P2712
Hydraulic Power Unit Leakage
- Severity
- High
- Driving
- Drive only to a garage
The hydraulic power unit is losing pressure faster than it should. On an automated manual or dual-clutch transmission, an electric pump keeps an accumulator charged and that pressure is what moves the clutch and selector actuators. A leak means the pump runs constantly to keep up, and eventually cannot.
Possible causes
- CommonExternal hydraulic leak at a pipe, seal or actuator
- CommonFailed accumulator, no longer holding pressure
- CommonInternal leak past a worn valve or seal
- CommonLow hydraulic fluid level
- PossibleWorn pump unable to maintain pressure
- PossibleFaulty pressure sensor causing unnecessary pump cycles
What you might notice
- Pump running frequently, including with the car standing still
- Slow or failed gear changes
- Transmission warning message
- Fluid leak visible under the car
- Car refusing to move
What to check, in order
- Look underneath for a leak. Frequent pump cycling with a falling fluid level is a leak until proven otherwise.
- Watch the pressure reading after the pump stops. Pressure falling away quickly with the car stationary confirms it is escaping rather than being used.
- Suspect the accumulator if there is no external leak and the fluid level is correct.
- Check the hydraulic fluid level and condition.
- Do not leave this. A pump running constantly wears out quickly and overheats the fluid, so a cheap repair becomes an expensive one.
Read this code from your own car
Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.
Where this code sits
P00xxP01xxP02xxP03xxP04xxP05xxP06xxP07xxP08xxP09xxP0AxxP0BxxP0CxxP0DxxP0ExxP0FxxP10xxP11xxP12xxP13xxP14xxP15xxP16xxP17xxP18xxP19xxP1AxxP1BxxP1CxxP1DxxP1ExxP1FxxP20xxP21xxP22xxP23xxP24xxP25xxP26xxP27xxP28xxP29xxP2AxxP2BxxP2CxxP2DxxP2ExxP2FxxP30xxP31xxP32xxP33xxP34xxP35xxP36xxP37xxP38xxP39xxP3AxxP3BxxP3CxxP3DxxP3ExxP3Fxx
Transmission
P2700P2701P2702P2703P2704P2705P2706P2707P2708P2709P2710P2711P2712P2713P2714P2715P2716P2717P2718P2719P2720P2721P2722P2723P2724P2725P2726P2727P2728P2729P2730P2731P2732P2733P2734P2735P2736P2737P2738P2739P2740P2741P2742P2743P2744P2745P2746P2747P2748P2749P2750P2751P2752P2753P2754P2755P2756P2757P2758P2759P2760P2761P2762P2763P2764P2765P2766P2767P2768P2769P2770P2771P2772P2773P2774P2775P2776P2777P2778P2779P2780P2781P2782P2783P2784P2785P2786P2787P2788P2789P2790P2791P2792P2793P2794P2795