Citroen Grand C4 Picasso 2012 MCP6 error

[kalm007]

Hi everybody!

I have a problem with my car. I received an error code. P0944. I have deleted the error code for two weeks and I tested the mcp6 with diagbox. All test was good so I do not know what the problem is I looked at the oil pressure value and it was 40-45 bar. Sometimes it was 50 bar in operating process I used my car and I drived 200-300 km without problem. Now I received the error code again. I looked at the oil level and it is good as well.

[GiveMeABreak]

It's saying there isn't enough pressure in the accumulator that provides the high pressure required to operate the system.

Fault Code:	P0944
Description of Fault:	Fault: oil pressure storage cell discharged: Not characterised. Discharging of the hydraulic accumulator. The following conditions have to be met: - Clutch closed - Absence of gear changing Technical precision on the context of appearance of the fault code: Operation of the hydraulic pump. Supply voltage correct between 8V and 16V (Pin 3 of the 28-way connector)
Conditions for Fault to clear:	Ignition switched off and on again
Downgrade Modes whilst Fault is active:	Change to Neutral and anticipated closing of the clutch ( engine running - Gear engaged - Clutch open)
Symptoms:	Lack of power Leaks
Suspect Areas:	Electric motor Electro-pump Level of oil in the gearbox hydraulic reservoir Accumulator Pressure sensor Leak/kinking in the hydraulic piping Controlled manual gearbox ECU

[kalm007]

Thank you for your help.
I didn't understand why i didn't get a notificaton that i got a help. :S

So the main problem is the electric pump. Firstly I have to replace it.

https://eurofrance24.com/catalogsearch/result/?q=259150

[GiveMeABreak]

You need to check your user preferences under your profile to ensure you are notified accordingly.

[kalm007]

myglaren admin helped me in private message and it is working.

So currently I use my car and when I drive it sometimes I get an error message on the display. " gearbox faulty" but I can drive it. But sometimes the the transmission ( "when I am driving" ) change to neutral . So I have to set from A to N and from N to A and I continue drive.

Do you think the oil pump could be bad what I linked former.

[GiveMeABreak]

It's not going to get any better, that's for sure, so I would get it seen to by a competent garage that has a lot of experience with these piloted manual boxes - or get it to a good dealer as it may save you money in the long run if they can diagnose the problem straight away. AS you can see the fault descriptor has multiple possibilities, so you really need it confirming first before replacing parts.

[kalm007]

Yes. But it is very expensive
Today I made some test with diagbox. Firstly I got a new error code. P0868. Too low pressure. I searched this error code on the internet and I found a russian video. He had this problem. He disassembled the control unit and he replace the actuator accumulator and the problem was solved. I think I try this method.

Sorry it is contain hungarian language. Hidraulika nyomás= Hidraulic pressure.

Continuously it is losing the pressure and the actuator motor working when the pressure is too low. The actuator motor make a normal pressure and right after the pressure fall slowly when the pressure is good.

You can see this process on the picture.

[schaffi]

Szia!
Megoldódott a probléma? Ha igen, megkérdezhetem hogy mi volt a gond? Én is p0868 hibakóddal szívok most egy robotváltós pg. 3008-cal.


Translated text:-
"Hi!
Has the problem been solved? If so, may I ask what the problem was? I'm also sucking with error code p0868 on a robot gearbox pg. 3008."

https://www.deepl.com/

[GiveMeABreak]

@schaffi: This is an English language Forum, so please use a translator if you don't speak or write English, for the benefit of others.

Post your VIN up and I will take a look at your specific fault code. Please post your VIN in full without spaces - it will be automatically masked from public view after submitting your post & will only be visible to staff.

[kalm007]

I solved the problem. Currently the MCP6 gearbox is working. The problem was with hidraulic pressure holder. I had to change this part and the oil because it was very dirty and I washed the oil reservoir. Tutela cs speed is the proper oil for the activator.

[schaffi]

@schaffi: This is an English language Forum, so please use a translator if you don't speak or write English, for the benefit of others.

Post your VIN up and I will take a look at your specific fault code. Please post your VIN in full without spaces - it will be automatically masked from public view after submitting your post & will only be visible to staff.

I apologize! The poster is also Hungarian, so I thought the solution would be faster.

My VIN is VF3**************[VIN obfuscated, can be read by forum staff]

My fault:
At the moment after starting, a beep sound and a yellow triangle appear on the display for one second, then disappear immediately. This phenomenon rarely occurs. 1x per month approx. Everything works perfectly, including the gearbox and clutch. But after the signal I always find a P0868 error code with the diagnostics.

Thank You!

[schaffi]

I solved the problem. Currently the MCP6 gearbox is working. The problem was with hidraulic pressure holder. I had to change this part and the oil because it was very dirty and I washed the oil reservoir. Tutela cs speed is the proper oil for the activator.

Thanks for the help! So that black ball was replaced and the problem solved?

[kalm007]

Yes

[GiveMeABreak]

Fault Descriptor:

Fault Code:	P0868
Description of Fault:	Oil pressure deficit fault: Pressure too low. Description of the diagnostics: Hydraulic pressure too low. Context of appearance of the fault code: The following conditions have to be met: - Ignition on - The starter motor is not operating - Absence of gear changing Technical precision on the context of appearance of the fault code: The pump is operated No fault coming from the oil pressure sensor
Conditions for Fault to clear:	Hydraulic pressure above the minimum pressure (For 0,5 s)
Downgrade Modes whilst Fault is active:	Changing gear impossible if the pressure is lower than 35 bars Emergency request for neutral if the pressure is lower than 31,9 bars Switching on of the warning lamp and/or warning message (*) "SERVICE" warning lamp - Sport warning lamp - Snow warning lamp - Automatic or 6-speed piloted manual gearbox warning lamps (Orange PRND triangle) - Display of a "-" on the fascia panel
Symptoms:	Changing gear impossible if the pressure is lower than 35 bars Emergency request for neutral if the pressure is lower than 31,9 bars Difficult/impossible to change a gear Lack of power Oil leak
Suspect Areas:	Electro-pump 30 A fuse relating to pin 5 of the ECU connector Pressure sensor Electro-pump Controlled manual gearbox ECU Hydraulic leak on the electrovalve Electric motor Reservoir Accumulator Leak/kinking in the hydraulic piping Piloted manual gearbox electrovalve block Gearbox actuator surpression valve Selection solenoid valve Piloted manual gearbox electropump Pump seal Piloted manual gearbox electric motor Electrical harnesses Fuses

[schaffi]

Thank You!