P0700
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.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
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
Common causes
Ordered by how often each turns out to be the cause.
- TCM has a sub-code that needs to be read separatelyCommon
Parts involved
- TCM
P0700 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.