P0725
Engine Speed Input Circuit
A general circuit fault on the engine speed signal that the TCM receives from the ECM. Without this signal the TCM cannot synchronise gear shifts to engine load.
- 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.
- Harness fault between ECM and TCMCommon
Parts involved
- Engine Speed Signal To TCM
P0725 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.