.
2. Check fuel pressure sensor A using a multimeter
3. Check the integrity of the CAN data bus
4. Check the ECU for damage or corrosion
5. Replace faulty components (sensor, wiring, ECU)

Related codes

Error U0603 by Vehicle Brand