P0700: Transmission control system malfunction
Drive carefully. Get it checked within a week or two.
Can I drive with P0700?
Yes, but drive carefully and get it checked soon. The transmission computer detected a fault and requested the check engine light; drive cautiously.
What does P0700 mean?
P0700 stands for Transmission Control System (MIL Request).
Symptoms you may notice
- Transmission locked in 3rd gear limp mode (won't shift up or down)
- Harsh clunking sound when shifting into Drive or Reverse
- Engine revs high without vehicle accelerating (slipping gear)
How much does it cost to fix?
Repair costs for code P0700 depend on the specific underlying root cause, ranging from simple DIY checks to component replacement. The table below lists the most common causes and rough price ranges in USD:
- Specific transmission code stored in TCM (solenoid, sensor, or slip)
- Low or degraded transmission fluid level
- Faulty transmission speed sensor
- Transmission harness connector fluid leak
What to do next
- Use an advanced OBD2 scanner that can read the Transmission Control Module (TCM) for sub-codes.
- Check transmission fluid level and color (if vehicle has a dipstick).
- Avoid towing heavy trailers or aggressive acceleration.
Last updated: October 2026
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General guidance only, not a professional diagnosis. If the check-engine light is flashing, or the car is running rough, overheating or losing power, stop driving and get help.
About this code
Code P0700 is an informational umbrella code. The engine computer sets it simply to announce that the dedicated Transmission Control Module (TCM) has detected a problem and stored its own specific code. The car may lock into 3rd gear (limp mode) to protect internal clutches. Drive gently to a repair shop.