406 Automatic gear fault

Discussion in 'Peugeot 406' started by Tor, Jun 7, 2006.

  1. Tor

    Tor Guest


    My 2001 406 sometimes shocks, then the sport and snow lights starts
    flashing, there display shows 'Automatic gear fault', and the gear box
    is stuck in third gear. If I turn off and start the engine, it seems OK.
    It might be weeks between this happens, or it might be several times
    in a few minutes.

    My Peugeot dealer had never heard about problems with the automatic
    transmission(!). They've upgraded the transmission software, and this
    didn't solve the problem.

    Is there a simple solution to this problem, or is replacement or
    overhaul of the transmission necessary? (I've seen something about
    replacing one or more valves, but not which valves or how complicated
    this operation is).

    Best regards,
    Tor, Jun 7, 2006
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  2. Hi

    I have a 2003 307 Wagon.

    I bought it about 15 months ago as a 'demo' model -with only 8000 km on the
    clock. Soon after getting it, it kept producing the 'Automatic Gear Fault'
    display, and it obviously had a problem - it would hesitate/shudder around
    55/65 kmph as though the auto transmission couldn't decide which gear to

    The transmission was replaced under warranty - the diagnosis had something
    to do with the 'torque detector' (I think that was the name given to the

    However, just recently, several times the 'Automatic Gear Fault' warning has
    again been displayed - this time after decelerating or accelerating at slow
    speeds - sometimes with an audible 'clunk' or shudder.

    I am due for a 40000 Km service in a week or so, but would like to have some
    idea of what is likely to be the cause. It is now just over 12 months since
    the first transmission/gearbox was replaced. Would this be under a separate
    warranty from the car warranty which has now expired, and is it likely that
    any repair/replacement would be free of charge?

    Doug McKenzie, Jun 13, 2006
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  3. Tor

    JohnSunny Guest

    Hi Tor,

    I have similar problem as you describe. Since this problem trouble me a lot,
    I asked my dealer to solve the problem. The dealear asked me to change my ECU
    of the transmission. It is very expence. So I search in Internet. Someone
    help me by doing following steps and it works.

    Step1: Disconnect the negative wire from your car battery.
    Sep2: Disconnect the wires in ECU of transmission.
    Step3: Wait for 5 minutes
    Step4: Connect the wires back to their postion.
    Step5: Connect the negative wire back to your car battery

    JohnSunny, Jun 21, 2006
  4. Tor

    Tor Guest


    I didn't get to try the simple solution before the professionals got the

    The blinking of the S and Ice lamp + the gear stuck in 3rd gear, is the
    emergency mode of the gear box. This indicates an automatic gear fault,
    but it doesn't state what kind of automatic gear fault.

    The diagnose system of my car, indicated a problem with two of the shift
    valves. (There are 7 or 8 shift valves). These two valves was replaced,
    and this solved the problem. This could be done with the gear box in the
    car, but it was quite expensive anyway.

    There have been a number of faults with these valves, and Peugeot are
    now using a different kind of valves!

    Tor, Jun 30, 2006
  5. Tor


    Nov 11, 2012
    Likes Received:
    Peugeot 406 Gear Box Problem. My car also jumps into safe mode (3rd) gear usually when I remove foot from pedal to slow down or increase power for an incline.

    I've been sold a ECU (£150)(lasted 4-5month) and now going to have "oil pressure regulator" changed for another £100.

    The dealer wants £100 for every diagnostic check and wants to sell a new gearbox that costs more than the car would be. -- Last Chance -- Ray
    sandstone, Nov 11, 2012
  6. Tor

    Hassan mohammed

    Oct 1, 2020
    Likes Received:
    My Peugeot 406 v6 automatic gear when am on speed if I remove leg from torture is miss deselecting
    Hassan mohammed, Oct 1, 2020
  7. Tor


    Oct 3, 2020
    Likes Received:
    Good, evening all, i am requesting for information: my 406 2002 AUTAMATIC Car, has problem of continues blinking of S and * lights beside the "gear lever position indicators". Whenever these 2 lights are blinking the car becomes too heavy to drive. please what is the solution to this problem?
    umtela, Oct 3, 2020
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