Fault code P0452 – a step-by-step guide to diagnosing and fixing it

Error code P0452 is displayed and the check engine light is on - what does this mean?

DTC P0452 is triggered by the OBD/EOBD system when the fuel tank pressure sensor reports a low signal. This fault code relates to the evaporative emission system (EVAP) and indicates that the fuel tank pressure sensor is operating outside the expected parameters.

What can cause this error code?

• Defective fuel tank pressure sensor
• Damaged or corroded cable connections to the pressure sensor
• Short circuit in the sensor wiring
• Loose or defective plug connections
• Defective fuel pump or fuel pump module
• Blocked or damaged EVAP lines
• Faulty engine control unit (ECM/PCM)
• Mechanical damage to the fuel tank

What symptoms occur in parallel with fault code P0452?

• Check Engine Light: The Check Engine Light illuminates continuously
• Fuel consumption: Increased fuel consumption due to inefficient EVAP function
• Fuel smell: Perceptible fuel vapors inside or outside the vehicle
• Starting problems: Occasional difficulties starting the engine
• Idle irregularities: Uneven engine running at idle
• Emission test: Possible problems with the emissions test

How can I fix the problem with error code P0452?

• Repairing trouble code P0452 requires a systematic diagnosis of the EVAP components.
• Replacement of the defective fuel tank pressure sensor with an original part or high-quality spare part
• Repair or replace damaged cable connections and plug connections to the pressure sensor with appropriate repair kits
• Cleaning or replacement of clogged EVAP lines and valves in the entire evaporative emission system
• Checking and, if necessary, replacing the fuel pump or the complete fuel pump module
• Professional diagnosis and repair of the engine control unit in the event of ECM/PCM faults by a specialist workshop
• Inspection and repair of mechanical damage to the fuel tank by qualified technicians