Hi, I wondered if the forum can help me. My son has a Fabia Monte Carlo Mk3 1.2 TSI manual. It had a gearbox rebuild by Skoda earlier this year. When we got the car back the stop/start wasn't working and we noticed that the gear indicator on the dash did not recognise when the car was in 5th gear, it only went up to 4th. Skoda believe the two things are connected. They've had it back three times, to replace the gear selector lever, and replace the gear selector electronic switch that sends the signal t the ECU when you change gear. Neither of these have worked.
Any ideas what else the issue could be? 

Edited 30 October, 20241 yr by Richard120

34 minutes ago, Richard120 said:

Any ideas what else the issue could be?

Weak battery?

The battery has been charged and tested. We know it’s healthy so it’s not the cause, but thanks 

also the gear selector error is not linked to the battery strength, 

Edited 30 October, 20241 yr by Richard120

4 hours ago, Richard120 said:

manual

I believe that the car works out what gear you are in by comparing the road speed and engine revs and calculates it from this.

eg at 54 MPH at 2K rpm the car will be in 5th gear with my Fabia.

 

If you put the car in any gear with the ignition on but the engine not running it won't know what gear you are in.

 

In a car with a slipping clutch you can see the gear indicator changing down but without you changing gear because the revs are rising but not the speed.

 

Thanks. AG Falco

Thanks and that may be the case in some cars but in ours it simply tells you which gear you’re in, not which gear you should be in. For example when you’re on the motorway at 70mph and you select 5th gear the car tells you you’re still in 4th 

Edited 30 October, 20241 yr by Richard120

4 minutes ago, Richard120 said:

Thanks and that may be the case in some cars but in ours it simply tells you which gear you’re in,

 

12 minutes ago, AGFalco said:

If you put the car in any gear with the ignition on but the engine not running it won't know what gear you are in

If you put your car in any gear ( except 5th ) with the ignition on but the engine not running, will it tell you what gear you are in?

 

Thanks. AG Falco 

I’d need to check that. The cars currently back at Skoda dealer. The first 4 gears work fine, it just doesn’t recognise when you’re in 5th gear 

Edited 30 October, 20241 yr by Richard120

They've probably buggered something on the gearbox or more likely the removal or reinstallation of the gearbox and it looks like (of course I could be wrong) instead of full and proper inspection and full and proper diagnosis they might have (of course I could be wrong) just fired the parts-cannon at it.  It needs proper full scanning and errors that show up investigating and integrating to see what's related, live data diagnosed, visual and physical checks of the gearbox and area and any other items and areas also that might be involved or nearby the work.  All very obvious stuff but it needs doing rather than avoiding or neglecting.

 

If the car has been back three times and two sets of parts fitted that haven't solved the problem then it might be time for your soon to "escalate" the matter and get VWŠkoda involved at a higher level of technical and management.

 

I agree, thanks for the advice 

Usually there is just one switch on the gearbox which operates when the car is in any gear (to stop the start/stop from starting the engine when in gear) rather than a switch for every gear.

 

A problem with the switch, linkage or wiring would cause the start/stop issue so sort this out first and maybe the other 'gear selected' issue is just a quirk of this not working correctly.

Edited 31 October, 20241 yr by SuperbTWM

I'm wondering if they haven't set up the gearbox correctly.  They will have a procedure (actuated via diagnostics) to calibrate the the gearbox after any work so that it knows which gear it is in and performs as it should.  Perhaps the gearbox calibration hasn't been done or more likely couldn't be done for some reason.  The system will not allow calibration of any controller which it thinks has a fault.  It might be that one of the many (sometimes simple) things that can prevent the start/stop from working is also preventing the correct set up of the gearbox.  

Edited 31 October, 20241 yr by Rheumy

1 hour ago, Rheumy said:

It might be that one of the many (sometimes simple) things that can prevent the start/stop from working is also preventing the correct set up of the gearbox.  

For gearbox calibration related to start/stop could it be as simple as the engine not being warm enough for start/stop activation?

 

Or off course start/stop as put is inactive for many reasons, battery in a lower state of charge than the start/stops wants is common of course, or the computer thinking this whether it is or isn't uncommon but possible by itself or with other info or false info it gets.  The more complex the system the more trip hazards and loopholes and holes in it.  As put in another post (in another thread about a different issue) perhaps the data logs from setting up the gearbox should be looked at and checked thoroughly.   I got annoyed only last night setting up an email link that just wouldn't, as I'd fat-fingered the letter e to er, if I'd worn my glasses for the stupidly small textbox  (luckily my wife pointed out my error when I asked her to check the details),  I'm looking at doing VCDS long coding next before I put in for a job as a VWŠkoda technician. 😁 (an unfair generalisation I know)

On 30/10/2024 at 19:29, AGFalco said:

If you put the car in any gear with the ignition on but the engine not running it won't know what gear you are in.

Except reverse.?

 

Thanks. AG Falco