P0701: Transmission Control System Range/Performance
Severity: high
What it means: P0701 means the transmission computer sees something in the transmission control system that isn't performing the way it expects. It's a general code that often sets along with a more specific one, such as an incorrect gear ratio or speed sensor code, so the other codes usually tell you more.
Safe to drive? Drive gently and only as far as needed to get it checked. The transmission may go into limp mode and lose power without warning.
Common symptoms
- Check engine or wrench light
- Limp mode or sudden loss of power
- Harsh or odd shifting
Likely causes, ranked
- A more specific transmission fault (see the other codes)Shop
- Low or wrong transmission fluidDIY or shop
- Internal pressure or sensor problemShop
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Vehicle-specific notes
- 2005–2007 Ford Five Hundred: Five Hundred CVT owners report P0701 with P0730 or P0715 during limp mode; a member on r/MechanicAdvice said P0701 often sets because P0730 is there. Read the full answer · Source
DIY or shop?
DIY for checking the fluid level and type and reading all codes. Most real repairs are shop jobs.
Before you replace parts
- Read all codes; fix the more specific ones first.
- Check the transmission fluid level and that it is the correct type.
- Check your VIN for recalls, service bulletins and extended coverage.
- Have a transmission shop diagnose before replacing the transmission.
Safety / mechanic note
Verify with a mechanic. A sudden loss of power in traffic is dangerous. A code points to a circuit or system, not always a specific part.
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