P07DC
Incorrect Shift from Gear 1
Starting from 1st gear, the TCM commanded a specific upshift but the resulting gear ratio matches a different gear. Wrong shift solenoid pattern actually engaged, or a stuck solenoid blocked the intended pattern.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
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.
- Stuck shift solenoidCommon
Parts involved
- Shift Solenoids
- Valve Body
P07DC 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.