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Loren

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Posts posted by Loren

  1. 1. Potential fault P0740 causes are:

    - ATF level not OK - check ATF supply

    - Torque converter clutch worn. - check torque converter

    - Mechanical damage to pressure regulator 4. - check pressure regulator 4 (hydraulic)

    - Open circuit, short circuit to ground, short circuit - check electrical triggering to pressure regulator 4 to B+.

    - Hydraulic control unit - check for sticking valves.

    2. Not all pcodes cause a CEL light.

    If the speedo signal problem is ABS related then you may have an ABS code. Unfortunately Porsche has not shared those codes with many companies so ABS can not be read with scan tools other than a PST2 or PIWIS. Your car can also generate code for Body faults - B code, C drivetrain faults - C codes, and U faults - for undefined (by SAE) faults. Porsche only publishes P codes.

    Some independent shops have invested in PST2 tools so perhaps one could read your full code faults for you (for a nominal fee). Either way you should try to identify and fix the P040 cause - which could be as simple as low ATF level.

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