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406 Automatic gear fault

Hi,

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

Reply to
Tor
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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 engage.

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 problem!)

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

Reply to
Doug McKenzie

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

Sunny

Tor wrote:

Reply to
JohnSunny

Hi,

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

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!

Regards, Tor

Reply to
Tor

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