CitroenChat.com - Singapore Citroen Community  

Go Back   CitroenChat.com - Singapore Citroen Community > Model Specific Discussions > C4

Reply
 
Thread Tools Display Modes
Old 01-02-2011, 08:24 AM   #1
AE121
Regular
 
AE121's Avatar
 
Join Date: May 2007
Posts: 285
Default "Service" light on - Gearbox Faulty

Last Fri, just as I was driving out of my office, my beloved C4 gave me a 'beep' and the "service" light came on. Then I saw "gearbox faulty" in the display.

I was kinda stuck at the 3rd gear and I tried to downshift using the manual mode to no avail. I slowed down and eventually stopped at the traffic light and tried to use the sequential shift mode again but it did not work at all.

I re-started my car and the problem seemingly was resolved but I can feel the jerkiness in the gearbox.

The following day, I sent the car to CnC. They told me I would need to send it back another day to hook up "Info Rapid" to further diagnose the problem. Preliminary assessment is some sensor/valve is faulty and thus sends wrong signal to the computer. Service adviser also mention that the car will probably stay a few days with them if there is really the need to change the part(s).

PS. Service Adviser says that if change will change every sensor/valve
AE121 is offline   Reply With Quote
Old 01-02-2011, 09:03 AM   #2
voyager
Capitaine
 
voyager's Avatar
 
Join Date: Jan 2006
Posts: 6,423
Default

i am really sorry to learn this, AE121.
__________________
2003 C5 2.0
2005 C4 1.6 (dad's)
2006 C5 2.0
2010 C5 2.0 WiFi
2013 DS 5 1.6THP WiFi
2015 C4 Cactus 1.2
2016 (2014) C4 Picasso 1.6 e-HDi
voyager is online now   Reply With Quote
Old 01-02-2011, 09:12 AM   #3
flee19
Regular
 
Join Date: Aug 2010
Posts: 303
Default

Seems to be a common problem. They will replace the valve and it will be fine.
As for the "3rd gear stuck" thingie, I was told it's a built in safety mechanism (cant rem the exact description), but when this happens, the highest gear u can engage will be 3rd gear. Still safe to carry on driving to CnC.
flee19 is offline   Reply With Quote
Old 01-02-2011, 10:10 AM   #4
AE121
Regular
 
AE121's Avatar
 
Join Date: May 2007
Posts: 285
Default

Quote:
Originally Posted by flee19 View Post
Seems to be a common problem. They will replace the valve and it will be fine.
As for the "3rd gear stuck" thingie, I was told it's a built in safety mechanism (cant rem the exact description), but when this happens, the highest gear u can engage will be 3rd gear. Still safe to carry on driving to CnC.
sigh... but then.... can't move off from traffic light....
AE121 is offline   Reply With Quote
Old 01-02-2011, 10:16 AM   #5
teoaw
Junior Member
 
Join Date: Jan 2011
Posts: 5
Default

Quote:
Originally Posted by AE121 View Post
sigh... but then.... can't move off from traffic light....
Maybe can find out more from technical Q an A, if your gearbox is AL4.
teoaw is offline   Reply With Quote
Old 06-02-2011, 09:31 PM   #6
seroyen
Member
 
Join Date: Oct 2010
Posts: 34
Default

Hi AE121 and everyone else, this is my first post.

Sorry to hear about your problem. If your transmission (presumably AL4) switches to permanent 3rd gear, it is known as the downgraded mode. This prevents any serious damage to the gearbox in the event of a detected fault. The car should not be driven in excess of 100kph.

Like what CnC has suggested, I believe it is the problem with the pressure modulating electrovalves. It is a known problem that these original electrovalves installed before 2005 (if not mistaken) on AL4 gearboxes fail prematurely. New electrovalves from 'Borg Warner' are used and should last you longer than your previous ones did.

When the electrovalve(s) fail, the gearbox is unable to regulate the pressure to the correct value, and that explains why the system detects the discrepancy and warns you of a gearbox fault.

I would suggest you ask CnC service advisors to double or even triple check with the diagnostic tool. Since you are paying the fee for the diagnostic tool and software to be used, request them to plug in the tool before they test drive, and after they test drive. This will minimize chances of wrong fault diagnosis leading to unnecessary repairs. That was what had happened to me last time, wasting both my time and $1k+ in useless parts.

Another humble advice: After a gearbox-related repair, move through all gear positions, ensure they are not loose. Then, test drive around the service centre for about 3 rounds starting from normal to more aggressive driving (pedalling not steering! ) . Floor the accelerator once and ensure the kick-down function works. Notify immediately of any problems. It happened to me twice and I've learnt my lesson.

Hope your service experience will be a pleasant one!
seroyen is offline   Reply With Quote
Old 07-02-2011, 11:53 PM   #7
AE121
Regular
 
AE121's Avatar
 
Join Date: May 2007
Posts: 285
Default

thanks seroyen
AE121 is offline   Reply With Quote
Old 10-02-2011, 09:01 AM   #8
tjpang
Junior Member
 
Join Date: Jan 2010
Posts: 25
Default Gearbox Jerk

Quote:
Originally Posted by AE121 View Post
thanks seroyen

Hi, I were also having the same problem for few months. Finally, night mare came, the gear shift has strong jerk and the noise is like football spinning in the washing machine. CNC has been the servicing agent, but the billl always gave me heartattack. So thinking this time will be the DOOM day!!!! But i found one shop in SIN MING (BCC.SG) that does conti car, so gave it a try three days ago. To my surprise, superb service and reasonable cost (compare to CNC). Only realised its the mounting issue...so got the mounting changed, and now everything is fine. Even the shift gear from 1st to 2nd, does not experience any jerk at all. Hope it helps. Thanks
tjpang is offline   Reply With Quote
Old 10-02-2011, 10:34 AM   #9
AE121
Regular
 
AE121's Avatar
 
Join Date: May 2007
Posts: 285
Default

Quote:
Originally Posted by tjpang View Post
Hi, I were also having the same problem for few months. Finally, night mare came, the gear shift has strong jerk and the noise is like football spinning in the washing machine. CNC has been the servicing agent, but the billl always gave me heartattack. So thinking this time will be the DOOM day!!!! But i found one shop in SIN MING (BCC.SG) that does conti car, so gave it a try three days ago. To my surprise, superb service and reasonable cost (compare to CNC). Only realised its the mounting issue...so got the mounting changed, and now everything is fine. Even the shift gear from 1st to 2nd, does not experience any jerk at all. Hope it helps. Thanks
i have heard that BCC specialise in french marque... but reviews are pretty differentiated....

anyone one else been to bcc?
AE121 is offline   Reply With Quote
Old 24-05-2011, 11:48 AM   #10
AE121
Regular
 
AE121's Avatar
 
Join Date: May 2007
Posts: 285
Default

sigh...

recently, whenever i come to a stop, the gear indicator will jump to 1 (as usual)... then there will be a jerk and loud 'thud'... i think that was when gear 1 is connected again...

this was the symptom which i had before i replaced the electro valves and multi-function panel.

now, barely half a year after i replaced the above mentioned, the gearbox is acting all funny again
AE121 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +8. The time now is 07:46 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Citroenchat.com is not affiliated with CitroŽn or any other commercial company. "Citroen", its logos, and model names are registered trademarks of PSA.