Peugeot ECG Can't change gear - P0868 - oil deficit fault

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vmguru
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Peugeot ECG Can't change gear - P0868 - oil deficit fault

Post by vmguru »

Hi All,

I have a Peugoust 5008 203 1.6 HDi with a ECG gearbox

A couple of weeks ago I got the "Gearbox Faulty" message on the display followed by it being impossible to shift into any gear.
Selecting any gear briefly flashes the selected gear on the display (R, A1 etc) before dropping back to N

I haven't checked the actuator fluid not sure how I can do this I am hoping to drop the car off at the mechanics very soon. Could this be simply low gearbox oil level? I didn't see any obvious leaks.

I have Diagbox and getting fault code is P0868. A quick search here points to low hydraulic oil pressure.

I’ve attached a screenshot as I don't fully understand it.

Any suggestions or pointers for further analysis would be greatly appreciated

Thanks in advance
Attachments
PXL_20240613_102320359.jpg
PXL_20240613_102329301.jpg
PXL_20240613_103223915.jpg
Last edited by vmguru on 13 Jun 2024, 12:15, edited 2 times in total.
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GiveMeABreak
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Re: Peugeot ECG Can't change gear - P0868 - oil deficit fault

Post by GiveMeABreak »

Pop your VIN up so we can see the system you have. 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.

In the interim, it's likely these will be relevant:
Fault Code: P0945
Description of Fault: Electro-pump unit electric motor control fault : Short circuit to positive.

Description of the diagnostics:

Possibility 1
- Pressure sensor fault

Possibility 2
- Short circuit to positive; The pump is stopped

Possibility 3
- Incoherence between activation of the pump and variation in pressure.

Context of appearance of the fault code:
  • Hydraulic pump stopped
  • Technical precision on the context of appearance of the fault code: The pump is stopped
  • Absence of fault codes P0840 ; P0841 ; P0842 ; P1589 ; P1590
Conditions for Fault to clear:
  • No faults for 2 seconds
Downgrade Modes whilst Fault is active:
  • The gears above 3rd gear cannot be engaged
  • Request for neutral if the engine is running and the vehicle is stationary with a gear engaged without the brake pedal being pressed
  • Crawling deactivated
  • If the vehicle has the Stop and Start system: Stop and start function deactivated
  • 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:
  • Difficult/impossible to change a gear
  • Lack of power
  • Absence of automatic stopping of the internal combustion engine
Suspect Areas:
  • Pressure sensor
  • Electric motor
  • Controlled manual gearbox ECU

Fault Code: P0868
Description of Fault: Oil pressure deficit fault: Pressure too low. 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
Please Don't PM Me For Technical Help

Marc
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Re: Peugeot ECG Can't change gear - P0868 - oil deficit fault

Post by vmguru »

GiveMeABreak wrote: 13 Jun 2024, 12:03 Pop your VIN up so we can see the system you have. 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.
VIN: VF3**************[VIN obfuscated, can be read by forum staff]
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Re: Peugeot ECG Can't change gear - P0868 - oil deficit fault

Post by GiveMeABreak »

Okay, it's as I thought, so code descriptors are as above.

It really needs a dealer check here as these systems are specialist and need specialist knowledge to deal with to be honest. It may be that checking the actuator oil levels if too low may solve the other issue - so that's a first step. The oil level can be seen on the oil level bottle on the system - but you you cannot just top this up, as the system MUST be depressurised first before the oil quantity is checked and refilled, which requires professional level diagnostics and special oil.

So my advice would be get it to a dealer as they have all the equipment and this may save money in the long run taking it from garage to garage (for those who will even touch these).
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Marc
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Re: Peugeot ECG Can't change gear - P0868 - oil deficit fault

Post by vmguru »

Thanks I think this is beyond my basic car mechanic knowledge, I have heard so many bad things about these EGG gearboxes just going to get it fixed and get rid of this car.
Last edited by GiveMeABreak on 13 Jun 2024, 13:13, edited 1 time in total.
Reason: Removed Quote - No need for previous post
vmguru
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Re: Peugeot ECG Can't change gear - P0868 - oil deficit fault

Post by vmguru »

I ran Diagbox to check the Hydralic pressure of the gearbox I can see when the car is in N it seems to be bouncing between 38 bars to 60, it shoots up and slowly comes back down (screenshot attached)

When I change gears I can see this pressure bar dropping to 20 and then shoots back up to around 60 basically bouncing between 20 to 60 bars (screenshot attached)
Attachments
Changing gears bouncing between 20 to 60 bars
Changing gears bouncing between 20 to 60 bars
in Neutral gear (N) bouncing between 38 to 60 bars
in Neutral gear (N) bouncing between 38 to 60 bars
vmguru
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Re: Peugeot ECG Can't change gear - P0868 - oil deficit fault

Post by vmguru »

is there anything that I could look at? perhaps it needs a top up of oil? it would be useful to see diagram of the ECG gearbox and its components I can see there is a reservoir is this something I can check for fluid levels?
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Re: Peugeot ECG Can't change gear - P0868 - oil deficit fault

Post by xantia_v6 »

If the pressure is bouncing around, I would guess the the fluid has leaked out and the pump is mostly pumping air.

Look for oil stains.
vmguru
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Re: Peugeot ECG Can't change gear - P0868 - oil deficit fault

Post by vmguru »

xantia_v6 wrote: 13 Jun 2024, 13:10 If the pressure is bouncing around, I would guess the the fluid has leaked out and the pump is mostly pumping air.

Look for oil stains.
Thanks I had a quick look from the top of engine couldn't see anything all seems pretty dry I am planning to tow the car to the mechanics tomorrow his pretty familiar with these ECG gearboxes most mechanics don't understand them and do not want to touch them.
vmguru
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Re: Peugeot ECG Can't change gear - P0868 - oil deficit fault

Post by vmguru »

I have managed to locate the reservoir does look like I have a leak somewhere. The current level is just below the minimum, I wonder if I could top this up which would allow me drive this to garage instead of towing it
Attachments
PXL_20240613_162649144.jpg
RichardW
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Re: Peugeot ECG Can't change gear - P0868 - oil deficit fault

Post by RichardW »

The level is only correct when depressurised, however if you switch the ignition on and it goes down to almost empty then sticking a bit more in might work.
Richard W
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Re: Peugeot ECG Can't change gear - P0868 - oil deficit fault

Post by vmguru »

RichardW wrote: 13 Jun 2024, 18:20 The level is only correct when depressurised, however if you switch the ignition on and it goes down to almost empty then sticking a bit more in might work.
Any ideas what the specification of oil I need? I cannot see Eurocarparts or GFS selling it
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Re: Peugeot ECG Can't change gear - P0868 - oil deficit fault

Post by GiveMeABreak »

Please Don't PM Me For Technical Help

Marc
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Re: Peugeot ECG Can't change gear - P0868 - oil deficit fault

Post by vmguru »

Thanks that's seems very expensive for 1L of oil, will have a look around see if I can find it at more reasonable price, the specification from what I can see is "9979A4"

same stuff but cheaper https://www.ebay.co.uk/itm/324989317747
vmguru
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Re: Peugeot ECG Can't change gear - P0868 - oil deficit fault

Post by vmguru »

From what I can see Comma AQ3 meets the 9979 A4 specification and GSF sell this for £10.37, GSF is very local to me I will double check with them in the morning.

https://www.commaoil.com/passenger-vehi ... s/view/191

https://www.halfords.com/motoring/engin ... 24309.html
Attachments
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