P0700
Transmission Control System (MIL Request)
- Severity
- Medium
- Driving
- Drivable — book it in
This is not a fault. It is the transmission control module asking the engine module to switch the check engine light on, because the transmission module has stored a fault of its own. The actual problem is recorded as a separate code inside the transmission module, and that is what has to be read. Chasing P0700 itself leads nowhere - it will clear the moment the real fault is fixed.
Possible causes
- CommonA fault stored in the transmission control module - this code only reports that one exists
What you might notice
- Check engine light on
- Any transmission symptom at all, or none
- Often accompanied by harsh shifts or a limp mode
What to check, in order
- Read the transmission control module, not just the engine module. Many basic scan tools only read the engine module, which is why this code so often appears on its own with nothing to explain it.
- The real code will be another P07xx to P09xx code stored in the transmission module. Diagnose that one.
- Check the transmission fluid level and condition while you are there. Low or burnt fluid causes a large share of the codes that trigger this request.
- Do not replace parts based on this code alone. It names no component.
Read this code from your own car
Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.
Where this code sits
P00xxP01xxP02xxP03xxP04xxP05xxP06xxP07xxP08xxP09xxP0AxxP0BxxP0CxxP0DxxP0ExxP0FxxP10xxP11xxP12xxP13xxP14xxP15xxP16xxP17xxP18xxP19xxP1AxxP1BxxP1CxxP1DxxP1ExxP1FxxP20xxP21xxP22xxP23xxP24xxP25xxP26xxP27xxP28xxP29xxP2AxxP2BxxP2CxxP2DxxP2ExxP2FxxP30xxP31xxP32xxP33xxP34xxP35xxP36xxP37xxP38xxP39xxP3AxxP3BxxP3CxxP3DxxP3ExxP3Fxx
Transmission
P0700P0701P0702P0703P0704P0705P0706P0707P0708P0709P0710P0711P0712P0713P0714P0715P0716P0717P0718P0719P0720P0721P0722P0723P0724P0725P0726P0727P0728P0729P0730P0731P0732P0733P0734P0735P0736P0737P0738P0739P0740P0741P0742P0743P0744P0745P0746P0747P0748P0749P0750P0751P0752P0753P0754P0755P0756P0757P0758P0759P0760P0761P0762P0763P0764P0765P0766P0767P0768P0769P0770P0771P0772P0773P0774P0775P0776P0777P0778P0779P0780P0781P0782P0783P0784P0785P0786P0787P0788P0789P0790P0791P0792P0793P0794P0795P0796P0797P0798P0799