P0700 — Transmission Control System Malfunction (MIL Request)
Moderate severityWhat it means
The transmission control module has detected a fault and asked the engine control unit to turn on the check engine light. P0700 itself is only a pointer: the actual problem is stored as a separate code inside the transmission module and must be read from there.
Common symptoms
- Check engine light
- Harsh, delayed or slipping shifts
- Transmission stuck in one gear (limp mode)
- Reduced power
Likely causes
- Depends on the stored transmission code — common ones include:
- Low, old or burnt transmission fluid
- Faulty shift solenoids
- Wiring or connector faults at the transmission
- Internal clutch or torque-converter wear
What to check first
- Read the transmission module codes with a scanner that supports it — that code is the real diagnosis
- Check transmission fluid level and condition where possible
- Check battery and charging voltage — low voltage can trigger transmission codes
- Inspect the transmission connector for leaks and corrosion
Can you keep driving?
If shifting feels normal, drive moderately and diagnose soon. If the transmission is slipping or stuck in gear, avoid driving — continued use can cause expensive damage.
Scan, log and diagnose with MechanicAI
Plug a Bluetooth OBD2 adapter into your car and let MechanicAI turn raw data into answers:
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- And above all — analyze it all with AI for the most likely cause and clear next steps.
Related codes
All information, explanations and guidance on this page are general preliminary information only. They are estimates and may be entirely wrong, incomplete or inaccurate, or may not apply to your vehicle at all. Never take any action based on this content alone — do not decide to keep driving, clear codes, replace parts, repair or otherwise work on your vehicle based only on what you read here. In every case, and for any final decision, you must consult qualified technical personnel (a professional mechanic, an authorized service centre or an engineer) and obtain their approval before acting. MechanicAI accepts no liability or responsibility whatsoever for any damage, fault, injury, loss or outcome that may arise — directly or indirectly — from using or relying on this information, for any reason and under any circumstances. By using this page you acknowledge and accept these terms.