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2.7HDi V6 Auto Gearbox Jerky Shifts

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smihaialex   
Tue Jul 01 2014, 03:07pm
Joined: Sep 18 2012
Member No: #1031
Location: Bucharest
Hey guys,

Long time no see... I have a bit of an odd one for you...

The automatic gearbox on my C6 (2006 built-2007 registered 2.7HDi Exclusive) is acting up...

The first symptom that I noticed as far back as 5 months ago were rev-ups higher than usual somewhere between 1st and 2nd - it's like you start rolling from let's say a traffic light, applying only gentle pressure to the throttle, and all of a sudden, somewhere between the 1st and 2nd speed the engine just revs up as if you had accidentaly taken the lever to neutral while still having your foot on the gas, and then it shifts and then it picks it up - but the shift is pretty jerky - there's a slight stutter when it picks up the 2nd speed... And this usually happens after driving in traffic or after driving a bit more aggressively for even a short while, but not too aggressively...

Now, the next symptom, which is only happening for a few weeks, but I think it is connected, is this... After driving a bit more agressively, but not overly aggressive - it's not my style and I personally think the C6 is not the car for that... Well anyway, after a period of slightly more aggressive driving - overtaking, maybe gunning it at a bit after a traffic light turns green, stuff like that, when I get home and I put it in reverse to park it, it doesn't engage reverse at first, but then when it does, there's a strong jerk and a noise - the whole car get's pushed back, like it had been gently bumped by another car - that's the general feeling...

What should I do?!?

Thank you.

My best,
Sam
1 User said Thank You to smihaialex for this Post :
 tomfrog (18 July 2014)
JPV   
Tue Jul 01 2014, 03:27pm
Joined: Sep 04 2011
Member No: #606
Location: Norwich
Look at the posts on here about changing the gearbox fluid.
C6Dave   
Tue Jul 01 2014, 07:14pm

Joined: Oct 01 2009
Member No: #1
Location: Northumberland
as the 1st thing to do.
Website
gmerry   
Tue Jul 01 2014, 09:09pm
Joined: Dec 11 2009
Member No: #21
Location: Scotland
Hi Sam, I think you need an autobox specialist who can log the shift hydraulic pressures and adjust the shift points to eliminate the "flare" you are describing. The change of fluid wont hurt but it will not cure it either. Worst case is you may need a new hydraulic control block which Citroen sell as a spare unit
1 User said Thank You to gmerry for this Post :
 e3steve (02 July 2014)
mark28   
Wed Jul 02 2014, 09:23am
Joined: Apr 28 2010
Member No: #102
Location: Hampshire
Change the fluid
Kaloteck   
Wed Jul 02 2014, 11:27am
Joined: Apr 25 2013
Member No: #1271
Location: Warsaw
gmerry wrote ...

Worst case is you may need a new hydraulic control block which Citroen sell as a spare unit.

Yeah, this unit costs 1265 Euro in Germany, last time I checked and takes about 3 to 3.5 hours to replace (about 250-300 Euro labour costs). This box REALLY needs its oil changes, despite Citroen claims there's no need. The box manufacturer says once in 3 years or every 60 000 kms.
1 User said Thank You to Kaloteck for this Post :
 cruiserphil (02 July 2014)
e3steve   
Wed Jul 02 2014, 08:37pm
Joined: Jan 21 2013
Member No: #1163
Location: Warsash, Hants & Palma de Mallorca, Spain
mark28 wrote ...

Change the fluid


Mine's been better since I changed the fluid. It still has hiccups whereby it can't make up its mind which ratio to use, thus hunting between 2/3 or 3/4, but it is definitely better.

I've now carried out two 3-litre dumps/replenishments. I intend doing a couple more of the same before winter.
1 User said Thank You to e3steve for this Post :
 gregsNG56OOF (24 August 2014)
magicands   
Thu Jul 03 2014, 11:19am
Joined: Sep 13 2012
Member No: #1021
Location: Coventry, Warwickshire
There is a saying in life "If it aint broke, Don't fix it" but does this apply to gearbox oil.
My 07 plate with 54,000 on the clock runs fine but do I change the oil or leave well alone whilst things are running smoothly?
Website
Kaloteck   
Thu Jul 03 2014, 07:08pm
Joined: Apr 25 2013
Member No: #1271
Location: Warsaw
magicands wrote ...

There is a saying in life "If it aint broke, Don't fix it" but does this apply to gearbox oil.

No, it does not.
magicands   
Sat Jul 05 2014, 05:03pm
Joined: Sep 13 2012
Member No: #1021
Location: Coventry, Warwickshire
Kaloteck wrote ...

magicands wrote ...

There is a saying in life "If it aint broke, Don't fix it" but does this apply to gearbox oil.

No, it does not.


Thanks for your input, are you therefore suggesting I change the gearbox oil now?
Website
Kaloteck   
Sat Jul 05 2014, 11:25pm
Joined: Apr 25 2013
Member No: #1271
Location: Warsaw
Yes, by all means.
smihaialex   
Sun Jul 06 2014, 09:03am
Joined: Sep 18 2012
Member No: #1031
Location: Bucharest
Ok, I will do a gearbox oil change next week, and I know that it actually needs 3 or more before all the fluid gets replaced, but I really am afraid that this won't fix the problem

It's getting worse and worse - yesterday I raced to the Bucharest National Bank Tennis Arena and back and by the time I got back home the hunting and jerk between the 2nd and the 3rd was brutally violent... It revved up to 4000+ rpms when hunting for the 3rd and when it picked it up it felt like I just got rearended by a Garbage Truck

So, beaides changing the oil, what else should I/could I do?!?

Thank you very much.

My best,
Sam
hopalong525   
Sun Jul 06 2014, 10:55am
Joined: Jun 13 2013
Member No: #1327
Location: Omagh
Hi. I had the same problem. Changed the fluid and now working 100%. You wont get all the fluid out but enough to make a difference. Your symptoms can also be from low fluid level in transmission.
e3steve   
Sun Jul 06 2014, 12:43pm
Joined: Jan 21 2013
Member No: #1163
Location: Warsash, Hants & Palma de Mallorca, Spain
Change the damned fluid! Three times, around 300-500 miles (500-800kms) apart, three litres each time. Use Comma ASW, about GB£11/litre online (I have a trade account with a local Comma supplier but it's still a tenner per litre).

I used a 60cm length of Terrain/Bartol/Acorn 15mm dia. polypropylene-type water pipe and a smallish kitchen funnel that fitted into the end perfectly.

Follow the downloadable instructions to the letter. - Click Here -
1 User said Thank You to e3steve for this Post :
 smihaialex (01 August 2014)
artisan100   
Mon Jul 07 2014, 09:04pm
Joined: Mar 15 2014
Member No: #1625
Location: Herefordshire
Does anybody else find that the first drawing in the download is corrupted, or is it just me?

Geoff
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