Generic transmission system fault — the gearbox ECU has set a code; a transmission-aware scan tool is needed to read the subcode.
P0700 — also written PO7OO, P 0700, 0700 — is the OBD-II code for transmission control system malfunction. Same code, same fix: this page covers every spelling of it.
Transmission Control System Malfunction — this is a POINTER code, not a fault in itself. It means the gearbox ECU has stored a separate transmission fault and is asking the engine ECU to turn the MIL on. On its own P0700 tells you nothing — you need a scan tool that can read Transmission-specific codes (usually starting with 07, P07xx or manufacturer-specific) to know what actually failed. Never let a garage quote you a new gearbox from a P0700 alone.
P0700 is a transmission fault code, typically costing £80–£3500 to put right in a UK garage.
What P0700 actually feels like to drive
- Gearbox drops into 'limp' — stuck in 3rd or 4th gear with the MIL on
- Harsh 1st-to-2nd or 2nd-to-3rd shift, worst when cold
- Judder or shudder from a standstill (especially Ford PowerShift and Nissan CVT)
- Delayed engagement — 2–5 second pause between selecting D and the car moving
- P R N D indicator flashes on the dash
- Paired codes: P0715 (input speed sensor), P0720 (output speed sensor), P0730-P0733 (incorrect gear ratio), P0740 (torque converter clutch), P0847/P0848 (fluid pressure), manufacturer-specific 07xx codes
- On CVTs: 'burnt' or acrid smell from under the bonnet after a hot run
What causes P0700?
- Internal transmission fault (subcode required)
- Failed solenoid pack
- Low / contaminated ATF
- Wiring fault to transmission ECU
UK vehicles that throw P0700 most often
- Ford Focus / Fiesta / C-Max PowerShift DPS6 (2011–2016) — clutch pack + TCM software recall territory
- Vauxhall Astra / Insignia AF40 6-speed auto — solenoid pack ageing at 80,000+ miles
- VW Golf / Passat / Audi A3 DSG DQ200 (dry clutch) & DQ250 (wet clutch) — mechatronic faults
- BMW 1 / 3 / 5 Series ZF 6HP/8HP automatic — solenoid & valve body wear at 100,000+
- Mercedes A / B / C / E-Class 7G-Tronic 722.9 — conductor plate leak (very common)
- Nissan Qashqai / X-Trail / Juke CVT (JF010/JF011/JF015) — stepper motor / judder / burnt fluid
- Peugeot / Citroën EAT6 & AL4 automatic — solenoid wear, filthy ATF
- Land Rover Discovery Sport / Evoque 9-speed ZF (ZF9HP48) — solenoid recall on early cars
- Vauxhall Corsa Easytronic MTA — clutch actuator motor stalls (well-known)
How P0700 is fixed
- Scan with transmission-capable tool to read subcodes
- Check ATF level and condition
- Inspect transmission wiring connector
- Repair per subcode finding
The P0700 misdiagnosis that wastes money
P0700 is the single most abused fault code by chancer garages. Bob's seen at least a dozen cars where an owner has been quoted £2,500–£4,500 for 'a new gearbox' based on a P0700 alone — with no attempt to read the actual transmission-side fault code that P0700 is pointing at. Most 'failed' UK automatics we see are either overdue ATF (transmission fluid) causing dirty solenoids to stick, a single £180 solenoid pack failure, or a known TCM (Transmission Control Module) software bug that Ford, Mercedes, VAG and Land Rover have all issued free dealer campaigns for. On Ford PowerShift specifically, there is a Ford Extended Service Plan that extended clutch and TCM warranty to 7 years / 100,000 miles — even out-of-warranty cars regularly get free clutch packs and TCM updates under this plan; always ring Ford customer relations with your VIN before paying a penny.
What a UK garage should charge for P0700
UK independent gearbox specialist (NEVER a general garage — this work is specialist): diagnostic with manufacturer-level scan tool reading TCM codes £70–£120. ATF service (drain, filter, refill with correct spec) £180–£440 depending on gearbox and fluid cost. Solenoid pack replacement £280–£680 fitted. Mercedes 722.9 conductor plate £480–£820 fitted. VAG DSG mechatronic recon £900–£1,600. ZF 6HP/8HP valve body recon £700–£1,400. Full torque converter and clutch pack: £1,400–£2,600. Full replacement automatic: £1,800–£4,500. Nissan CVT replacement £2,400–£4,200. Do not let any garage quote you for a replacement gearbox without first: (1) reading the transmission-side fault code, (2) trying an ATF service if it hasn't been done in 40,000 miles, and (3) checking for open manufacturer software campaigns on your VIN.
P0700 repair cost in the UK
Most P0700 repairs land between £80–£3500 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 P0700
Three Bob rules for P0700. One: ignore anyone who quotes from P0700 alone — insist on the transmission-side sub-code in writing before any work is authorised. Two: the single most cost-effective thing you can do on any auto over 60,000 miles showing P0700 is a proper drain-fill-flush ATF service using the exact manufacturer-specified fluid (never a universal 'good for all' auto ATF — modern gearboxes are ferociously fussy about fluid spec). We've cleared P0700 with a £220 fluid service on ZF, AF40, 7G-Tronic and even some CVTs; the dirty fluid was causing solenoid stiction, and once the fresh ATF was in the codes cleared and never returned. Three: for Ford PowerShift, Mercedes 722.9, VAG DSG and Land Rover ZF9HP owners — ring the main dealer with your VIN BEFORE any repair to ask about open technical service bulletins or extended warranty campaigns. Ford in particular has replaced hundreds of thousands of PowerShift TCMs and clutch packs for free on cars up to 7 years old. Never accept 'you need a new gearbox' as a first opinion — always get a specialist second view.
Can you drive with P0700?
Often limp mode (stuck in 3rd or limp gear) — drive home only and book in.
Urgency: high.