Symptom
Stuck between gears
The gearbox has left one gear and failed to engage the next, leaving the engine revving with no drive at all. Specific to automated manual and dual-clutch transmissions, where a robot works an ordinary H-pattern gearbox: a conventional automatic cannot do this, because its gears are applied hydraulically rather than by a mechanism travelling between positions. Alarming to experience mid-overtake and worth reporting precisely, since whether the car loses gears in groups or fails to engage any points at two different actuators. Do not keep trying — have it recovered if it will not take a gear.
Also described as: stuck in neutral, no drive between gears, won't engage a gear, revs but no drive, gearbox in neutral, lost drive mid change, neutral warning, transmission in neutral, بین دو دنده گیر کرده, گیربکس خلاص مانده, se queda entre marchas, no termina de meter marcha, atascado entre dos marchas, عالق بين غيارين, لا يكمل دخول الغيار, يعلق بين السرعات
Some causes mean you should stop driving
7 of the 96 codes that produce this symptom indicate a fault where continuing to drive risks damage or is unsafe. If the symptom is sudden or severe, treat it as one of those until a scan says otherwise.
What this usually means
This is specific to automated manual and dual-clutch transmissions, and the reason is mechanical. A robot works an ordinary H-pattern gearbox, so it can genuinely leave one gear and fail to engage the next, leaving the engine revving with no drive. A conventional automatic cannot do this, because its ratios are applied hydraulically rather than by a mechanism travelling between positions — which makes the complaint itself a strong clue about what kind of gearbox you are looking at.
Whether the car loses gears in groups or fails to engage any is the observation that matters, and it points at two different actuators. A dual-clutch gearbox is effectively two gearboxes — odd ratios on one clutch, even on the other — each with its own selector actuator. Losing every other gear points at one actuator or one clutch; losing all of them points at something common to both, such as hydraulic pressure in the mechatronic unit or its accumulator.
Do not keep trying. Repeated attempts to force an engagement with the synchroniser and the shaft speeds mismatched damages the mechanism, and a car that will not take a gear should be recovered rather than persuaded.
Position sensing is as common a cause as the actuator itself. The module knows where the selector forks are only from sensors, and a sensor that has drifted or a magnet that has moved leaves it commanding a position it believes it has already reached. That is a calibration or a sensor rather than a gearbox, which is worth establishing before anything is opened.
Working through it
| What you find | Likely cause | How to confirm it | What fixes it |
|---|---|---|---|
| Loses every other gear — odd or even only | One clutch or one selector actuator on a dual-clutch gearbox — the two halves fail independently | Establish which ratios are still available. Odd-or-even is the pattern that names the half. | Diagnose that half's clutch, actuator or its hydraulic circuit. The other half working is evidence, not luck. |
| Will not engage any gear, engine revs freely | Something common to both halves — hydraulic pressure in the mechatronic unit, its accumulator or pump | Read the unit's fault memory and its pressure data. Both halves failing together points upstream of either. | Repair or renew the mechatronic unit. Recover the vehicle rather than driving it. |
| Module reports a position the mechanism has not reached | Selector position sensing drifted, or a magnet displaced — the module commands a position it believes is already made | Compare commanded against actual fork positions live. A calibration mismatch shows immediately. | Recalibrate, or renew the sensor. This is not a gearbox repair and is worth excluding before one is proposed. |
| Happened during a fast change or a mid-overtake downshift | A marginal actuator or clutch exposed by the hardest demand rather than a new failure | Read the fault memory for the event and look at clutch wear and temperature data around it. | Repair on the data. A gearbox that fails only under the hardest demand is still failing. |
| Recovered after an ignition cycle and returned later | An intermittent — a latched fault released on restart, commonly hydraulic pressure or a sensor | Note that it clears on restart. Log live data on a drive that reproduces it; static testing will find nothing. | Repair what the log names. Do not clear codes before recording the freeze frame. |
| Gearbox oil service long overdue | Degraded fluid affecting the hydraulic actuation and the clutch behaviour that depends on it | Establish the service history. These gearboxes have a genuine service interval regardless of what a marketing phrase says. | Service to the exact specification and relearn the adaptation. Do this before condemning the mechatronic unit. |
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Loses every other gear — odd or even only
- Likely cause
- One clutch or one selector actuator on a dual-clutch gearbox — the two halves fail independently
- How to confirm it
- Establish which ratios are still available. Odd-or-even is the pattern that names the half.
