P0700: Transmission Control System Malfunction
Severity: medium
What it means: The transmission computer has stored its own fault code and asked the engine computer to turn on the check-engine light. Read the transmission codes for details.
Safe to drive? Depends on the actual transmission code. Get it scanned with a tool that reads transmission codes.
Common symptoms
- Check-engine light
- Harsh, slipping or delayed shifts
- Possible limp mode (stuck in one gear)
Likely causes, ranked
- Underlying transmission code (solenoid, sensor, fluid)Shop
- Low or worn transmission fluidDIY
What it means: The transmission computer has stored its own fault code and asked the engine computer to turn on the check-engine light. Read the transmission codes for details.
Severity: Medium. Safe to drive? Depends on the actual transmission code. Get it scanned with a tool that reads transmission codes.
DIY or shop?
Check the fluid level and condition if your transmission allows it. Diagnosis is usually a shop job.
Before you replace parts
- Read all stored codes and freeze-frame data. Fix misfire, fuel or sensor codes before chasing emissions codes.
- Check the simple things first: connectors, vacuum hoses, fluid levels and the gas cap.
- Clear the code only after a repair, then confirm it stays off after a few drives.
- Check your VIN for recalls and service bulletins.
Safety / mechanic note
Verify with a mechanic if you notice drivability changes, warning lights or overheating. A code points to a circuit or system, not always a specific part.