Transmission Control System Malfunction
The Transmission Control Module (TCM) has reported a fault to the ECM. This is a general code; check for additional transmission codes.
Common causes
- Internal transmission fault
- Faulty TCM
- Low or dirty transmission fluid
- Wiring issues
Possible symptoms
- Check Engine Light on
- Harsh or erratic shifting
- Transmission in limp mode
Can I keep driving?
Avoid driving unless necessary: this is a serious fault that can leave you stranded or damage the engine or transmission. If the check-engine light is flashing, pull over safely and contact a workshop right away.
Code breakdown
Frequently asked questions
What does code P0700 mean?
P0700 stands for "Transmission Control System Malfunction". The Transmission Control Module (TCM) has reported a fault to the ECM. This is a general code; check for additional transmission codes.
Can I keep driving with code P0700?
Avoid driving unless necessary: this is a serious fault that can leave you stranded or damage the engine or transmission. If the check-engine light is flashing, pull over safely and contact a workshop right away.
How do I diagnose and fix code P0700?
Diagnosis starts with the most common causes, checked in this order: Internal transmission fault; Faulty TCM; Low or dirty transmission fluid; Wiring issues. Reading live data with an OBD-II tool helps confirm the fault before replacing any parts.
Related codes
- P0701 — Transmission Control System Range/Performance
- P0702 — Transmission Control System Electrical
- P0703 — Torque Converter/Brake Switch B Circuit
- P0704 — Clutch Switch Input Circuit Malfunction
- P0705 — Transmission Range Sensor Circuit Malfunction (PRNDL Input)
- P0706 — Transmission Range Sensor Circuit Range/Performance