Question about Mitsubishi Lancer

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Dear All, My Car is 2008 Mitsubishi Lancer GT malaysia version. Currently it appear an engine light on. After check with service center, they found is code P0840 secondary pressure CNC circuit. But they don;t know what is the solution. Can you advice me a solution to get it off.

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  • Ng Chee Keong Sep 09, 2010

    Thanks for the solution, can I clarify with you about few inquiry?
    1. Replace with engine oil or gear oil
    2. I have just replace all the gear oil but the engine oil still appear.
    3. The foremen ask mr to drive few day to monitor after replace the oil. Is it safe to drive while the engine light still appear?
    4. What is the impact for this problem? The foremen said the worst case is change gear box, is it true?

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The pressure in the hydraulic circuit of the transmission is low. First of all replace the oil and the filter. Then check the solenoids . If they are ok then the pump and the hydraulic lines for leaks.

Posted on Sep 06, 2010

  • Azrael SRL Sep 09, 2010

    To make the things a little more clearly : that light isn't an engine light, it's an warning light for engine AND gearbox. In your case this is strictly a gearbox problem, the engine is just fine and you don't have any reason to touch it in any way when dealing with that error code



    1. In the gearbox - strictly only gearbox oil.
    2. If that error code still appears then the problem hasn't been fully fixed - the solenoid has,t been replaced properly or the pipe that connect to it are clogged with dirt and must be cleaned.
    3. The can can be driven, but do not force it or the gearbox will be damaged.
    4. No, you don't need to replace the whole gearbox. In the worst case you will have to replace the entire valve body. That part should be available easily at a dealer.  

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