- What fixes it
- Diagnose that half's clutch, actuator or its hydraulic circuit. The other half working is evidence, not luck.
-
Will not engage any gear, engine revs freely
- Likely cause
- Something common to both halves — hydraulic pressure in the mechatronic unit, its accumulator or pump
- How to confirm it
- Read the unit's fault memory and its pressure data. Both halves failing together points upstream of either.
- What fixes it
- Repair or renew the mechatronic unit. Recover the vehicle rather than driving it.
-
Module reports a position the mechanism has not reached
- Likely cause
- Selector position sensing drifted, or a magnet displaced — the module commands a position it believes is already made
- How to confirm it
- Compare commanded against actual fork positions live. A calibration mismatch shows immediately.
- What fixes it
- Recalibrate, or renew the sensor. This is not a gearbox repair and is worth excluding before one is proposed.
-
Happened during a fast change or a mid-overtake downshift
- Likely cause
- A marginal actuator or clutch exposed by the hardest demand rather than a new failure
- How to confirm it
- Read the fault memory for the event and look at clutch wear and temperature data around it.
- What fixes it
- Repair on the data. A gearbox that fails only under the hardest demand is still failing.
-
Recovered after an ignition cycle and returned later
- Likely cause
- An intermittent — a latched fault released on restart, commonly hydraulic pressure or a sensor
- How to confirm it
- Note that it clears on restart. Log live data on a drive that reproduces it; static testing will find nothing.
- What fixes it
- Repair what the log names. Do not clear codes before recording the freeze frame.
-
Gearbox oil service long overdue
- Likely cause
- Degraded fluid affecting the hydraulic actuation and the clutch behaviour that depends on it
- How to confirm it
- Establish the service history. These gearboxes have a genuine service interval regardless of what a marketing phrase says.
- What fixes it
- Service to the exact specification and relearn the adaptation. Do this before condemning the mechatronic unit.
Codes that produce this symptom (96)
Listed with the codes that most typically present this way first — the likeliest place to start.
- P07A7 Transmission Friction Element C Stuck On Typical of this code Stop driving High
- P0904 Gate Select Position Circuit A Typical of this code High
- P0905 Gate Select Position Circuit A Range/Performance Typical of this code High
- P0906 Gate Select Position Circuit A Low Typical of this code High
- P0907 Gate Select Position Circuit A High Typical of this code High
- P0909 Gate Select Control Error Typical of this code High
- P0910 Gate Select Actuator Circuit/Open Typical of this code High
- P0912 Gate Select Actuator Circuit Low Typical of this code High
- P0913 Gate Select Actuator Circuit High Typical of this code High
- P0914 Gear Shift Position Circuit A Typical of this code High
- P0915 Gear Shift Position Circuit A Range/Performance Typical of this code High
- P0916 Gear Shift Position Circuit A Low Typical of this code High
- P0917 Gear Shift Position Circuit A High Typical of this code High
- P0919 Gear Shift Position Control Error Typical of this code High
- P0920 Gear Shift Forward Actuator Circuit/Open Typical of this code High
- P0922 Gear Shift Forward Actuator Circuit Low Typical of this code High
- P0923 Gear Shift Forward Actuator Circuit High Typical of this code High
- P0924 Gear Shift Reverse Actuator Circuit/Open Typical of this code High
- P0926 Gear Shift Reverse Actuator Circuit Low Typical of this code High
- P0927 Gear Shift Reverse Actuator Circuit High Typical of this code High
- P0932 Hydraulic Pressure Sensor Circuit Typical of this code High
- P0934 Hydraulic Pressure Sensor Circuit Low Typical of this code High
- P0935 Hydraulic Pressure Sensor Circuit High Typical of this code High
- P0942 Hydraulic Pressure Unit Typical of this code High
- P0944 Hydraulic Pressure Unit Loss of Pressure Typical of this code Stop driving High
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Others with this symptom
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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