P0700Transmission Control System (MIL Request)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- 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.
- What you may notice
- 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
- Likely causes
- 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
- RareLow system voltage or weak battery
- RareTransmission module or software faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.