P0700: a fault in the transmission control system
This is a general code. It means the transmission control unit has found a problem and stored more specific codes of its own. The code alone does not say what is wrong.
Can you keep driving?
Usually yes, but note how the transmission behaves.
What the code means
Think of P0700 as a signpost rather than a diagnosis. It tells you to look at the transmission system, where there is normally a separate and more detailed code sitting alongside it.
Common causes
- Any transmission fault, which has its own code
- A sensor or solenoid in the transmission
- Low or old transmission fluid
What to do now
- Note whether shifts feel different, jerk, or arrive late.
- Ask for a scan with a tool that supports the transmission, not just the engine.
- Ask which transmission code is behind the P0700.
What people often get wrong
Thinking P0700 itself is what gets diagnosed. It only leads you to the code that actually says something.
When the car must go to a workshop
A basic code reader often shows only P0700 and not the specific code behind it. That needs better equipment.
Read next
This page is general information and does not replace a professional assessment. Symbols, codes and behaviour vary between makes. Always check the handbook for your own car.
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