P0700 code meaning
Transmission Control System (MIL Request)
Powertrain system Generic code P07xx codes Check engine light
What P0700 means
P0700 is a notice code: the separate transmission control module has stored an emission-related fault of its own and asks the engine module to switch on the check engine light. The actual fault – a sensor, solenoid, ratio or speed sensor code – is stored in the transmission module and must be read with a tool that can address it; simple OBD readers often show only P0700. GM's engine module reads the request message from 3 s after start; Subaru-based systems (Saab 9-2X) light the MIL at once and clear it after three fault-free cycles. Ford's engine modules with integrated transmission control do not use P0700. Any limp mode comes from the transmission fault, not from P0700.
P0700 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0700
- Check engine light, possibly transmission warning
- Depending on the transmission fault: limp mode, harsh or delayed shifts
- Often no symptoms if the fault was intermittent
- Simple OBD reader shows only P0700
Common causes of P0700
- Most likelyActual fault stored in the transmission module (sensor, solenoid, ratio, speed sensor)
- PossibleWrong transmission fluid level or condition causing slip or ratio codes
- PossibleHarness or connector at the transmission corroded or damaged
- Less likelyLow system voltage or weak battery
- Less likelyTransmission module or software faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Transmission control moduleEngine control moduleCAN bus
What each part of P0700 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 7 | Area: transmission. |
| 00 | The exact fault in that area. |
What to do next
- Note P0700 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0700
What does P0700 mean?
P0700 means "Transmission Control System (MIL Request)". P0700 is a notice code: the separate transmission control module has stored an emission-related fault of its own and asks the engine module to switch on the check engine light. It is a generic code, so it means the same on every make.
Is it safe to drive with P0700?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P0700 fail an emissions test?
Yes, it can. P0700 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0700 to fix?
Difficulty: medium. A typical repair takes 0.5 to 6 hours of work. This is a job for a workshop.
Will P0700 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.