P0700 Transmission Control System Malfunction
What does P0700 mean?
P0700 — Transmission Control System Malfunction. This is an OBD-II diagnostic trouble code a scanner retrieves when your vehicle's computer detects transmission control system malfunction. The level of risk depends on how the vehicle is currently running and how long you've been driving with the light on.
Common causes of P0700
- Transmission control module (TCM) fault
- Faulty transmission solenoids or sensors
- Damaged transmission wiring harness
- Low or contaminated transmission fluid
- Internal transmission mechanical failure
How to fix P0700
- Read the transmission-specific codes with an OBD-II scanner capable of module diagnostics
- Check transmission fluid level and condition
- Inspect the transmission harness and connectors
- Diagnose the underlying TCM codes rather than treating P0700 alone
- Repair the cause of the specific transmission code