Gearbox not staying in 4th

If you have Automatic gearbox problems or issues that would only affect an Auto, please ask here.

Please provide as much information as possible including photos you have taken and uploaded directly to the topic.
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One question per topic about an Auto or semi-auto gearbox can be posted in this section
No engine questions
Think: Auto not changing up or down, snowflake/sport flashing, flappy paddles, actuator fault and sensodrive not changing gear.
My Name: GreenC3

Member
Posts: 2
Joined: Wed Jul 25, 2018 8:38 pm
Model: C3 2002-2005, Original shape model
Year: 2004 (54)
Engine Size: 1.4 (16v)
Fuel Type: Petrol
Mileage: 161000
Trim Level: SX
Gearbox: Automatic PRND
DPF: No
LHD or RHD: RHD (UK)

Post

The car changes gear as normal until changing from 3rd to 4th. It changes up then drops back down to 3rd then up and down continuously. Have tried speeding up to above 50 but it is the same. Have tried a replacement ECU which did improve smoothness of changes but problem is still there. We have been advised that possibly only solution is replacement box but this is not really an option considering the cost and the age of the car. Anyone else had similar problem. Thanks
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My Name: C3CAR

Guru
Posts: 2621
Joined: Wed May 04, 2011 10:01 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 140000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
Has thanked: 148 times
Been thanked: 88 times

Post

Have you tried changing the ATF. The automatic transmission fluid colour you drain out can give you indication of the internal components of the gearbox. Even the quantity you drain out gives you a clue to what is happening.

Refill with this LT71141 (here) for the AL4 style box.
My Name: GreenC3

Member
Posts: 2
Joined: Wed Jul 25, 2018 8:38 pm
Model: C3 2002-2005, Original shape model
Year: 2004 (54)
Engine Size: 1.4 (16v)
Fuel Type: Petrol
Mileage: 161000
Trim Level: SX
Gearbox: Automatic PRND
DPF: No
LHD or RHD: RHD (UK)

Post

Thanks but fluid was changed a few months ago and was checked earlier this week. We have had the car about 3 years and have only put about 10,000 miles on in this time.
User avatar
My Name: C3CAR

Guru
Posts: 2621
Joined: Wed May 04, 2011 10:01 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 140000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
Has thanked: 148 times
Been thanked: 88 times

Post

You didn't say the fluid had been changed. You also don't say why it had been changed.
Do you know the state of the oil drianed from the box?
You have been advised to replace the gearbox. A replacement is often cheaper than a rebuild.

Looks to me like you will be getting a replacement auto box.
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