P0700: Transmission Control System Malfunction
The transmission computer has a fault and has asked the engine computer to turn on the check engine light. The real code is stored in the transmission module.
Green, yellow, red: three ways P0700 can look
The same code can be a quick fix or a reason to pull over. Match your situation to the closest example.
Keep an eye on it
Shifts normally, code set once.
Schedule a repair
Harsh shifting. Get the transmission codes read soon.
Stop and get help
Stuck in one gear or slipping badly. Don't drive far; you can destroy the transmission.
Symptoms you might notice
- Harsh or delayed shifts
- Stuck in one gear (limp mode)
Common causes, cheapest first
- Any transmission fault; read the transmission module
What you can check before calling
- Check transmission fluid if your vehicle has a dipstick
A code points to a system, not a part. Replacing parts based on the code alone is how people spend money without fixing the problem. Testing confirms the cause first.
Want the full story? Read our guide: Do you really need a transmission fluid change?.
Generic codes (second character 0) mean the same thing on every vehicle. Some manufacturers add their own details, so check service information for your exact vehicle.
More transmission codes
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does P0700 mean?
P0700 means "Transmission Control System Malfunction". The transmission computer has a fault and has asked the engine computer to turn on the check engine light. The real code is stored in the transmission module.
Can I drive with code P0700?
It depends on what the vehicle is doing. Green: Shifts normally, code set once. Yellow: Harsh shifting. Get the transmission codes read soon. Red: Stuck in one gear or slipping badly. Don't drive far; you can destroy the transmission.
What causes P0700?
The most common causes are: any transmission fault; read the transmission module.
Is P0700 a serious code?
It can be. Stuck in one gear or slipping badly. Don't drive far; you can destroy the transmission.
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