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Powertrain fault code

P0700: Transmission Control System (MIL Request)

Fix soon

The gearbox may go into limp mode (stuck in one gear). Drive gently and have it checked.

What P0700 means

The gearbox computer has stored a fault and asked the engine computer to switch on the warning light. The real code is in the gearbox module.

Common causes

  • Any transmission fault: read the gearbox module for the detail

What to check first

  1. Scan the transmission module for its own codes.
  2. Check the gearbox oil level if your car has a dipstick.

Get P0700 explained for your car: $2.99

  • P0700 explained in full for your make and model: meaning, how urgent, likely causes and what to check, in order.
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  • Your own private report page you can save as a PDF or show your mechanic.

Read your car's codes yourself, free

Plug a cheap ELM327 OBD-II adapter into the port under the dashboard and open the scan tool: Chrome or Edge on a computer with a USB adapter, or Chrome on Android with a Bluetooth LE adapter. It reads and clears codes and shows emissions readiness. It does not work on iPhone.

Open the free scan tool

Need help with P0700?

Tell us your car and what it is doing with P0700. We reply by email with what to check first, in plain words. Free.

General guidance only, not a diagnosis. A qualified mechanic should confirm the cause before you replace parts.