P07EC
Transmission Range Multi-Function Select Circuit
General electrical fault on the multi-function transmission range select circuit — used on shift-by-wire systems with rotary or push-button selectors that encode P/R/N/D as a multi-bit pattern. With the input invalid the TCM cannot decode the operator request.
- 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.
- Open or shorted select wireCommon
Parts involved
- Range Select Switch
- Wiring Harness
P07EC 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.