P0700
Transmission Control System (MIL Request)
Transmission
Generic OBD-II
High
What it means
P0700 is a general notification code: the transmission control module (TCM) has detected a fault and asked the engine computer to turn on the check-engine light. It doesn't pinpoint the problem on its own — it flags that one or more transmission-specific codes (P0701 and up) are stored. Many vehicles drop into limp mode until the underlying fault is read and repaired.
High
Can I keep driving? Often driveable for short trips, but expect limp mode, harsh shifts or being stuck in one gear; read the transmission sub-code and fix it soon to avoid further damage.
Common symptoms
What you'll notice
- Check-engine light on
- Harsh, rough or delayed gear changes
- Difficulty shifting or stuck in one gear (limp mode)
- Transmission slipping or hesitating
- Reduced fuel economy
Common causes
Most likely first
- Low or contaminated transmission fluidLikely
- Damaged or corroded wiring/connectors at the transmissionCommon
- Failing shift solenoid(s)Common
- Faulty transmission control module (TCM)Less often
- Internal mechanical transmission wear or failureLess often
How to diagnose & fix
Work through it in order
- Scan for the manufacturer-specific transmission sub-codes stored with P0700 — P0700 alone gives no detail, so those codes point to the real fault.
- Check transmission fluid level and condition; top up or service if low, burnt or contaminated.
- Inspect wiring and connectors at the transmission for damage or corrosion.
- Test and replace faulty shift solenoids as indicated by the sub-codes.
- If circuits check out, evaluate the TCM; leave internal transmission repair for last.
FAQ
Quick answers
Is it safe to drive with P0700?+
Short trips are usually possible, but the transmission may drop into limp mode (one gear) and shift harshly. Get the sub-codes read soon — driving on a real transmission fault can cause more damage.
Can I just clear P0700?+
It will come back until the underlying transmission fault is fixed. P0700 is only a flag that the TCM has stored other codes, so clearing it hides the actual problem.
Related codes
Often seen with P0700
Read & clear P0700 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX