Help with P1645 code and check engine light

Discussion in 'Dodge Challenger SRT Hellcat' started by Link, Jul 3, 2016.

  1. Link

    Link Silver Member

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    Added new pcm, at first threw a p1645. Little to no throttle response.
    Started car second time and no codes, just check engine light stays on. Drove car up the street and back, seemed fine.
     
  2. fnkychkn

    fnkychkn swollen member Gold Supporting Member

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    is this a new Mopar PCM with OE programming or was it supplied by a tuner?


    P1645-SUPERCHARGER BYPASS VALVE ACTUATOR CONTROL SYSTEM - UNABLE TO CLOSE

    Theory of Operation

    The Supercharger boost pressure is managed by the use of a Supercharger Bypass (SCB) Valve. The PCM can vary the position of the SCB Valve to control the amount of boost. The SCB system uses two Position Sensors to monitor the SCB blade position. Position Sensors are located within the SCB Valve assembly. Each sensor has its own Signal circuit. Both sensors share a 5-Volt reference circuit (Supply) and a low reference circuit (Sensor Return). The Powertrain Control Module (PCM) monitors the SCB Valve Sensor data. Each Signal circuit provides the PCM with a signal voltage proportional to SCB blade movement. The PCM monitors the data to verify that the indicated SCB position is correct.


    When Monitored and Set Conditions

    When Monitored: This diagnostic runs when the following conditions are met:




      • With the ignition on.
      • The air charge temperature is above -10°C (14°F).
      • Supercharger Bypass Valve Self Learn procedure completed.

    Set Conditions:




      • When the Powertrain Control Module (PCM) detects that the Supercharger Bypass Valve is not in the correct position when checked during the opening spring return test for 0.6 seconds.

    Default Actions:




      • The MIL light will illuminate.
      • The ETC light will flash.


    Possible Causes
    COKING OR BLOCKAGE OF THE THROTTLE PLATE
    SUPERCHARGER BYPASS VALVE

     
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  3. Link

    Link Silver Member

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    Ths is the new HHP pcm, should I try disconnecting battery, then take it for a short drive
     
  4. Link

    Link Silver Member

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    ok, disconnected battery for a few and then reconnected. Check engine light went away. Drove around about a mile with no issues. WOt seemed fine as well. I only did WOT for a sec. I will see if everything stays cool. Thx Funky
     
  5. Link

    Link Silver Member

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    Drove to work this am and everything seems fine, knock on wood.
    THX for the info.
     
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  6. MABBRYFL30

    MABBRYFL30 NYS President Hellcat Car Club Gold Supporting Member

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    We are not as informed if you don't post this for us. Great post FC
     
  7. sgoyal

    sgoyal Gold Member

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    I'm glad to know that since I'm expecting my PCM this week. I'll disconnect the battery then hook the new pcm.

    Keep us updated how it's going and can't wait to see real number once it's all tuned
     

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