Trouble code
P0700
Transmission Control System Malfunction
What P0700 means
This is a pointer code. The transmission control module has stored its own fault and is telling the engine computer to turn the light on. It carries no detail by itself.
Symptoms you may notice
- Check engine light
- Harsh or delayed shifts
- Limp mode holding one gear
Common causes, cheapest first
- A fault stored in the transmission module, which must be read separately
- Low or degraded transmission fluid
- Failed shift solenoid
- Wiring fault to the transmission
Before you buy anythingDo not buy anything for this code alone. You need a scan tool that reads transmission module codes, not just generic engine codes. The real fault is stored there.
What to do next
- Confirm the code with your own scan tool, or have it read free at a chain parts store.
- Decode your VIN so you know your exact engine and build date.
- Work down the causes above from cheapest to most expensive.
- Search NHTSA for a recall or service bulletin covering this symptom on your vehicle.
- Read the engine buying guide before ordering.
P0700 is a generic OBD-II code, standardized across every make and model sold in the US from 1996 onward. The meaning is the same on any vehicle; the specific part and its location are not.
Parts
Parts commonly needed for P0700
These go to Amazon. We earn a commission if you buy, at no extra cost to you — see our affiliate disclosure. Which one you actually need depends on diagnosis — read the note above first.
Confirm fitment against your VIN on the listing page before ordering. A part that matches your year and model can still be wrong for your build date or engine code.