OBD-II code guide
P0700 Transmission Control System Malfunction
P0700 means the transmission control module has requested the engine computer to turn on the warning light.
What it means
There is a transmission-related fault stored in another module that needs a capable scanner.
Common symptoms
- Check engine light
- Transmission warning
- Harsh shifting
- Limp mode
- Car may not shift normally
Likely causes
- Transmission solenoid fault
- Speed sensor issue
- Low or dirty transmission fluid
- Wiring problem
- Internal transmission fault
First checks
- Use a scanner that can read transmission codes.
- Check fluid level only by the correct procedure.
- Do not ignore limp mode.
- Record all companion codes.