Transmission Control System Malfunction
A request from the transmission control module (TCM) to illuminate the MIL. P0700 itself carries no specific information — it is a wrapper that tells the engine ECU "the TCM has a code". Read the TCM directly to find the actual transmission DTC.
Affected components
- Tcm
Common causes
- High likelihood: TCM has a sub-code that needs to be read separately
Possible symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Diagnostic notes
- The malfunction indicator lamp may illuminate
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.