P0780
Shift Malfunction
The TCM detects that a commanded shift between gears did not occur within the expected time and quality window. Slip rates or speed ratios remain implausible during shift.
- 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.
- Low or degraded transmission fluidCommon
- Shift solenoid stuck or wornCommon
- Clutch pack wearPossible
Parts involved
- Transmission Solenoid
- Transmission Clutch Pack
- Transmission Fluid
- Valve Body
P0780 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.