The gearbox ECU has flagged shift solenoid A as not behaving mechanically as commanded — usually stuck, blocked with debris, or hydraulically leaking rather than a pure electrical fault.
P0750 — also written PO75O, P 0750, 0750 — is the OBD-II code for shift solenoid 'a' malfunction. Same code, same fix: this page covers every spelling of it.
P0750 means the gearbox brain can't talk to 'Solenoid A', usually leaving you stuck in one gear. It's a classic headache on aging Ford Transits and Vauxhall automatics that haven't had their oil changed.
P0750 is a transmission fault code, typically costing £200–£1000 to put right in a UK garage.
What P0750 actually feels like to drive
- Gearbox gets 'stuck' in 3rd gear (Limp Mode) to get you home.
- Hard, neck-snapping thuds when shifting from Park into Drive.
- The car feels like it's dragging an anchor because it's trying to pull away in 2nd or 3rd.
- Engine revs high but the car doesn't speed up properly (slipping).
- The 'Check Gearbox' or 'Service Transmission' message on the dash.
What causes P0750?
- Solenoid mechanically stuck (contaminated ATF the main cause)
- Blocked valve body passage
- Worn solenoid seals
- Low ATF level or degraded fluid
UK vehicles that throw P0750 most often
- Ford Transit 2.2 TDCi (with 6-speed auto) 2011-2016
- Vauxhall Astra J / Insignia (AF40-6 Gearbox) 2009-2015
- Volkswagen Golf MK6 1.6/2.0 TDI (DSG 6-speed DQ250) 2008-2013
- Land Rover Discovery 3/4 (ZF 6HP/8HP units) 2005-2015
- Ford Focus 2.0 TDCi (Powershift units) 2010-2015
- BMW 3 Series E90/F30 (ZF Automatics) 2006-2016
How P0750 is fixed
- ATF and filter service first — often clears it
- Solenoid pack replacement if stuck
- Valve body clean or refurb on higher-mileage autos
The P0750 misdiagnosis that wastes money
I've seen so many lads just chuck a new solenoid at this because the scanner said 'Solenoid A', only for the fault to come right back 20 miles later. On the Vauxhalls and Fords, it's often not the solenoid itself but a broken wire in the loom or a corroded multi-plug where road salt from our lovely Scottish winters has got in and greened-up the pins. People also panic and pay for a full recon gearbox rebuild when all it really needed was a fresh set of solenoids and a proper ATF flush. Check the loom for continuity before you open the wallet for a valve body.
What a UK garage should charge for P0750
Usually, you're looking at a £60-£90 diagnostic fee to start. If it's just a single solenoid on something like a Ford or VW, parts are around £80-£150, but labour is the killer because the pan has to come off, which means 2-4 hours (£140-£280). With a fresh batch of high-quality ATF (Automatic Transmission Fluid) at £15-£20 a litre, a basic fix is £350-£500. If the whole valve body is shot, a main dealer will quote you £1,500+, but a good independent specialist can usually sort it for £800 using OE parts from Bosch or BorgWarner.
P0750 repair cost in the UK
Most P0750 repairs land between £200–£1000 including parts and labour. The spread is wide because the cheap fix (a sensor, a hose, a leak) and the expensive fix (a major component) throw the same code — which is why a proper diagnosis before parts are bought saves the most money.
Bob's tip on P0750
If you take it to a garage, ask them specifically if they've done a 'resistance test' on the solenoid circuit from the TCM (Transmission Control Module) plug. Don't let them just read the code and swap parts. If the resistance is 'open circuit', it could be a £10 wire repair instead of a £600 solenoid job. Also, insist on a full transmission fluid service (using OE spec fluid like Febi or ZF, not the cheap 'one size fits all' supermarket stuff) because old, burnt fluid is what kills these solenoids in the first place by gumming up the pintle.
Can you drive with P0750?
Erratic or delayed shifting — get it looked at before it lets go on a hill.
Urgency: high.