Automatic gearbox specialists
Will your automatic not change gear?
Stuck in one ratio, no kickdown, or it will not go up the box. An automatic that will not shift is not waiting for a long run to learn.
- Held in one gear, revs hitting the limiter?
- No downshift when you put your foot in?
- A lamp on, and the gearbox has gone quiet?
When an automatic stops changing gear, the control unit has usually given up on a clean shift. Sensors, solenoids, pressure or limp mode. That diagnosis is core work at Service4Service.
Do not keep flattening it against the limiter in one gear. You will overheat what is left of Drive.
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Why will an automatic not change gear?
An automatic that will not change gear is usually in limp mode, or the control unit cannot apply the next ratio. Causes include a failed speed sensor, a faulty shift solenoid, low pressure, a slipping clutch pack, or a wiring or control unit fault. The car may still move in a single gear, but it should be diagnosed rather than driven on.
A conventional automatic gearbox needs the transmission control unit to fire solenoid valves so the next clutch pack applies. If a speed sensor dies, or pressure collapses, it holds a gear.
That hold is often limp mode. You may still crawl. You should not treat it as a finished journey.
Volkswagen DSG and Ford Powershift can refuse odd or even ratios when one clutch is out. A diagnostic check is how we tell a clutch from a mechatronic.
- Often limp mode holding one fixed gear
- Speed sensor, solenoid and pressure faults are common triggers
- A dual-clutch can lose odd or even gears when one clutch fails
- Fault codes and live data identify the cause
No shift is the gearbox protecting itself
One gear, no kickdown, or a dead PRND display is not a software tantrum you can clear with a restart. Keep using it as normal and you cook that ratio.
Not-changing-gear symptoms people search
If any of these sound like your car, do not wait for it to fail on the road.
Stuck in third or fourth
Classic limp. Scan it.
Will not kick down
Control, a map or a failed solenoid.
Will not go into a higher gear
The next pack is not applying.
No odd or no even on a dual-clutch
One clutch or one half of the mechatronic.
After a jolt or a pothole
A knocked sensor plug.
Clears then comes back hot
Hardware. Not a coincidence.
How a shift is supposed to happen
Speed sensors, load and the transmission control unit agree a change. Oil then clamps the next pack. A printout of fault codes such as P0700 or a ratio code is a clue, not a gearbox quote.
If it is stuck in one gear and that is the only ratio left, stop motorwaying it.
The computer commands a change
A solenoid should open.
Nothing happens
Limp, a dead valve, or a dead pack.
You stay in one gear
Heat. It only gets worse.
No-shift work we do
We diagnose why the automatic will not change, from a speed sensor to a failed pack, then repair the control or the hydraulics if that is honest.
- Live data versus limp diagnosis
- Solenoid, sensor and TCU checks
- Dual-clutch odd/even faults
- Collection when it is stuck in one gear
Stuck without a shift?
That is not a later job. That is automatic gearbox repair. Call before the gear you have left overheats.
Why this work comes to Service4Service
- Automatic and dual-clutch work is core work, not a sideline
- Diagnosis before parts
- Collection when the car should not be driven
- 12 months or 12,000 miles on parts and labour
Guarantee and payment
Repairs are backed by a 12 month or 12,000 mile warranty on parts and labour. See Payment Options for ways to pay.
Usually limp mode. The cause can be a sensor, a solenoid or internal damage. Diagnose it.
It can clear limp for a minute. The fault is still there.
Yes. Check for a leak.
If the engine revs and the ratio never changes, start with the gearbox.
No.
Crawl to safety and call. A long run in limp cooks the unit.
The control unit may be holding a gear because of a detected fault, for example a speed sensor, solenoid or pressure problem, or because a clutch pack cannot apply. Low fluid, a wiring fault and a failed control unit can also stop upshifts.
A downshift can be blocked by a sensor or solenoid fault, by limp mode or by low pressure. Kickdown that fails or comes late can also come from the throttle position signal, so a scan for codes and live data comes first.
Switching off can sometimes cancel limp mode for the journey, but the fault that caused it usually returns and the code remains stored. Repeating the trick can let wear continue unnoticed, so get the car scanned.
Related guides
Do not hold an automatic on the limiter
If it will not change up or down, tell us the codes and the symptoms. No-shift diagnosis is work we do every day.
