Persistent PO740 Code on 1997 960

Discussion in 'Volvo 960' started by sos1967, Apr 12, 2007.

  1. sos1967

    sos1967 Guest

    After driving on the highway for some time above 55mph(80km/h) the up-
    arrow on my dashboard will suddenly begin to flash while at the same
    time, the winter/sports/economy lights on the drive mode selector
    switch begin to oscillate. The gear shifts fine without any problem.
    I got the car scanned at a local workshop and it came with error code
    PO740. Since then I have had the tranny changed, swapped ECM&TCM from
    a similar 960 that didn't have a tranny problem but the problem still
    persisted with the PO740 code.

    Any suggestions on what the problem could be?

    A point to note however is that the problem does not occur while
    driving at low speed.
    sos1967, Apr 12, 2007
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