My 4 year old Citroen C4 2 litre tiptronix has been fine until fairly recently...Over the past 3 months it has been going into 3rd gear of its own accord.After the first time of this happening we went straight to the local Citroen garage who downloaded the electronic memory etc,but could find nothing wrong!...I have found that I can temporarily clear the problem by stopping,switching off and then starting again,driving forward and reverse by manually selecting the gears...A further thorough overhaul by the garage still resulted in no fault showing up!..The fault has now occured 8 times!!..Any ideas as to what the cause may be or any advice at all would be greatly appreciated!!!!!
I've got a 56 reg C4 1.6 with exactly the same problem and I've found others on the web as well.
It puts itself into 3rd from any gear resulting in an uncomfortable lurch into 3rd. I have found that it happens usually in the first 5-10 mins of starting up, even to the point where it can occur at the same point on your journey. I just switch off and that resets it. However sometimes it can happen about 3 or 4 times before the problem seems to go away.
Sometimes you can go for about a month with no symptons before it comes back.
As it is out of warranty I have been reluctant to go to the dealer as when I have spoken to the dealer and other garages it is always the same reply "we'll check the diagnostics" - but as you know it doesn't show any faults.
I had a similar problem with a Hyundai and it was fixed after they changed the oil and flushed it through, although it was under warranty so they had tried lots of other things first.
I have asked garages if they can do an oil change but they are not interested - always want to charge for the diagnostic check first before they'll do anything.
I'd be interested to know if you get a solution to the problem.
Check the battery voltage, Citroën electronics are notoriously sensitive to low voltage conditions, if the battery is showing less than 12.6V (everything off) then a new battery might be a good idea, similarly any electrical noise can cause havoc, clean up the terminals on the alternator and check the alternator plug and wiring are in good shape along with the earth strap. The diode pack in the alternator failing can produce electrical noise which will upset the gearbox electronics, If you haven't got a friend with a sensitive (fast) oscilloscope to check it out, you could try fully-charging the battery then running the car without the alternator plugged in for 30 mins or so to see if the problem disappears.
Other than that, unplug, spray with contact cleaner, (wait to dry) then replug in all the ECUs and sensor connectors you can lay your hands on. You might stumble across the problem. Uunless it's a well-known and documented fault the dealers will be as much use as a chocolate teapot.
I have a similar problem with a 1.6 litre C4. When the car is driven off for the first time each day, inside 2km, if the speed exceeds 80Km per hour the auto gearbox drops from fourth to third with a very disconcerting jolt. Service advisory appears. Come to a halt. Switch off the engine. Start again immediately. Problem disappears.
Does anyone have a similar experience? Is there a remedy?
I have the same problem, My car is a C4 1.6SX 2006. Citroen garage says it needs new gearbox but as it had a new one a year ago I doubt this. I have been told that the problem is with the electro valves in the gearbox and those who have replaced them have so far found no problems. Citroen deny this is a problem with this vehicle.
Citroen dealer says they will not do do this job preferring to replkace the whole box. They recommended finding a small garage. Perhaps your Citroen dealer might be more reasonable. it is a 5hr job, the part is under £50 I think, so budget for about £4-500. Still cheaper than a new gearbox. Good Luck!
Same car, same problem exactly. Car drops from 4th to third with a disconcerting clunk inside 2km and in a shorter distance if its an uphill grade. My guess is that it is related to the temperature of the oil and the setting of a valve because you can hear the oil moving while engine is off and car is at rest. Dealer says replace the box but its miore than the car is worth. Manufacturer needs to acknowledge the problem or they will not sell a lot of cars. Big pity, its otherwise an attractively designed economical and comfortable car.
>> an attractively designed economical and comfortable car.
If it's prone to gearbox failure it is not "economical". The reason that manufacturers get away with this sort of thing is that too many people focus exclusively on fuel costs rather than TCO over time.