The change from first to second is not completing as commanded. Common on higher-mileage torque converter automatics.
P0781 — also written PO781, P 0781, 0781 — is the OBD-II code for 1-2 shift malfunction. Same code, same fix: this page covers every spelling of it.
P0781 is a transmission fault code, typically costing £200–£2500 to put right in a UK garage.
What causes P0781?
- Low or degraded fluid
- Failed shift solenoid
- Worn 1-2 clutch pack or band
- Valve body wear
How P0781 is fixed
- Fluid and filter service
- Replace the shift solenoid
- Gearbox specialist inspection if clutch material is present in the sump
P0781 repair cost in the UK
Most P0781 repairs land between £200–£2500 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.
Can you drive with P0781?
Drive gently and get it looked at. Slipping shifts damage clutches fast.
Urgency: high.