Automatic gearbox specialists
Having a gearbox oil pump issue?
Delayed Drive that is worse from cold, or no Drive at all. A weak pump does not recover with miles.
- A long pause into Drive, then a bang?
- No Drive when hot, engine still fine?
- Whine from the bellhousing that rises with revs?
The gearbox oil pump is how an automatic makes pressure. No pump, no Drive. A worn pump looks like a failed gearbox. Pump diagnosis is core work at Service4Service.
A car that takes longer and longer to find Drive is running out of pressure. Call while it still moves.
8am - 5.30pm Mon-Fri
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What is a gearbox oil pump?
The oil pump sits at the front of a conventional automatic gearbox, driven by the torque converter. It feeds the valve body so clutch packs can clamp.
A gearbox filter protects it. Debris from burnt packs can take the pump with them.
Low pressure from a pump is not a solenoid on its own. A diagnostic check with pressure tests splits them.
A weak pump will leave you with no Drive
Cold delay that becomes hot delay, then nothing, is a classic pressure death. Keep launching it and you glaze the packs the pump can no longer apply.
Pump symptoms people search
If any of these sound like your car, do not wait for it to fail on the road.
Delayed Drive from cold
Pump wear or thick, tired oil.
No Drive when hot
Clearances grow. Pressure collapses.
Whine with engine speed
Pump or converter area.
All gears feel soft
Line pressure, not one pack.
After a failed clutch job
Debris through the pump.
Warning then limp
The TCU has seen the pressure drop.
How a gearbox oil pump works
The converter hub turns the pump. automatic transmission fluid is drawn through the filter and sent to the body. A blocked transmission cooler can raise pressure and heat until something gives.
Scoring on the pump faces is often the first hard evidence after a burnt-pack failure.
The converter drives the pump
Oil pressure rises.
Wear or debris cuts that pressure
Drive is late.
Pressure collapses
No Drive. It only gets worse.
Pump work we do
We test pressure, inspect oil and, where the unit allows, repair or replace a failed pump as part of an automatic repair, not as a guess.
- Pressure testing
- Pump and converter hub inspection
- Filter and debris checks
- Collection when Drive is fading
Drive taking longer every week?
That pause is pressure leaving the building. That is automatic gearbox repair. Call before you have no Drive.
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.
Sometimes. If debris has gone through the unit, a pump alone is not honest. We will say which.
No. Valve body, fluid level and packs can mimic it. Test first.
They have hydraulic pumps. Layout differs. Diagnosis still starts with pressure and codes.
If the oil is thick and neglected, it can help a mild case. A scored pump will not heal.
No.
No. The bang that follows is harder on the packs.
Related guides
Do not wait for delayed Drive to become no Drive
If the auto takes a run-up to find Drive, tell us the symptoms. Pump diagnosis is work we do every day.
