P0700: Transmission Control System Malfunction
Updated November 12, 2026
P0700 isn't the problem itself. It means the transmission control module has stored its own fault code and asked the engine computer to turn on the check engine light. You need a scanner that reads transmission codes to see the real cause.
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🔧 Want to check this yourself? An OBD2 scanner reads the code; models with live data also show the sensor readings used in the checks below. See code readers and scanners from $24.99 ↓ · Which scanner do I need?
Common causes
- Any transmission fault stored in the transmission module, such as a shift solenoid or speed sensor problem
- Low or worn transmission fluid
- Wiring problems between the modules
Code meanings can vary slightly by manufacturer. Use these as a starting point and confirm with your vehicle's service information or a mechanic before replacing parts.
Symptoms
- Check engine light
- Harsh or delayed shifts
- Transmission stuck in one gear (limp mode)
Is it safe to drive?
Drive gently and get it checked soon; driving in limp mode for long can cause more damage.
How to check it with a scanner
- Plug an OBD2 scanner into the port under the dashboard and read all stored codes and the freeze-frame data (the conditions when the code set).
- Use a scanner that can read the transmission module to get the specific code.
- Check transmission fluid level and condition if your vehicle has a dipstick, following the owner's manual (many need the engine warm and running in Park).
- Fix the transmission code first; P0700 clears with it.
- After a repair, clear the code and drive normally for a few days to confirm it doesn't come back.
A basic code reader shows the code; scanners with live data let you watch sensor readings, which is what you need for most of the checks above. See OBD2 scanners under $100.
Code readers and scanners in stock
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Questions
What does P0700 mean?
P0700 is the generic OBD2 code for "Transmission Control System Malfunction." P0700 isn't the problem itself. It means the transmission control module has stored its own fault code and asked the engine computer to turn on the check engine light. You need a scanner that reads transmission codes to see the real cause.
Is it safe to drive with P0700?
Drive gently and get it checked soon; driving in limp mode for long can cause more damage.
How do I check P0700 myself?
Read the code and freeze-frame data with an OBD2 scanner, then: Use a scanner that can read the transmission module to get the specific code. Check transmission fluid level and condition if your vehicle has a dipstick, following the owner's manual (many need the engine warm and running in Park). Fix the transmission code first; P0700 clears with it.
Related codes
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