Gear position sensor reading invalid.
P0705 — also written PO7O5, P 0705, 0705 — is the OBD-II code for transmission range sensor. Same code, same fix: this page covers every spelling of it.
This is your gearbox's way of saying it's lost its place, usually because the selector switch is full of Scottish road salt or the linkage has stretched. It’s a classic on older Vauxhall automatics and the Aisin boxes found in Volvos and Saabs.
P0705 is a transmission fault code, typically costing £100–£500 to put right in a UK garage.
What P0705 actually feels like to drive
- The car refuses to crank at all, then starts fine 10 minutes later.
- Reverse lights don't come on, or flicker while you're backing up.
- Dash display for gear position (D, R, P) goes blank or shows a 'dash' symbol.
- Car goes into 'Limp Mode' (Home Mode) and sticks in 3rd gear to protect itself.
- Having to 'jiggle' the gear lever in Park just to get the engine to turn over.
What causes P0705?
- Failed range sensor
- Linkage out of adjustment
UK vehicles that throw P0705 most often
- Vauxhall Astra J (6T40 Auto) 2009-2015
- Vauxhall Insignia A (AF40 Gearbox) 2008-2017
- Volvo V70/XC70 (Aisin Warner) 2005-2012
- Ford Focus Mk2/Mk3 1.6/2.0 Petrol Auto 2008-2016
- Land Rover Freelander 2 (SD4 models) 2010-2014
- Nissan Qashqai J10 (CVT models) 2007-2013
How P0705 is fixed
- Sensor replacement
- Linkage adjustment
The P0705 misdiagnosis that wastes money
I’ve lost count of how many times I’ve seen folk waste money on a new battery or an alternator because their 'Start/Stop' system is acting up along with this code. They think it's an electrical drain when the car won't crank. In reality, the ECU just doesn't know the car is in Park or Neutral, so it inhibits the starter for safety. We also see plenty of 'Transmission Service' alerts on the dash that lead people to try a gearbox oil change, which is a £200 kick in the teeth when it turns out to be a £40 sensor or a corroded wiring pin.
What a UK garage should charge for P0705
A basic diagnostic scan is £50–£80 at an indie, or £150 at a main dealer. If it’s just a linkage adjustment, you’re looking at an hour’s labour—roughly £70–£100. For a new sensor (often called an Inhibitor Switch), parts from a factor like Euro Car Parts or GSF range from £60 to £180 depending on the brand (think Bosch or LuK). Total bill with labour and VAT usually lands between £180 and £350. If it's a Land Rover, expect that to creep closer to £500 for a genuine part.
P0705 repair cost in the UK
Most P0705 repairs land between £100–£500 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 P0705
Before you let a garage swap the sensor, ask them to check the selector linkage adjustment and the 'inhibitor switch' plug for green corrosion. If you've got an older Vauxhall or Ford, the wiring loom often rubs against the gearbox casing and shorts out. A proper tech should use a live data tool to see if the gear positions (PRNDL) change on the scanner when you move the lever. If the scanner shows 'Invalid' or 'Intermediate' while you're sitting in Park, the sensor is likely toast. Don't let them tell you the whole gearbox needs to come out; on most UK hatchbacks, this is an external job.
Can you drive with P0705?
Drivable.
Urgency: medium.