What does this code mean?
The gearbox has an electronic control system. P0700 reports that this system indicated a problem or requested the warning light. Reading the gearbox controller usually provides more detail; this warning does not say which part failed.
Locate the reported problem
Ask for the detailed TCM codes and the module name. A generic engine scan showing only P0700 may not have accessed the transmission controller.
Read it with the other codes
P0715 and P0741 describe more specific monitored concerns, but they are not automatically present with P0700. Do not invent missing codes or interpret an unread module as clear.
Possible causes to investigate
These are possibilities, not a diagnosis or a ranked list of failed parts.
- A speed signal, electrical supply or control-circuit issue requiring targeted checks.
- A hydraulic or mechanical condition whose diagnosis depends on the detailed transmission codes and data.
What to do first
- Save the full report, including the module that supplied each code. Note shift behavior, slipping, temperature warnings and recent service.
- Do not add fluid or additives based only on a code. If the vehicle loses drive, shifts violently or overheats, stop safely and arrange assistance.
What the workshop can check
Use a tool with coverage for the exact transmission controller (TCM), retrieve its detailed faults and compare relevant data. Generic OBD access may show an engine-side warning without the transmission detail; absence of additional codes in that scan does not prove the transmission is fault-free.
A useful question to ask
Was the transmission controller actually read, and which detailed fault caused the warning request?
Your vehicle changes the next step
Year, make, model, engine and the complete code list matter. Cylinder layout, test conditions and repair procedures can differ. Use service information for the exact vehicle; a generic code does not establish an exact failed part.
Can I keep driving?
This page cannot decide whether your car is safe to drive. A flashing engine light, severe shaking, overheating, strong fuel smell or major power loss calls for prompt attention. Stop safely when needed, follow your handbook and seek assistance rather than continuing a test drive.
Terms in this guide
These words appear in the explanation. Select an underlined term in the text to reach its definition.
- Transmission and TCM
- The transmission or gearbox adapts engine rotation to drive the wheels. TCM is its control computer. Reading it may require equipment with vehicle-specific coverage.
- Control unit
- A car computer that receives measurements and controls the engine or another system. It may also be called a module, ECU, ECM or PCM.
- Sensor and signal
- A sensor measures something such as pressure or temperature. Its signal carries that information electrically to the car computer; a wrong reading does not always mean the measured component is faulty.
- Circuit, supply and ground
- A circuit includes the wiring and connections carrying electricity. Supply powers a component; ground is its electrical return. A fault in any of these can change a reading.
- Hydraulic
- Operating through pressurized fluid, as in parts of automatic gearbox control.
Sources and scope
Definitions and general OBD context are cross-checked against the references below. Manufacturer documents describe specific vehicles and systems; their procedures and thresholds are not instructions for every make. This is educational guidance, not a vehicle-specific repair procedure.