TransmissionGeneric OBD-II codeUrgency: Garage soon
Code P0868: low gearbox oil pressure
What code P0868 means
The gearbox or engine ECU has detected that the hydraulic fluid pressure in the automatic transmission is below the range set by the manufacturer. That fluid lubricates, cools and operates the internal clutches.[1][2]
It is a generic OBD-II code. The exact wording may vary slightly depending on the manufacturer or ECU version.[2]
Original definition (SAE J2012): Transmission Fluid Pressure Low[1][2]
Causes of P0868
From most to least likely, according to the sources.
- 1Low gearbox oil level due to leaks, or degraded or unsuitable oil.[1][2]
- 2Worn transmission oil pump that does not hold pressure.[1][2]
- 3Dirty or worn valve body or solenoids, which alter line pressure.[2]
- 4Faulty fluid temperature (TFT) sensor or its wiring, according to one of the sources.[1]
- 5Internal gearbox wear, rarer, with debris and slipping already present.[2]
Symptoms
- Engine warning light on.[1]Engine warning light: faults that cause it
- Gearbox slipping and gear changes that are slow to engage.[1][2]
- Jerking when changing gear.[2]Jerking: faults that cause it
- The car may go into limp mode.[1]Limp mode: faults that cause it
- Gearbox overheating and abnormal noises.[1][2]
How to diagnose P0868
In order: from the most likely and cheapest to check to the most expensive.
- 1Check the gearbox oil level and condition and look for leaks. If the oil is burnt, it must be replaced; with the correct level and type, top up or change it as the manufacturer indicates.[1][2]
- 2Inspect the gearbox wiring and connectors for burns or corrosion, and check the supply and ground of the fluid temperature sensor.[1][2]
- 3With a diagnostic tool and, if possible, a pressure gauge, compare the pressure the ECU reads with the actual pressure.[2]
- 4If the electrical side is fine, check the valve body, the solenoids and the pump before considering the whole gearbox.[2]
Can I keep driving with P0868?
Garage soon
Low pressure can damage the internal clutches and overheat the gearbox, so take it to a garage as soon as possible and cover only short distances, gently.[1][2]
Documented faults related to P0868
Known faults of specific engines and cars, with their repair cost, the affected years and their sources.
Automatic gearbox (torque converter and CVT): the most serious faults by engine and car
- Critical severityFrequency: CommonMultitronicWear of the variator chain and conesYes: the variator uses a chain of more than 1,000 links between two pairs of cones that wears with mileage, especially if the oil is not changed regularly. Gebrauchtwagenberater ties the gearbox's reputation to "numerous total failures"; Schaeffler/LuK sells a kit to repair the chain.
- Critical severityFrequency: Common2.0 CDI (OM640)Costly failure of the Autotronic (CVT) automatic gearboxYes: the Autotronic continuously variable gearbox, optional on the 180 CDI and 200 CDI, is the problem cited most by owners of the 140 hp version (24 of 114 testimonies) and a fault hotspot according to the ADAC up to 2006. A German source recommends avoiding it and choosing the manual gearbox.
- High severityFrequency: CommonMultitronicControl unit (TCU) failure and limp modeYes: the multitronic control unit, especially in the 01J code (up to 2007), is one of its best-documented weak points. Overheating with oil seeping into the control unit causes fault warnings and limp mode and, if ignored, can end up damaging the gearbox itself.
- High severityFrequency: Common7G-Tronic / 9G-TronicConductor plate and speed sensor failure (limp mode)Yes: one of the most cited weak points of the 7G-Tronic (722.9) is the internal conductor plate, which integrates the turbine, output and intermediate-shaft speed sensors; if it fails it can trigger a limp mode with delayed shifts or harsh jerks, although it does not always require replacing the whole gearbox.
- High severityFrequency: CommonAudi A6 C6Wear and failures of the Multitronic automatic gearbox on front-wheel-drive versionsYes: on front-wheel-drive versions with the Multitronic (CVT) gearbox, gebrauchtwagenberater.de documents jerking when pulling away that can progress to complete failure, especially on older cars; fiches-auto.fr adds selector lock-ups and torque converter breakages. The quattro versions, with the Tiptronic gearbox, do not share this problem.Repair (garage): €1,000Appears at around 120,000 km
- High severityFrequency: CommonMINI Cooper R50Faults in the CVT automatic gearbox, the manual gearbox and the clutchAccording to the reports collected by fiches-auto.fr, the Mini R50 accumulates 22 gearbox mentions and 32 clutch mentions, and the CVT automatic variant is described as fragile and 'to be avoided'. Wikipedia confirms that the CVT and the manual gearboxes were fitted depending on the year.
Frequently asked questions
What does code P0868 mean?
That the automatic transmission oil pressure is lower than expected. It may be down to a lack of oil, the pump, the valve body or a sensor.[1][2]
Is P0868 serious?
It can be: with low pressure the gearbox slips, heats up and the internal clutches get damaged. If the oil is low or degraded, correcting it in time usually avoids a much bigger repair.[1][2]
What should I check first?
The gearbox oil level and appearance, and whether there are leaks. It is the simplest check and the one that solves the most cases.[1][2]
Will I pass the MOT with code P0868?
If the code has switched on the engine warning light, no: with that light on, the inspection records a serious defect, and on Euro 5 and Euro 6 cars the ITV (Spain's roadworthiness inspection, similar to the MOT) also reads the OBD diagnostic system. Repair the fault before you go; clearing the code just before the inspection does not help either, because it counts as a serious defect.[3]
Not sure what is wrong with your car? Describe what you notice in the symptom diagnosis or see all fault codes.
Sources
Every fact on this page links to its source. If you find an error, let us know.
- Código P0868: baja presión del fluido de la transmisiónCódigosDTC · Technical documentation · consulted 29 October 2026 · in Spanish
- Code défaut P0868: pression de fluide de transmission trop basseCarverif · Technical documentation · consulted 29 October 2026 · in French
- Desmontando mitos: ¿puede pasar mi coche la ITV con el testigo de «avería motor» encendido?Diariomotor · Motoring press · published 8 March 2021 · consulted 2 October 2026 · in Spanish