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CEL: Check Engine Light Codes and Info - Page 8
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Thread: CEL: Check Engine Light Codes and Info

  1. #71
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    From another Fiat500USA thread post:

    P2262 cel - turbo boost pressure not detected

    Explanation of P2262-00: Turbo Boost Pressure Not Detected - Mechanical

    Theory of Operation
    When the accelerator is closed suddenly, excessive boost pressure can build up between the Turbocharger and the Throttle Body which can cause damage to the Turbocharger. This can occur because the compressed air created by the Turbocharger has no place to go. This results in compressor surge.

    The Powertrain Control Module (PCM) detects this pressure increase via input from the Boost Pressure Sensor. The Boost Pressure Sensor operates as a typical three wire sensor. The PCM provides a 5–volt supply and sensor return circuit to the Boost Pressure Sensor and receives a feedback voltage on the signal circuit. The Turbocharger Surge Valve is responsible for venting the boost pressure between the Turbocharger and Throttle Body during sudden deceleration. The Turbocharger Surge Valve is normally spring loaded closed. When the PCM receives an input signal from the Boost Pressure Sensor that the pressure is above a calibrated amount, the PCM grounds the Turbocharger Surge Valve Control circuit which electrically opens the valve and routes the excess pressure between the Turbocharger and the Throttle Body back to the inlet of the Turbocharger, relieving the pressure and preventing compressor surge.

    • When Monitored:
    With the engine running and the Wastegate Valve is commanded closed or is open at a value less than 100%.

    • Set Condition:
    The difference between the Powertrain Control Module (PCM) (modeled position minus the actual position) is
    greater than 30 kPa (4.35 PSI).


    Possible Causes


    • RESTRICTED AIR FILTER
    • BOOST SYSTEM PRESSURE HOSES RESTRICTED OR LEAKING
    • LARGE INTAKE SYSTEM LEAK OR RESTRICTION
    • INTERCOOLER LEAK
    • EXHAUST SYSTEM RESTRICTION
    • WASTEGATE SOLENOID
    • WASTEGATE VALVE STICKING OPEN
    • TURBOCHARGER (SEIZED TURBINE)

  2. #72
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    P0456, p0441

    2015 Fiat 500 Pop, automatic transmission. Codes P0456 EVAP System-small leak and P0441 EVAP System-incorrect purge flow. I replaced the gas cap with an OEM correct one hoping it would at least get rid of the “small leak;” no help. I then replaced the Vapor Canister Purge Valve Mopar 4892890AA, cleared the messages and CEL has remained off.

  3. The Following User Says Thank You to nestorosix For This Useful Post:

    Tedolph (02-20-2020)

  4. #73
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    Update- my p1456 leak code cleared itself. I just ran my finger around the gas cap gasket and the inside of the neck of the fuel filler tube and the code cleared itself.

    Tedolph

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